Authors & Reviewers
The distinguished scholars, industry practitioners, and quantitative specialists behind The Online Calculator 24’s calculators — their focus areas, professional credentials, and the computational engines each has authored and verified.
Adrian Vance, M.Mus, BFA ✓ Verified
Acoustical Engineer & Visual Composition Theorist
Adrian Vance bridges the mathematical foundation of music theory, studio audio delay mechanics (BPM to ms), equal temperament cent deviations, and visual photog…
BPM to Millisecond Delay Times 12-TET Equal Temperament Acoustics Golden Ratio (Phi) Layouts
200 Calculators Authored
Alex Mercer, MSCS ✓ Verified
Principal Systems Architect & Network Performance Engineer
Alex Mercer brings deep infrastructure knowledge to The Online Calculator 24’s computing tools. Having architected multi-petabyte cloud storage topologies and l…
RAID Storage Redundancy CIDR Subnetting & IP Allocations Network Throughput & Transfer Latency
201 Calculators Authored
Captain Nathan Drake, ATP, MS ✓ Verified
Aviation Operations Specialist & Logistics Analyst
Captain Nathan Drake brings airline flight operations expertise to The Online Calculator 24. Having logged over 9,000 flight hours and managed flight dispatch l…
Great-Circle Flight Navigation Flight Block Time & Jetstreams Airline Baggage & Upgrade Valuations
98 Calculators Authored
Carl Broderick, PE ✓ Verified
Licensed Professional Structural Engineer & Construction Estimator
Carl Broderick oversees structural and building material calculations on The Online Calculator 24. With extensive site experience in residential and commercial …
Concrete Slab Volume & Rebar Roof Pitch & Rafter Geometries Structural Timber Sizing
152 Calculators Authored
Chef Claire Delacroix, MS ✓ Verified
Food Scientist & Culinary Chemistry Specialist
Claire Delacroix bridges culinary art and laboratory science. She models Baker's Percentages, meat brine equilibrium equations, FDA temperature danger zone cool…
Baker's Math & Hydration Equilibrium Meat Brining Food Safety (FDA Danger Zone)
151 Calculators Authored
David K. Sterling, ChFC®, RICP® ✓ Verified
Retirement Wealth Strategist & Actuarial Consultant
David Sterling specializes in safe withdrawal rates (Bengen 4% rule extensions), required minimum distributions (IRS Uniform Lifetime Table RMDs), Roth conversi…
401(k) / IRA Modeling Social Security Benefit Timing RMD Distribution Schedules
98 Calculators Authored
Dr. Elena Rostova, MD, PhD ✓ Verified
Chief Medical Reviewer & Clinical Epidemiologist
Dr. Elena Rostova is an academic physician and clinical epidemiologist who ensures that all medical and clinical calculator engines trace directly to peer-revie…
Clinical Biomarkers Cardiovascular Risk (Framingham) Renal Function (eGFR)
259 Calculators Authored
Dr. Hannah Al-Mansoor, PhD ✓ Verified
Senior Biostatistician & Laboratory Quantitative Methodologist
Dr. Hannah Al-Mansoor specializes in Cochran sample size derivation, GUM (ISO/IEC Guide 98-3) measurement uncertainty budgets, Gauss error propagation in physic…
Statistical Power & Sample Size GUM Measurement Uncertainty Budgets Gaussian Error Propagation
153 Calculators Authored
Dr. Julian Hayes, PhD ✓ Verified
Cognitive Ergonomics & Workplace Productivity Researcher
Dr. Julian Hayes studies the economics of human attention, true hourly wage calculations after hidden commuting costs, automation ROI, and maker-vs-manager sche…
True Hourly Worth & Delegation Task Automation ROI Deep Work Capacity Modeling
100 Calculators Authored
Dr. Liam Gallagher, DPT, CSCS ✓ Verified
Doctor of Physical Therapy & Sports Performance Scientist
Dr. Liam Gallagher specializes in neuromuscular performance metrics, 1-Rep Max estimation formulas (Brzycki, Epley, Wathan), and endurance bioenergetics. He con…
1RM Strength Formulas Heart Rate Training Zones VO₂ Max Testing
248 Calculators Authored
Dr. Maya Lin, PhD ✓ Verified
Environmental Scientist & Ecological Modeler
Dr. Maya Lin models greenhouse gas equivalencies, photovoltaic energy yields (NREL PVWatts methodology), and water footprint conservation. Her algorithms enable…
Solar PV Energy Yields GHG / EPA Carbon Equivalencies Water Conservation Auditing
148 Calculators Authored
Dr. Samuel O. Vance, PhD ✓ Verified
Senior Agronomist & Precision Agriculture Specialist
Dr. Samuel Vance is a leading authority on precision agronomy, crop nutrient management (NPK equations), Pearson Square feed ration formulation, and irrigation …
Crop Yield Estimation Soil NPK Chemistry & Fertilizers Pearson Square Feed Rations
100 Calculators Authored
Dr. Sarah Jenkins, CFP® ✓ Verified
Lead Financial Analyst & Quantitative Modeler
Dr. Sarah Jenkins specializes in mathematical models for consumer debt, mortgage amortization algorithms, and banking fee optimization. She leads the quantitati…
Mortgage Amortization Consumer Debt Optimization Tax Bracket Modeling
350 Calculators Authored
Dr. Vikram Chandra, PhD ✓ Verified
Astrophysicist & Orbital Mechanics Researcher
Dr. Vikram Chandra specializes in Newtonian gravitation, Kepler's laws of planetary motion, relativistic escape velocity, and stellar evolution thermodynamics (…
Keplerian Orbital Mechanics Stellar Luminosity & Magnitudes Escape Velocity & Schwarzschild Radii
98 Calculators Authored
Jonathan Ross, Esq., JD ✓ Verified
Legal Analyst & Statutory Modeling Consultant
Jonathan Ross specializes in quantitative legal analysis, child support statutory guideline modeling, personal injury settlement present-value factoring, and co…
Settlement Present Value Statutory Child Support Models Legal Fee Schedules & Escrow
149 Calculators Authored
Lucas Vance, MSc ✓ Verified
Applied Probability Specialist & Calendar Systems Researcher
Lucas Vance applies rigorous mathematical principles to everyday and recreational scenarios: business day calendar exclusions, Texas Hold'em pot odds (Rule of 2…
Business Calendar Algorithms Poker Pot Odds & EV Modeling Roulette Probability & House Edge
196 Calculators Authored
Marcus Vance, CFA ✓ Verified
Senior Portfolio Strategist & Quantitative Equity Analyst
Marcus Vance leads market analysis and equity modeling for The Online Calculator 24. His research focuses on modern portfolio theory (MPT), Sharpe ratio efficie…
Portfolio Theory (MPT) Options Pricing (Black-Scholes) DCF Valuation
250 Calculators Authored
Prof. Arthur Pendelton, Ed.D ✓ Verified
Academic Assessment Lead & Psychometric Statistician
Professor Arthur Pendelton has served on higher education accreditation boards and university admissions committees. He oversees all GPA calculation mechanics, …
Weighted GPA Algorithms Psychometric Percentile Scaling FAFSA EFC/SAI Modeling
148 Calculators Authored
Rachel Hayes, CCIM ✓ Verified
Commercial Real Estate Analyst & Property Valuation Lead
Rachel Hayes oversees all property, rental yield, and commercial real estate calculation engines. With extensive experience in underwriting multifamily acquisit…
Cap Rate & NOI Analysis BRRRR Strategy Modeling Rental Yield Optimization
199 Calculators Authored
Robert H. Thorne, MBA ✓ Verified
Corporate Finance Strategist & Startup Economics Lead
Robert Thorne has evaluated over 250 enterprise investment deals and advised high-growth startups on unit economics, customer lifetime value (LTV/CAC ratios), c…
Break-Even Modeling SaaS Unit Economics (LTV/CAC) Working Capital Optimization
304 Calculators Authored
The Online Calculator 24 Editorial Team ✓ Verified
Cross-Domain Quantitative Validation & Standards Board
The editorial team at The Online Calculator 24 researches, builds, and maintains every calculator on the site. Each engine starts from a documented formula and …
Cross-Domain Formula Validation Standard Datasets Verification Methodology Transparency
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