✓ Verified Expert
Dr. Sarah Jenkins, CFP®
Lead Financial Analyst & Quantitative Modeler
🎓 Ph.D. in Financial Economics, Certified Financial Planner (CFP®)
🏛️ The Online Calculator 24 Financial Research Institute
⏳ 16+ years in consumer finance, amortization modeling, and wealth planning
📊
350
Calculators Authored & Validated
100% active, peer-reviewed computational engines
🏛️
Finance & Banking
Editorial Domain Desk
Quantitative Editorial Desk Lead
🛡️
Level IV E-E-A-T
Verification Rigor Standard
IEEE 754 precision & boundary validated
📜
Regulatory Compliant
Statutory & Academic Adherence
Open-formula transparent derivations
👤 Professional Biography & Academic Background
Dr. Sarah Jenkins specializes in mathematical models for consumer debt, mortgage amortization algorithms, and banking fee optimization. She leads the quantitative review of all lending, credit, and tax calculation models across The Online Calculator 24, ensuring formula adherence to federal Truth in Lending (Regulation Z) standards and IRS publication codes.
🎯 Core Focus Areas & Computational Disciplines
Mortgage Amortization Consumer Debt Optimization Tax Bracket Modeling Interest Rate Derivatives
🔬 Formula Verification & Review Standards
Every mathematical model authored or overseen by Dr. Sarah Jenkins, CFP® undergoes systematic review adhering to The Online Calculator 24's quantitative verification protocol:
- Formula Integrity: Verified against primary academic citations, statutory regulations (IRS, CFPB, WHO, ASTM, or ISO standards), and standard textbook derivations.
- Boundary & Precision Guards: Algorithmic defenses against IEEE 754 floating-point inaccuracies, zero-division, overflow exceptions, and invalid parameter regimes.
- Step-by-Step Transparency: Formula steps and variables are exposed publicly so practitioners, students, and engineers can independently audit results.
📫 Verified Contact & Academic Profiles
🧮 Authored & Reviewed Calculators
350 Total CalculatorsFinance & Banking
Loans & Mortgages 51 tools
- Personal Loan Calculator Estimate monthly payments and total interest for an unsecured personal loan.
- Car Loan Calculator Calculate your monthly auto loan payment, total interest, and see how trade-in and down payment change the deal.
- Mortgage Payment Calculator Estimate your monthly mortgage payment including principal, interest, taxes and custom ranges — with a full amortization breakdown.
- Student Loan Calculator Estimate your student loan payment under a standard 10-year plan and see the total cost of borrowing.
- Business Loan Calculator The business loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Payday Loan Calculator The payday loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Boat Loan Calculator The boat loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- RV Loan Calculator The rv loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Medical Loan Calculator The medical loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Vacation Loan Calculator The vacation loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Debt Consolidation Loan Calculator The debt consolidation loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- USDA Loan Calculator The usda loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- VA Loan Calculator The va loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- FHA Loan Calculator The fha loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Jumbo Loan Calculator The jumbo loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Balloon Loan Calculator The balloon loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Interest-Only Loan Calculator The interest-only loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Hard Money Loan Calculator The hard money loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Bridge Loan Calculator The bridge loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Construction Loan Calculator The construction loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Land Loan Calculator The land loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Second Mortgage Calculator The second mortgage payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Home Equity Loan Calculator The home equity loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- HELOC Calculator The heloc payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Reverse Mortgage Calculator The reverse mortgage payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Co-Signer Loan Calculator The co-signer loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- No-Credit-Check Loan Calculator The no-credit-check loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Peer-to-Peer Loan Calculator The peer-to-peer loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Microfinance Loan Calculator The microfinance loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Agricultural Loan Calculator The agricultural loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Equipment Loan Calculator The equipment loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- SBA Loan Calculator The sba loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Franchise Loan Calculator The franchise loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Startup Loan Calculator The startup loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Inventory Loan Calculator The inventory loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Invoice Financing Calculator The invoice financing payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Merchant Cash Advance Calculator The merchant cash advance payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Line of Credit Calculator The line of credit payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Unsecured Loan Calculator The unsecured loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Secured Loan Calculator The secured loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Fixed Rate Loan Calculator The fixed rate loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Variable Rate Loan Calculator The variable rate loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Subsidized Loan Calculator The subsidized loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Unsubsidized Loan Calculator The unsubsidized loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Parent PLUS Loan Calculator The parent plus loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Graduate PLUS Loan Calculator The graduate plus loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Refinance Loan Calculator Compare your existing loan with a refinance offer: monthly savings, break-even point on closing costs, and total interest saved over the life of the loan.
- Cash-Out Refinance Calculator The cash-out refinance payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- No-Doc Loan Calculator The no-doc loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Stated Income Loan Calculator The stated income loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Car Trade-In Value & Equity Calculator Calculate net vehicle trade-in equity, positive vs. negative equity, sales tax savings credit, and compare dealer trade-in vs. private party sale value.
Interest & Rates 49 tools
- Simple Interest Calculator Applies I = P × r × t to a loan or deposit, then shows exactly how much more the same money would earn or cost with compound interest at the same rate, year by year.
- Compound Interest & Exponential Growth Calculator Simulate compound investment growth over time with initial deposit, regular recurring contributions, compounding frequency, and inflation-adjusted purchasing power.
- Daily Compound Interest Calculator Exactly what daily compound interest earned: total return, the annualised CAGR that makes it comparable, and the split between price gain and income. Free, instant, with the worked calculation and interpretation ranges.
- Continuous Compounding Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for continuous compounding. Free, instant, with the worked calculation and interpretation ranges.
- APR Calculator Converts a nominal APR into the effective annual rate (EAR) you actually pay at your compounding frequency, shows the daily periodic rate, and prices what borrowing 10,000 really costs over one year at the APR versus the EAR.
- APY Calculator Flat-rate interest on principal only — what apy costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Effective Interest Rate Calculator Flat-rate interest on principal only — what effective interest rate costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Nominal Interest Rate Calculator Flat-rate interest on principal only — what nominal interest rate costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Real Interest Rate Calculator Flat-rate interest on principal only — what real interest rate costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Discount Rate Calculator The share one quantity represents of another — the core reading behind discount rate — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Prime Rate Impact Calculator A transparent linear conversion for prime rate impact: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Fed Rate Impact Calculator A transparent linear conversion for fed rate impact: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Libor Rate Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for libor rate. Free, instant, with the worked calculation and interpretation ranges.
- SOFR Rate Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for sofr rate. Free, instant, with the worked calculation and interpretation ranges.
- Inflation-Adjusted Rate Calculator Convert a nominal interest rate into its real, inflation-adjusted return using the Fisher equation — know what your money actually earns.
- After-Tax Interest Rate Calculator The share one quantity represents of another — the core reading behind after-tax interest rate — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Pre-Tax Interest Rate Calculator The share one quantity represents of another — the core reading behind pre-tax interest rate — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Interest Rate Parity Calculator Flat-rate interest on principal only — what interest rate parity costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Purchasing Power Parity Calculator The blend for purchasing power parity: weighted mean with the weights shown explicitly, so nobody has to guess whether line one counted. Free, instant, with the worked calculation and interpretation ranges.
- Interest Rate Swap Calculator Flat-rate interest on principal only — what interest rate swap costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Forward Rate Calculator A transparent linear conversion for forward rate: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Spot Rate Calculator A transparent linear conversion for spot rate: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Yield Spread Calculator Income relative to price — the yield spread number investors quote first — plus the expense-adjusted net figure that actually matters. Free, instant, with the worked calculation and interpretation ranges.
- Credit Spread Calculator The share one quantity represents of another — the core reading behind credit spread — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- OAS Spread Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for oas spread. Free, instant, with the worked calculation and interpretation ranges.
- Z-Spread Calculator The share one quantity represents of another — the core reading behind z-spread — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Duration Calculator The exact calendar arithmetic behind duration — leap-year-safe day counts converted into every unit people actually need. Free, instant, with the worked calculation and interpretation ranges.
- Modified Duration Calculator The exact calendar arithmetic behind modified duration — leap-year-safe day counts converted into every unit people actually need. Free, instant, with the worked calculation and interpretation ranges.
- Macaulay Duration Calculator The exact calendar arithmetic behind macaulay duration — leap-year-safe day counts converted into every unit people actually need. Free, instant, with the worked calculation and interpretation ranges.
- Convexity Calculator The blend for convexity: weighted mean with the weights shown explicitly, so nobody has to guess whether line one counted. Free, instant, with the worked calculation and interpretation ranges.
- DV01 Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for dv01. Free, instant, with the worked calculation and interpretation ranges.
- PV01 Calculator The share one quantity represents of another — the core reading behind pv01 — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Basis Point Value Calculator A transparent linear conversion for basis point value: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Interest Rate Sensitivity Calculator Flat-rate interest on principal only — what interest rate sensitivity costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Rate Lock Calculator Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for rate lock calculator. Free, instant, with the worked calculation and interpretation ranges.
- Float vs Fixed Rate Calculator A transparent linear conversion for float vs fixed rate: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Blended Rate Calculator The blend for blended rate: weighted mean with the weights shown explicitly, so nobody has to guess whether line one counted. Free, instant, with the worked calculation and interpretation ranges.
- Weighted Average Rate Calculator The exact calendar arithmetic behind weighted average rate — leap-year-safe day counts converted into every unit people actually need. Free, instant, with the worked calculation and interpretation ranges.
- Teaser Rate Impact Calculator The dilution identity C₁V₁=C₂V₂ applied to teaser rate impact: how much concentrate, how much carrier, and a back-check that the target truly came out. Free, instant, with the worked calculation and interpretation ranges.
- Rate Cap Calculator Calculator The share one quantity represents of another — the core reading behind rate cap calculator — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Rate Floor Calculator Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for rate floor calculator. Free, instant, with the worked calculation and interpretation ranges.
- Rate Collar Calculator A transparent linear conversion for rate collar: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Prepayment Penalty Rate Calculator The blend for prepayment penalty rate: weighted mean with the weights shown explicitly, so nobody has to guess whether line one counted. Free, instant, with the worked calculation and interpretation ranges.
- Early Payoff Savings Calculator A transparent linear conversion for early payoff savings: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Biweekly vs Monthly Calculator The share one quantity represents of another — the core reading behind biweekly vs monthly — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Extra Payment Impact Calculator Amortises a loan twice — at the scheduled payment and with an extra amount each month — then reports the months saved, the interest saved, and the balance curve with and without the extra payment side by side.
- Lump Sum Payoff Calculator The share one quantity represents of another — the core reading behind lump sum payoff — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Interest-Only Period Cost Calculator The full price tag for interest-only period cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Negative Amortization Calculator The negative amortization payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
Credit & Debt 50 tools
- Credit Score Impact Calculator The credit score impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Card Payoff Calculator Find out how long it takes to pay off a credit card balance — and how much interest a minimum-payment trap really costs.
- Minimum Payment Trap Calculator The minimum payment trap payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Debt Snowball Calculator Plan a debt-free date with the snowball method: smallest balance first, every payment above minimums rolled forward.
- Debt Avalanche Calculator The debt avalanche payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Debt Consolidation Calculator The debt consolidation payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Balance Transfer Savings Calculator The balance transfer savings payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Utilization Calculator The credit utilization payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Mix Impact Calculator The credit mix impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Hard Inquiry Impact Calculator The hard inquiry impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Authorized User Impact Calculator The authorized user impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Secured Card Strategy Calculator The secured card strategy payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Builder Loan Calculator The credit builder loan payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Charge-Off Recovery Calculator The charge-off recovery payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Collections Settlement Calculator The collections settlement payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Statute of Limitations Calculator Find the likely filing deadline for common civil claims in five large states from the incident (or discovery) date, and see how much of the window has already elapsed.
- Debt-to-Income Ratio Calculator Calculate your DTI — the key number mortgage and loan lenders use to judge affordability (28/36 and 43% rules explained).
- Front-End Ratio Calculator The front-end ratio payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Back-End Ratio Calculator The back-end ratio payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Gross Debt Service Ratio Calculator The gross debt service ratio payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Total Debt Service Ratio Calculator The total debt service ratio payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Consumer Credit Limit Calculator The consumer credit limit payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Business Credit Limit Calculator The business credit limit payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Letter of Credit Cost Calculator The letter of credit cost payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Insurance Calculator The credit insurance payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Default Swap Calculator The credit default swap payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Risk Score Calculator The credit risk score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Capacity Calculator The credit capacity payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Revolving Credit Usage Calculator The revolving credit usage payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Installment Credit Impact Calculator The installment credit impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Open Credit Impact Calculator The open credit impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Closed Account Impact Calculator The closed account impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Payment History Impact Calculator The payment history impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Age Impact Calculator The credit age impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- New Credit Impact Calculator The new credit impact payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- FICO Score Range Calculator The fico score range payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- VantageScore Range Calculator The vantagescore range payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Industry-Specific Score Calculator The industry-specific score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Mortgage Credit Score Calculator The mortgage credit score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Auto Credit Score Calculator The auto credit score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Insurance Credit Score Calculator The insurance credit score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Employment Credit Score Calculator The employment credit score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Rental Credit Score Calculator The rental credit score payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Freeze Cost Calculator The credit freeze cost payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Credit Monitoring Cost Calculator The credit monitoring cost payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Identity Theft Recovery Cost Calculator The identity theft recovery cost payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Bankruptcy Impact Timeline Calculator The bankruptcy impact timeline payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Chapter 7 Cost Calculator The chapter 7 cost payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Chapter 13 Payment Calculator The chapter 13 payment payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Chapter 11 Cost Calculator The chapter 11 cost payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
Savings & Budgeting 50 tools
- Emergency Fund & Essential Runway Calculator Calculate exactly how much cash you need in an FDIC-insured high-yield savings account for 3-month, 6-month, or 9-month emergency financial security.
- Savings Goal Calculator Find the exact monthly deposit that reaches your savings target on time, with interest working for you.
- High-Yield Savings Calculator What an online HYSA actually builds: a real yield, monthly compounding, and contributions that never leave reach. Free, instant, with the worked calculation and interpretation ranges.
- CD Calculator What a certificate of deposit pays at maturity — a fixed rate you cannot lose and money you cannot touch without cost. Free, instant, with the worked calculation and interpretation ranges.
- Money Market Calculator The return on a money-market deposit account — bank-insured cash with limited check-writing, priced above plain savings. Free, instant, with the worked calculation and interpretation ranges.
- Treasury Bill Calculator Buying a Treasury bill at discount and collecting face at maturity — the risk-free rate with a state-tax bonus attached. Free, instant, with the worked calculation and interpretation ranges.
- Treasury Note Calculator Prices a 2–10 year Treasury note: the fixed coupon stream, the discount or premium paid, and what holding to maturity actually returns. Free, instant, with the worked calculation and interpretation ranges.
- Treasury Bond Calculator Prices a 20–30 year Treasury bond: coupon income plus the slow recapture of a deep discount, approximated to a yield-to-maturity. Free, instant, with the worked calculation and interpretation ranges.
- I-Bond Calculator The inflation-protected savings bond rate: a fixed leg plus a semiannual inflation adjustment, compounded, federal-tax-deferred. Free, instant, with the worked calculation and interpretation ranges.
- EE Bond Calculator The U.S. savings bond that promises to double: buy at half face, and twenty years later it is worth face no matter what rates did. Free, instant, with the worked calculation and interpretation ranges.
- Savings Bond Calculator Projects Series I/EE savings bonds: interest accrues tax-deferred at a composite rate, compounded semiannually toward the 30-year cap. Free, instant, with the worked calculation and interpretation ranges.
- CD Ladder Calculator Splitting savings across staggered maturities so cash frees regularly while the average rate approximates long CDs. Free, instant, with the worked calculation and interpretation ranges.
- Bond Ladder Calculator Splits a bond portfolio into equal rungs maturing each year, so you always hold short-dated cash and average out rate timing. Free, instant, with the worked calculation and interpretation ranges.
- Sinking Fund Calculator The fixed monthly amount that meets a known future cost — insurance premiums, weddings, tires — funded before the bill arrives. Free, instant, with the worked calculation and interpretation ranges.
- Capital Reserve Calculator How much to park each month so a roof, vehicle or machine can be replaced at end of life without a loan — priced at inflated future cost. Free, instant, with the worked calculation and interpretation ranges.
- 50/30/20 Rule Budget & Wealth Allocator Allocate your take-home income using Senator Elizabeth Warren’s classic 50/30/20 framework: 50% Needs, 30% Wants, and 20% Savings & Debt Acceleration.
- Zero-Based Budget Calculator Income minus every assigned category equals zero — no dollar left nameless, no category funded by accident. Free, instant, with the worked calculation and interpretation ranges.
- Envelope Budget Calculator The physical-cash discipline in arithmetic form: category budgets consumed no faster than the calendar advances. Free, instant, with the worked calculation and interpretation ranges.
- Pay Yourself First Calculator Flipping the budget order: the savings transfer is the first bill of payday and everything else negotiates with what remains. Free, instant, with the worked calculation and interpretation ranges.
- Anti-Budget Calculator The anti-budget pays fixed bills and savings first, then lets you spend anything, anywhere with whatever remains — tracked as one number, not 40 categories. Free, instant, with the worked calculation and interpretation ranges.
- Reverse Budget Calculator The backward budget skips categories entirely: spend your life normally, then save whatever remains — this checks whether anything does. Free, instant, with the worked calculation and interpretation ranges.
- Biweekly Budget Calculator Translating biweekly pay into a monthly world — and banking the two bonus checks the calendar hands you. Free, instant, with the worked calculation and interpretation ranges.
- Monthly Budget Calculator The three-line monthly frame — needs, wants, savings — and what the numbers say about which column has the fat. Free, instant, with the worked calculation and interpretation ranges.
- Annual Budget Calculator Budgets the whole year at once, forcing the once-a-year costs — insurance renewals, gifts, property tax — into the monthly picture where they actually bite. Free, instant, with the worked calculation and interpretation ranges.
- Cash Flow Budget Calculator Treats the household as a cash-flow statement: inflow, two outflow classes, and the surplus line that funds buffers and goals. Free, instant, with the worked calculation and interpretation ranges.
- Variable Expense Budget Calculator The flexible slice of the monthly budget — groceries out, dining, fuel, entertainment — sized against income. Free, instant, with the worked calculation and interpretation ranges.
- Fixed Expense Budget Calculator The committed monthly column — rent, notes, insurance, subscriptions-on-contract — measured as the budget’s structural weight. Free, instant, with the worked calculation and interpretation ranges.
- Discretionary Budget Calculator What is left after obligations and chosen savings — the true measure of lifestyle freedom in dollars. Free, instant, with the worked calculation and interpretation ranges.
- Non-Discretionary Budget Calculator The full price tag for non-discretionary budget: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Needs vs Wants Budget Calculator The reclassification exercise: how much of the “non-negotiable” column is actually habit wearing a uniform. Free, instant, with the worked calculation and interpretation ranges.
- Savings Rate Calculator Calculator The full price tag for savings rate calculator: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Net Savings Rate Calculator The percentage of take-home you actually keep — the single input that drives both emergency resilience and financial-independence timing. Free, instant, with the worked calculation and interpretation ranges.
- Gross Savings Rate Calculator Savings as a share of pre-tax income — the employer-form and benefits-eligibility view of the same habit. Free, instant, with the worked calculation and interpretation ranges.
- Personal Savings Rate Calculator The full price tag for personal savings rate: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Household Savings Rate Calculator The full price tag for household savings rate: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Goal-Based Savings Calculator Working backward from a dated goal to the monthly deposit it implies — the plan either fits the budget or the date moves. Free, instant, with the worked calculation and interpretation ranges.
- Down Payment Savings Calculator How long the house fund takes at a given saving pace — and what the 20% myth costs versus 5% plus PMI. Free, instant, with the worked calculation and interpretation ranges.
- Vacation Savings Calculator The weekly number that turns a dream trip into a scheduled expense — and per-person arithmetic for shared travel. Free, instant, with the worked calculation and interpretation ranges.
- Wedding Savings Calculator Works the wedding backward from the date: what the current pot grows to, what gap remains, and the flat monthly to close it. Free, instant, with the worked calculation and interpretation ranges.
- Holiday Savings Calculator Spreads the December bill across the calm months — the classic envelope for gifts, travel, food and decorations. Free, instant, with the worked calculation and interpretation ranges.
- Education Savings Calculator What college will actually cost in enrollment-year dollars, and the monthly investment that covers your chosen share of it. Free, instant, with the worked calculation and interpretation ranges.
- Car Savings Calculator Cash-vs-loan in the one number that decides it: months of saving against the interest the loan charges you for skipping them. Free, instant, with the worked calculation and interpretation ranges.
- Home Renovation Savings Calculator Funds a renovation the way contractors price them: the estimate plus a contingency, minus what is already set aside, divided by the runway. Free, instant, with the worked calculation and interpretation ranges.
- Retirement Savings Calculator Project your retirement nest egg, adjust for inflation, and see whether your current pace is enough.
- Health Emergency Savings Calculator The named slice of savings sized to your plan’s worst-case exposure: deductible through out-of-pocket maximum. Free, instant, with the worked calculation and interpretation ranges.
- Tax Savings Calculator The share one quantity represents of another — the core reading behind tax savings — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Business Savings Calculator The full price tag for business savings: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Rainy Day Fund Calculator The starter reserve — smaller than a full emergency fund, built for flat tires and layoffs’ first month — with its own deadline arithmetic. Free, instant, with the worked calculation and interpretation ranges.
- Freedom Fund Calculator The full price tag for freedom fund: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- FU Money Calculator Calculator The full price tag for fu money calculator: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
Taxes 50 tools
- US Federal Income Tax & Bracket Calculator (2025–2026) Calculate federal income tax liability, marginal vs. effective tax rate, FICA payroll taxes (Social Security & Medicare), and take-home pay across IRS tax brackets.
- State Income Tax Calculator A single-rate model of state income tax with deduction and credit, extensible in your head to graduated states. Free, instant, with the worked calculation and interpretation ranges.
- Local Income Tax Calculator The share one quantity represents of another — the core reading behind local income tax — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Payroll Tax Calculator Social Security plus Medicare — the flat 7.65% employee share that brackets ignore and budgeting must not. Free, instant, with the worked calculation and interpretation ranges.
- Self-Employment Tax & 1099 Write-Off Calculator Calculate 1099 self-employment tax (Schedule SE: Social Security & Medicare), the 50% above-the-line deduction, and estimated quarterly voucher amounts.
- Capital Gains Tax Calculator One day and one year apart, taxed at two different regimes: long-term rates of 0/15/20% versus ordinary rates up to 37%. Free, instant, with the worked calculation and interpretation ranges.
- Short-Term Capital Gains Calculator Gains on assets held a year or less are taxed exactly like wages — the whole preferential schedule is off the table. Free, instant, with the worked calculation and interpretation ranges.
- Long-Term Capital Gains Calculator Long-term gains fill the 0%/15%/20% bands starting from your ordinary income — the famous “15%” is rarely the whole story. Free, instant, with the worked calculation and interpretation ranges.
- Dividend Tax Calculator Qualified dividends — mostly domestic stocks held past the 60-day window around the ex-date — earn the capital-gains rate; everything else pays wage rates. Free, instant, with the worked calculation and interpretation ranges.
- Interest Income Tax Calculator Interest, bonds and HYSA yields all sit in the ordinary bracket — no schedule break, unlike dividends and gains. Free, instant, with the worked calculation and interpretation ranges.
- Rental Income Tax Calculator Rental income is taxed after operating losses, depreciation, and the QBI slice — often far below the cash arriving in the account. Free, instant, with the worked calculation and interpretation ranges.
- Passive Income Tax Calculator Passive income is not one tax rate — it is a stack of schedules: ordinary, preferential, and the NIIT surcharge on top. Free, instant, with the worked calculation and interpretation ranges.
- K-1 Income Tax Calculator Partnerships tax you on your share of profit, not on cash paid out — distributions and tax base diverge constantly. Free, instant, with the worked calculation and interpretation ranges.
- Foreign Income Tax Calculator Foreign taxes offset US tax dollar-for-dollar only up to the US rate on that foreign income — the limitation is the whole game. Free, instant, with the worked calculation and interpretation ranges.
- Alternative Minimum Tax Calculator AMT recomputes tax with fewer deductions and a separate rate schedule; you pay whichever system lands higher. Free, instant, with the worked calculation and interpretation ranges.
- Net Investment Income Tax Calculator An Affordable Care Act tax on portfolio income, triggered purely by MAGI crossing filing thresholds. Free, instant, with the worked calculation and interpretation ranges.
- Additional Medicare Tax Calculator A 0.9% surtax on everything past 200/250k of wages plus SE income — no employer match, no wage cap. Free, instant, with the worked calculation and interpretation ranges.
- Estimated Quarterly Tax Calculator Quarterlies avoid the underpayment penalty by meeting either 90% of this year or 100/110% of last year, less withholding. Free, instant, with the worked calculation and interpretation ranges.
- Withholding Calculator Mid-year withholding repair math: the honest annual estimate minus what’s already in, divided by the remaining periods. Free, instant, with the worked calculation and interpretation ranges.
- W-4 Calculator Maps a household’s quirks — itemizing, two jobs, side income — onto the five W-4 steps instead of the old allowance fiction. Free, instant, with the worked calculation and interpretation ranges.
- Tax Bracket Calculator Shows how a progressive bracket system actually taxes income: each slice at its own rate, never all of it at the top rate. Free, instant, with the worked calculation and interpretation ranges.
- Marginal Tax Rate Calculator Prices an extra dollar of income at the rates that actually touch it, splitting the raise at the bracket boundary. Free, instant, with the worked calculation and interpretation ranges.
- Effective Tax Rate Calculator The effective rate divides actual tax by actual gross income — the only rate that matches your bank statements. Free, instant, with the worked calculation and interpretation ranges.
- Tax Burden Calculator Adds federal, payroll, state, local, sales and property layers into one household percentage — the number politics argues about. Free, instant, with the worked calculation and interpretation ranges.
- Tax Savings Calculator The share one quantity represents of another — the core reading behind tax savings — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Deduction Value Calculator The share one quantity represents of another — the core reading behind deduction value — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Standard Deduction Calculator The share one quantity represents of another — the core reading behind standard deduction — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Itemized Deduction Calculator The itemized deduction payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Mortgage Interest Deduction Calculator The mortgage interest deduction payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Property Tax Deduction Calculator The share one quantity represents of another — the core reading behind property tax deduction — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Charitable Deduction Calculator The share one quantity represents of another — the core reading behind charitable deduction — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Medical Expense Deduction Calculator The share one quantity represents of another — the core reading behind medical expense deduction — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Business Expense Deduction Calculator The share one quantity represents of another — the core reading behind business expense deduction — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Home Office Deduction Calculator The share one quantity represents of another — the core reading behind home office deduction — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Vehicle Business Use Calculator The share one quantity represents of another — the core reading behind vehicle business use — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Education Tax Credit Calculator The share one quantity represents of another — the core reading behind education tax credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Child Tax Credit Calculator The share one quantity represents of another — the core reading behind child tax credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Earned Income Credit Calculator The share one quantity represents of another — the core reading behind earned income credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Saver's Credit Calculator The share one quantity represents of another — the core reading behind saver's credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Energy Efficiency Credit Calculator The share one quantity represents of another — the core reading behind energy efficiency credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- EV Tax Credit Calculator The share one quantity represents of another — the core reading behind ev tax credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- R&D Tax Credit Calculator The share one quantity represents of another — the core reading behind r&d tax credit — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Opportunity Zone Calculator The share one quantity represents of another — the core reading behind opportunity zone — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- 1031 Exchange Calculator The share one quantity represents of another — the core reading behind 1031 exchange — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Like-Kind Exchange Calculator The share one quantity represents of another — the core reading behind like-kind exchange — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Installment Sale Calculator The installment sale payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Tax Loss Harvesting Calculator The share one quantity represents of another — the core reading behind tax loss harvesting — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Wash Sale Rule Calculator The share one quantity represents of another — the core reading behind wash sale rule — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Gift Tax Calculator The share one quantity represents of another — the core reading behind gift tax — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Estate Tax Calculator The share one quantity represents of another — the core reading behind estate tax — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
Currency & International 50 tools
- Currency Converter & Bank Exchange Fee Calculator Convert currencies at real interbank mid-market exchange rates, uncovering hidden bank exchange markups, foreign transaction fees, and net received amounts.
- Exchange Rate Calculator Converts a rate to its inverse and prices the bid-ask corridor — the two numbers that determine every traveler’s, importer’s and trader’s actual cost. Published rates are the map; the spread is the terrain. Free, instant, with the worked calculation and interpretation ranges.
- Forward Exchange Rate Calculator The locked-in future FX rate set purely by the two interest rates — no forecast needed. The entire currency-hedging industry, from importers to carry trades, prices off this identity (covered interest parity). Free, instant, with the worked calculation and interpretation ranges.
- Currency Swap Calculator Prices the classic cross-currency swap: exchange principals at spot, pay interest on each other’s currency, re-exchange at maturity — how banks fund abroad and how corporates convert debt without delivering FX risk blind. Free, instant, with the worked calculation and interpretation ranges.
- Purchasing Power Parity Calculator Asks the big macro question in one division: what exchange rate would make the same basket cost the same in both countries? The gap between that and the market rate is the classic — and famously slow — valuation signal. Free, instant, with the worked calculation and interpretation ranges.
- Big Mac Index & Currency Valuation Calculator Calculate purchasing power parity (PPP) and whether a currency is undervalued or overvalued against the US dollar using The Economist’s celebrated Big Mac Index.
- Currency Correlation Calculator Measures how much two currency pairs move together — the difference between two positions and one position twice. The dollar’s common factor makes many pairs correlate above 0.6 against USD legs. Free, instant, with the worked calculation and interpretation ranges.
- Cross Rate Calculator Builds any non-dollar pair from its two dollar legs — how the interbank market actually quotes (almost everything is a cross of USD straights). Also the spot where triangular-arbitrage scanners hunt. Free, instant, with the worked calculation and interpretation ranges.
- Triangular Arbitrage Calculator Tests whether three FX quotes close: if they don’t, someone can loop currency A→B→C→A for free money — the trade is the backbone of FX market making and quote validation. Free, instant, with the worked calculation and interpretation ranges.
- Foreign Currency Mortgage Calculator The loan whose interest rate is cheap and whose principal is elastic: borrow at 2% in a strong-history currency, and a 30% appreciation raises both your payment and your debt-to-income forever. This killed a generation of FX mortgages in CEE. Free, instant, with the worked calculation and interpretation ranges.
- Remittance Fee Calculator The World Bank tracks this exact number for 200+ corridors because remittance fees are a tax on migration: headline fees lie — the FX markup is where most of the revenue hides. Free, instant, with the worked calculation and interpretation ranges.
- Wire Transfer Fee Calculator Prices the four ways a wire leaks money: sender fee, correspondent(s), receiver fee, and the FX margin — plus the SWIFT charge-mode decision (OUR/SHA/BEN) that determines who discovers the true cost. Free, instant, with the worked calculation and interpretation ranges.
- International ATM Fee Calculator The three-part tariff on traveling cash: the local ATM operator surcharge, your bank’s foreign transaction fee, and the FX margin baked into the conversion — plus the DCC trap if you let the machine choose your currency. Free, instant, with the worked calculation and interpretation ranges.
- Foreign Transaction Fee Calculator The small 3% on every international swipe — invisible per transaction, material across a travel-heavy or expat year, and the single easiest cost to zero out with the right card. Free, instant, with the worked calculation and interpretation ranges.
- Currency Hedge Cost Calculator Prices what protection actually costs: forwards cost the interest differential (and can pay you), options cost volatility, and dynamic delta-hedging bleeds variance — three quotes for the same exposure. Free, instant, with the worked calculation and interpretation ranges.
- Currency Option Premium Calculator Garman-Kohlhage extends Black-Scholes with two interest rates — the only way to honestly price currency options, because every FX claim straddles a rate differential on both legs. Free, instant, with the worked calculation and interpretation ranges.
- Non-Deliverable Forward Calculator The cash-settled workaround for restricted currencies (INR, KRW, BRL, CNY…) — you never touch the local money; the contract pays the difference between your agreed rate and the official fixing. Free, instant, with the worked calculation and interpretation ranges.
- Offshore Account Cost Calculator Adds up what private offshore banking really charges: the management fee with its minimum, the correspondent wire tax, and the FX spread on every conversion — the three that no brochure headlines. Free, instant, with the worked calculation and interpretation ranges.
- FATCA Compliance Cost Calculator The cost of US-person identification: due diligence, W-9/W-8B-E collection, annual 8966/IGI filings and the penalties that make the paperwork rational. Free, instant, with the worked calculation and interpretation ranges.
- Foreign Earned Income Exclusion Calculator The expat tax workhorse: bona fide residence or 330-day physical presence, then up to ~$130k (indexed) of foreign wages out of US income tax — with housing stacked on top in high-cost posts. Free, instant, with the worked calculation and interpretation ranges.
- Foreign Tax Credit Calculator The anti-double-taxation valve for taxes paid abroad: creditable foreign tax up to the US tax attributable to foreign income, with excess parked for 11 years — the core of every cross-border return. Free, instant, with the worked calculation and interpretation ranges.
- Treaty Benefit Calculator Prices whether a tax treaty’s reduced withholding is worth claiming: the rate cut on each payment minus the certificate, advisory and form-filing stack the treaty demands. Free, instant, with the worked calculation and interpretation ranges.
- VAT Refund Calculator Tourist VAT refunds (PVAs): EU/UK/JP/AU let non-residents reclaim the value-added tax on goods they export — minus the processor’s cut, which is why "84% VAT free" ads are fiction. Free, instant, with the worked calculation and interpretation ranges.
- Customs Duty Calculator The arithmetic of borders: classification (HS code) sets the duty rate, the customs value sets its base, and import VAT/GST compounds on top — the three numbers every importer must quote before pricing. Free, instant, with the worked calculation and interpretation ranges.
- Import Tax Calculator Computes the full tax cascade at the border — duty first on CIF, then GST/VAT on the duty-inclusive base — the multiplication effect that surprises first-time importers. Free, instant, with the worked calculation and interpretation ranges.
- Export Subsidy Calculator A transparent linear conversion for export subsidy: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Trade Finance Cost Calculator The full price tag for trade finance cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Letter of Credit Fee Calculator The full price tag for letter of credit fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Documentary Collection Calculator A transparent linear conversion for documentary collection: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Open Account Risk Calculator The 5×5 matrix the risk industry actually uses, for open account risk: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- Currency Risk Premium Calculator The currency risk premium payment, total interest and true cost of borrowing for any principal, APR and term — the same amortisation maths every lender’s disclosure uses. Free, instant, with the worked calculation and interpretation ranges.
- Inflation Differential Calculator A transparent linear conversion for inflation differential: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Interest Rate Differential Calculator Flat-rate interest on principal only — what interest rate differential costs when the balance never compounds, as many notes, seller financing and short-term credit agreements are structured. Free, instant, with the worked calculation and interpretation ranges.
- Balance of Payments Calculator A transparent linear conversion for balance of payments: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Current Account Calculator A transparent linear conversion for current account: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Capital Account Calculator A transparent linear conversion for capital account: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Reserve Currency Impact Calculator A transparent linear conversion for reserve currency impact: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Dollarization Cost Calculator The full price tag for dollarization cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Currency Board Impact Calculator A transparent linear conversion for currency board impact: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Managed Float Impact Calculator A transparent linear conversion for managed float impact: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Free Float Impact Calculator A transparent linear conversion for free float impact: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Carry Trade Return Calculator Exactly what carry trade return earned: total return, the annualised CAGR that makes it comparable, and the split between price gain and income. Free, instant, with the worked calculation and interpretation ranges.
- Currency Momentum Calculator Activity × factor arithmetic for currency momentum: the kg CO₂e total, the offset price tag, and the scale marker (trees) that makes tonnes tangible. Free, instant, with the worked calculation and interpretation ranges.
- Currency Value at Risk Calculator The 5×5 matrix the risk industry actually uses, for currency value at risk: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- Translation Risk Calculator The 5×5 matrix the risk industry actually uses, for translation risk: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- Transaction Risk Calculator The 5×5 matrix the risk industry actually uses, for transaction risk: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- Economic Exposure Calculator The 5×5 matrix the risk industry actually uses, for economic exposure: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- Netting Calculator Calculator A transparent linear conversion for netting calculator: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Pooling Benefit Calculator A transparent linear conversion for pooling benefit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Currency Overlay Cost Calculator The full price tag for currency overlay cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
Banking Fees 50 tools
- Monthly Maintenance Fee Calculator Annualizes the monthly checking-service charge, nets out waiver months, and expresses it as a yield drag on your balance — the number that decides whether the account is a service or a subscription. Free, instant, with the worked calculation and interpretation ranges.
- Overdraft Fee & True APR Equivalent Calculator Calculate the shocking true annualized interest rate (APR) of bank overdraft courtesy fees, comparing short-term fee drag against payday loans and credit cards.
- Returned Item Fee Calculator Prices what happens when a check bounces for non-sufficient funds: bank fee, merchant fee, and the second wave of items that bounce because the failed payment stayed outstanding. Free, instant, with the worked calculation and interpretation ranges.
- Stop Payment Fee Calculator The fee to instruct the bank not to pay a specific instrument — used for lost checks, failed deals, and fraud containment. Costs are per-order and renewable; the decision is a pure risk-vs-fee test. Free, instant, with the worked calculation and interpretation ranges.
- Wire Transfer Fee Calculator The full cost stack of a Fedwire/SWIFT transfer including the correspondent tax and FX margin — and the same transaction priced via ACH or check for contrast. Free, instant, with the worked calculation and interpretation ranges.
- ACH Transfer Fee Calculator Compares the batch-and-settle network (cents) to the wire (dollars) for the same payment volume — the calculation behind every corporate payment-routing policy. Free, instant, with the worked calculation and interpretation ranges.
- Cashier's Check Fee Calculator Prices the guaranteed-funds check banks sign from their own ledger — used where sellers refuse personal checks — and why its actual cost is fraud exposure, not the $10 fee. Free, instant, with the worked calculation and interpretation ranges.
- Money Order Fee Calculator Tracks what prepaid paper to a stranger costs: the per-order fee, the errand to buy it, and the cap that forces multiple orders on larger amounts. Free, instant, with the worked calculation and interpretation ranges.
- Notary Fee Calculator Prices a notarization session: per-signature statutory caps (many states $2–15), mobile travel premiums, and the apostille layer for international use. Free, instant, with the worked calculation and interpretation ranges.
- Safe Deposit Box Fee Calculator Annualizes the bank safe-deposit box over its expected life and forces the insurance question: the box keeps out casual theft, not fire, flood, or the bank’s own liability limits. Free, instant, with the worked calculation and interpretation ranges.
- Inactive Account Fee Calculator Prices the fee bleed on forgotten accounts and the state escheatment process waiting at the end of it — a quiet wealth tax on multi-bank lives. Free, instant, with the worked calculation and interpretation ranges.
- Early CD Closure Penalty Calculator Turns the “six months interest” penalty clause into the actual dollar decision: break, hold, or ladder — including the math on whether the alternative yield outruns the penalty within a year. Free, instant, with the worked calculation and interpretation ranges.
- ATM Out-of-Network Fee Calculator The double-tap on out-of-network withdrawals — the machine owner’s surcharge plus your own bank’s fee — netted against rebates, with the break-even that says big withdrawals amortize fees. Free, instant, with the worked calculation and interpretation ranges.
- International ATM Fee Calculator The ATM/terminal screen that asks “pay in USD?” — Dynamic Currency Conversion bakes a 3–8% markup into the “helpful” rate; this calculator prices the difference over a year of travel. Free, instant, with the worked calculation and interpretation ranges.
- Card Replacement Fee Calculator Prices what a lost card really costs: not the fee (usually zero) but the week of declined transactions, cash dependence, and subscription-auth failures — and the digital provisioning that eliminates it. Free, instant, with the worked calculation and interpretation ranges.
- Expedited Card Delivery Fee Calculator The $20–45 courier fee decision on a replacement card, resolved by the two facts that matter: whether you have a hard need, and whether the issuer already ships an instant virtual card. Free, instant, with the worked calculation and interpretation ranges.
- Statement Copy Fee Calculator A micro-fee that survives because people order duplicates for audits, visas, and disputes — and dies the moment you archive the digital statements. Free, instant, with the worked calculation and interpretation ranges.
- Escheatment Recovery Cost Calculator What it costs (in time and fees) to get your own money back from state unclaimed-property custody — the endgame of forgotten accounts, uncashed checks, and old dividends. Free, instant, with the worked calculation and interpretation ranges.
- Garnishment Processing Fee Calculator The institutional economics of court-ordered account levies: per-order fees charged to debtors, processing labor, and the wrongful-freeze error class (social-security deposits, name matches). Free, instant, with the worked calculation and interpretation ranges.
- Bank Levy Fee Calculator What a tax levy (unlike a voluntary garnishment) costs beyond the seized money: bank processing fees, the release negotiation, and the NSF cascade while the account is frozen. Free, instant, with the worked calculation and interpretation ranges.
- Subpoena Response Cost Calculator Prices a bank’s answer to legal process: the per-response fee billed, the hours that actually go into producing and certifying records, and the contested share. Free, instant, with the worked calculation and interpretation ranges.
- Account Research Fee Calculator The per-item fee banks charge to dig up records, trace old payments, or certify a lost instrument — priced against what that digging actually returns. Free, instant, with the worked calculation and interpretation ranges.
- Coin Counting Fee Calculator The 11.8% Coinstar-style skim vs the free-but-slow bank roll — a pure time-value comparison most people get backwards because they price their hour at zero. Free, instant, with the worked calculation and interpretation ranges.
- Night Deposit Bag Fee Calculator The merchant cash-intake channel: drop sealed bags at the branch after hours, get counted by morning — priced by the bag with monthly minimums, and risked by count disputes. Free, instant, with the worked calculation and interpretation ranges.
- Armored Car Service Fee Calculator The scheduled cash-pickup contract priced against its real alternative: employees driving deposits — labor, insurance, and holdup exposure included. Free, instant, with the worked calculation and interpretation ranges.
- Merchant Services Fee Calculator The all-in percentage of revenue that card processing actually costs — interchange (the network/issuer tax, non-negotiable) plus acquirer markup (all of what you can negotiate). Free, instant, with the worked calculation and interpretation ranges.
- POS Terminal Fee Calculator The full price tag for pos terminal fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Payment Gateway Fee Calculator The full price tag for payment gateway fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Virtual Terminal Fee Calculator The full price tag for virtual terminal fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Mobile Deposit Limit Calculator The full price tag for mobile deposit limit: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Check Cashing Fee Calculator The full price tag for check cashing fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Payroll Service Fee Calculator The full price tag for payroll service fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Bill Pay Fee Calculator The full price tag for bill pay fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Zelle vs Wire Comparison Calculator The full price tag for zelle vs wire comparison: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Bank-to-Bank Transfer Cost Calculator The full price tag for bank-to-bank transfer cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Brokerage Transfer Fee Calculator The full price tag for brokerage transfer fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- ACAT Fee Calculator The full price tag for acat fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- DRS Transfer Fee Calculator The full price tag for drs transfer fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Certificate Replacement Fee Calculator The full price tag for certificate replacement fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Lost Instrument Bond Calculator The full price tag for lost instrument bond: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Check Stop Payment Calculator The full price tag for check stop payment: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Positive Pay Service Calculator The full price tag for positive pay service: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Account Reconciliation Calculator The full price tag for account reconciliation: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Zero Balance Account Fee Calculator The full price tag for zero balance account fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Sweep Account Fee Calculator The full price tag for sweep account fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Cash Management Fee Calculator The full price tag for cash management fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Business Analysis Fee Calculator The full price tag for business analysis fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Lockbox Service Fee Calculator The full price tag for lockbox service fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Remote Deposit Fee Calculator The full price tag for remote deposit fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.
- Collection Item Fee Calculator The full price tag for collection item fee: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure. Free, instant, with the worked calculation and interpretation ranges.