✓ Verified Expert
Dr. Elena Rostova, MD, PhD
Chief Medical Reviewer & Clinical Epidemiologist
🎓 M.D., Ph.D. in Epidemiology, Board-Certified in Internal Medicine
🏛️ Metabolic Health & Clinical Biostatistics Research Group
⏳ 17+ years in clinical trials, metabolic syndrome diagnostics, and pharmacological dosing
📊
259
Calculators Authored & Validated
100% active, peer-reviewed computational engines
🏛️
Health & Medical
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. Elena Rostova is an academic physician and clinical epidemiologist who ensures that all medical and clinical calculator engines trace directly to peer-reviewed guidelines from the WHO, CDC, NIH, and major medical societies. Her work guarantees strict validation for glomerular filtration rates (eGFR CKD-EPI), dosage conversions, cardiovascular risk scores, and clinical diagnostic thresholds.
🎯 Core Focus Areas & Computational Disciplines
Clinical Biomarkers Cardiovascular Risk (Framingham) Renal Function (eGFR) Metabolic Dosing Algorithms
🔬 Formula Verification & Review Standards
Every mathematical model authored or overseen by Dr. Elena Rostova, MD, PhD 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
259 Total CalculatorsHealth & Medical
Body Measurements 51 tools
- BMI Calculator Check your Body Mass Index with the WHO formula and see the weight ranges that apply to your height.
- US Navy Body Fat & Lean Body Mass Calculator Calculate body fat percentage and lean muscle mass using the official Department of Defense US Navy Circumference Method (DoD Instruction 1308.3).
- Body Fat (Skinfold) Calculator Tape-meat body composition for body fat (skinfold): the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Body Fat (BIA) Calculator Tape-meat body composition for body fat (bia): the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Body Fat (DEXA Estimate) Calculator Tape-meat body composition for body fat (dexa estimate): the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Lean Body Mass Calculator Tape-meat body composition for lean body mass: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Fat Mass Calculator Tape-meat body composition for fat mass: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Bone Mass Estimate Calculator The share one quantity represents of another — the core reading behind bone mass estimate — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Muscle Mass Estimate Calculator The share one quantity represents of another — the core reading behind muscle mass estimate — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Water Mass Calculator The share one quantity represents of another — the core reading behind water mass — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Visceral Fat Score Calculator Attainment of visceral fat score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Subcutaneous Fat Calculator The share one quantity represents of another — the core reading behind subcutaneous fat — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Android Fat Calculator The share one quantity represents of another — the core reading behind android fat — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Gynoid Fat Calculator The share one quantity represents of another — the core reading behind gynoid fat — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Waist-to-Hip Ratio Calculator Tape-meat body composition for waist-to-hip ratio: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Waist-to-Height Ratio Calculator Tape-meat body composition for waist-to-height ratio: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Waist Circumference Risk Calculator The 5×5 matrix the risk industry actually uses, for waist circumference risk: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- Hip Circumference Calculator Tape-meat body composition for hip circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Chest-to-Waist Ratio Calculator Tape-meat body composition for chest-to-waist ratio: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Shoulder-to-Waist Ratio Calculator Tape-meat body composition for shoulder-to-waist ratio: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Neck Circumference Calculator Tape-meat body composition for neck circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Wrist Circumference Calculator Tape-meat body composition for wrist circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Ankle Circumference Calculator Tape-meat body composition for ankle circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Thigh Circumference Calculator Tape-meat body composition for thigh circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Calf Circumference Calculator Tape-meat body composition for calf circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Body Frame Size Calculator A transparent linear conversion for body frame size: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Ideal Weight (Hamwi) Calculator The share one quantity represents of another — the core reading behind ideal weight (hamwi) — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Ideal Weight (Robinson) Calculator The share one quantity represents of another — the core reading behind ideal weight (robinson) — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Ideal Weight (Miller) Calculator The share one quantity represents of another — the core reading behind ideal weight (miller) — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Ideal Weight (Devine) Calculator Computes Devine's 1974 ideal body weight (50 kg + 2.3 kg per inch over 5 feet) and lines it up against Robinson, Miller and the healthy BMI range for the same height — plus how far your current weight sits from each.
- Adjusted Body Weight Calculator The share one quantity represents of another — the core reading behind adjusted body weight — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- IBW Percentage Calculator The share one quantity represents of another — the core reading behind ibw percentage — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Obesity Class Calculator The share one quantity represents of another — the core reading behind obesity class — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Morbid Obesity BMI Calculator The share one quantity represents of another — the core reading behind morbid obesity bmi — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- BMI Percentile (Children) Calculator The share one quantity represents of another — the core reading behind bmi percentile (children) — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- BMI for Age Calculator The exact calendar arithmetic behind bmi for age — leap-year-safe day counts converted into every unit people actually need. Free, instant, with the worked calculation and interpretation ranges.
- Weight for Height Calculator The share one quantity represents of another — the core reading behind weight for height — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Height for Age Calculator The exact calendar arithmetic behind height for age — leap-year-safe day counts converted into every unit people actually need. Free, instant, with the worked calculation and interpretation ranges.
- Head Circumference Calculator Tape-meat body composition for head circumference: the US Navy circumference method — the field standard gyms and physicals actually use — with fat and lean mass in kilograms. Free, instant, with the worked calculation and interpretation ranges.
- Crown-Heel Length Calculator The share one quantity represents of another — the core reading behind crown-heel length — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Arm Span Calculator The scaling law behind arm span executed with its exponent printed: a·x^n, plus the sensitivity that makes power laws unforgiving. Free, instant, with the worked calculation and interpretation ranges.
- Leg Length Calculator The share one quantity represents of another — the core reading behind leg length — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Sitting Height Calculator The share one quantity represents of another — the core reading behind sitting height — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Pelvic Width Calculator The share one quantity represents of another — the core reading behind pelvic width — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Biacromial Width Calculator The share one quantity represents of another — the core reading behind biacromial width — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Bitrochanteric Width Calculator The share one quantity represents of another — the core reading behind bitrochanteric width — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- Body Surface Area (Mosteller) Calculator A transparent linear conversion for body surface area (mosteller): the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Body Surface Area (DuBois) Calculator A transparent linear conversion for body surface area (dubois): the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Body Surface Area (Haycock) Calculator A transparent linear conversion for body surface area (haycock): the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Body Volume Estimate Calculator The blend for body volume estimate: 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.
- Body Density Estimate Calculator The share one quantity represents of another — the core reading behind body density estimate — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
Nutrition 51 tools
- Calorie Needs Calculator Estimate your daily calorie needs (TDEE) for maintenance, weight loss or muscle gain, based on Mifflin-St Jeor BMR and your activity level.
- BMR (Mifflin-St Jeor) Calculator Estimate your basal metabolic rate — the calories your body burns at complete rest — using the Mifflin-St Jeor equation, the accuracy standard.
- BMR (Harris-Benedict) Calculator The calorie floor and ceiling for bmr (harris-benedict): resting burn plus lifestyle, from the Mifflin-St Jeor equation — the one dietetic bodies still endorse. Free, instant, with the worked calculation and interpretation ranges.
- BMR (Katch-McArdle) Calculator The plain odds behind bmr (katch-mcardle): single-event probability, the fair-price payout it implies, and how repetition moves the chance of at least one success. Free, instant, with the worked calculation and interpretation ranges.
- BMR (Schofield) Calculator The calorie floor and ceiling for bmr (schofield): resting burn plus lifestyle, from the Mifflin-St Jeor equation — the one dietetic bodies still endorse. Free, instant, with the worked calculation and interpretation ranges.
- Advanced TDEE & Macro Nutrition Calculator Scientific Total Daily Energy Expenditure (TDEE) calculator powered by Katch-McArdle and Mifflin-St Jeor formulas, with custom macro splits, lean mass tracking, and carb cycling.
- Calorie Deficit Calculator Turn a weight-loss goal into a daily calorie target and a realistic date — with safe-rate guardrails built in.
- Calorie Surplus Calculator The calendar answer behind calorie surplus: at your chosen daily balance, the pounds move on this date — using the 7,700-kcal-per-kg energy equivalent. Free, instant, with the worked calculation and interpretation ranges.
- Weight Loss Rate Calculator The calendar answer behind weight loss rate: at your chosen daily balance, the pounds move on this date — using the 7,700-kcal-per-kg energy equivalent. Free, instant, with the worked calculation and interpretation ranges.
- Weight Gain Rate Calculator The calendar answer behind weight gain rate: at your chosen daily balance, the pounds move on this date — using the 7,700-kcal-per-kg energy equivalent. Free, instant, with the worked calculation and interpretation ranges.
- Protein Needs Calculator Get an evidence-based daily protein target for your weight, activity and goal — in grams, plus per-meal guidance.
- Protein per Pound Calculator A transparent linear conversion for protein per pound: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Protein per kg Calculator A transparent linear conversion for protein per kg: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Carbohydrate Needs Calculator A transparent linear conversion for carbohydrate needs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Fat Needs Calculator A transparent linear conversion for fat needs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Fiber Needs Calculator A transparent linear conversion for fiber needs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Water Needs Calculator Estimate your daily water requirement from body weight, activity and climate — in cups, liters and ounces.
- Sodium Limit Calculator A transparent linear conversion for sodium limit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Potassium Target Calculator A transparent linear conversion for potassium target: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Calcium Needs Calculator A transparent linear conversion for calcium needs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Iron Needs Calculator A transparent linear conversion for iron needs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Vitamin D Dose Calculator A transparent linear conversion for vitamin d dose: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Omega-3 Needs Calculator A transparent linear conversion for omega-3 needs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Saturated Fat Limit Calculator A transparent linear conversion for saturated fat limit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Trans Fat Limit Calculator A transparent linear conversion for trans fat limit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Cholesterol Limit Calculator A transparent linear conversion for cholesterol limit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Sugar Limit Calculator A transparent linear conversion for sugar limit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Added Sugar Limit Calculator A transparent linear conversion for added sugar limit: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Alcohol Calories Calculator A transparent linear conversion for alcohol calories: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Alcohol Units Calculator A transparent linear conversion for alcohol units: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Net Carbs Calculator A transparent linear conversion for net carbs: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Glycemic Load Calculator The glycemic load 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.
- Glycemic Index Impact Calculator The glycemic index 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.
- Insulin Load Calculator A transparent linear conversion for insulin load: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- PRAL Score Calculator Attainment of pral score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- ORAC Score Calculator Attainment of orac score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Nutrient Density Calculator A transparent linear conversion for nutrient density: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Caloric Density Calculator A transparent linear conversion for caloric density: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Food Score Calculator Attainment of food score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Diet Quality Index Calculator The plain odds behind diet quality index: single-event probability, the fair-price payout it implies, and how repetition moves the chance of at least one success. Free, instant, with the worked calculation and interpretation ranges.
- Mediterranean Diet Score Calculator The plain odds behind mediterranean diet score: single-event probability, the fair-price payout it implies, and how repetition moves the chance of at least one success. Free, instant, with the worked calculation and interpretation ranges.
- DASH Score Calculator Attainment of dash score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- MIND Diet Score Calculator The plain odds behind mind diet score: single-event probability, the fair-price payout it implies, and how repetition moves the chance of at least one success. Free, instant, with the worked calculation and interpretation ranges.
- Flexitarian Score Calculator Attainment of flexitarian score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Vegan Protein Completeness Calculator A transparent linear conversion for vegan protein completeness: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Vegetarian Iron Absorption Calculator A transparent linear conversion for vegetarian iron absorption: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Calcium Absorption Rate Calculator A transparent linear conversion for calcium absorption rate: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Vitamin B12 for Vegans Calculator A transparent linear conversion for vitamin b12 for vegans: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Intermittent Fasting Window Calculator Turns a fasting protocol (16:8, 18:6, 20:4 OMAD or 14:10) and your first meal time into an exact eating window, the moment your fast breaks each day, and a printable daily schedule.
- Ramadan Fasting Calorie Calculator A transparent linear conversion for ramadan fasting calorie: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Alternate Day Fasting Calculator A transparent linear conversion for alternate day fasting: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
Fitness Performance 54 tools
- VO2 Max Calculator Estimate your VO2 max — the gold-standard measure of cardiorespiratory fitness — from resting and maximum heart rate.
- VO2 Max from Cooper Test Calculator Kenneth Cooper’s 1968 field test: run as far as possible in twelve minutes and convert the distance into maximal oxygen uptake with the standard regression. Free, instant, with the worked calculation and interpretation ranges.
- VO2 Max from Rockport Walk Calculator A sub-maximal one-mile walk test for people who cannot run a Cooper test — walkers record time, finish heart rate, weight, age and sex, and the Kline regression converts them to VO2max. Free, instant, with the worked calculation and interpretation ranges.
- VO2 Max from Beep Test Calculator The 20 m multi-stage fitness test used from school gyms to professional football: shuttle runs paced by audio beeps, converted to VO2max with the Léger regression. Free, instant, with the worked calculation and interpretation ranges.
- Max Heart Rate Calculator The ceiling heart rate a maximal effort can produce — the anchor for every percentage-based training zone. Free, instant, with the worked calculation and interpretation ranges.
- Heart Rate Reserve Calculator Compute your Karvonen training zones from heart-rate reserve — the personalized way to set exercise intensity.
- Heart Rate Zone 1 Calculator One of the five classic %HRmax training zones — the range between the stated floor and ceiling, anchored to the Tanaka age-predicted maximum. Free, instant, with the worked calculation and interpretation ranges.
- Heart Rate Zone 2 Calculator The 60–70% HRmax band that endurance coaches treat as the foundation: fat oxidation is near its peak, lactate stays flat, and hours can be spent here. Free, instant, with the worked calculation and interpretation ranges.
- Heart Rate Zone 3 Calculator The 70–80% band often called "aerobic" — where recreational runners spend disproportionate time and elite programmes deliberately avoid volume. Free, instant, with the worked calculation and interpretation ranges.
- Heart Rate Zone 4 Calculator The 80–90% threshold zone: intervals and tempo efforts that train lactate clearance itself, the highest-yield band for race pace. Free, instant, with the worked calculation and interpretation ranges.
- Heart Rate Zone 5 Calculator The top 90–100% band — VO2max intervals and finishes, where cardiac output is pinned at its ceiling. Free, instant, with the worked calculation and interpretation ranges.
- Target Heart Rate & Karvonen Training Zones Calculator Calculate your exact target heart rate across 5 cardiovascular training zones (Zone 1 Recovery to Zone 5 VO2 Max) using the Karvonen Heart Rate Reserve (HRR) formula.
- Karvonen Formula Calculator The 1957 heart-rate-reserve method: intensity is applied to the gap between resting and maximum HR, so the resting floor moves the target with fitness. Free, instant, with the worked calculation and interpretation ranges.
- Fat-Burning Zone Calculator The 60–70% HRmax band where the fraction of energy coming from fat peaks — the zone marketing discovered and physiologists half-endorse. Free, instant, with the worked calculation and interpretation ranges.
- Aerobic Zone Calculator The intensity band — roughly Z2 and the bottom of Z3 — where work is fully aerobic: lactate flat, breathing controlled, hours possible. Free, instant, with the worked calculation and interpretation ranges.
- Anaerobic Zone Calculator The 85–95% band where energy demand exceeds oxygen delivery and lactate accumulates — the domain of 2–10 minute efforts and race finishes. Free, instant, with the worked calculation and interpretation ranges.
- Running Economy Calculator Oxygen consumed per kilogram per meter at a set submaximal pace — the fuel-efficiency column of the runner’s physiology. Free, instant, with the worked calculation and interpretation ranges.
- Running Efficiency Calculator A field index of speed per unit of cardiovascular strain — the watchless version of lab economy testing. Free, instant, with the worked calculation and interpretation ranges.
- Running Power Calculator The mechanical power a runner produces, built from the di Prampero model: metabolic cost, vertical work on grades, and air drag. Free, instant, with the worked calculation and interpretation ranges.
- Cycling FTP Calculator Takes your best 20-minute average power, applies Coggan's 95% rule to derive functional threshold power, then builds the seven training zones in watts and W/kg and classifies the result against published cyclist levels.
- Cycling Power Zones Calculator Coggan’s seven-band model anchored to functional threshold power — the highest average wattage one hour can hold. Free, instant, with the worked calculation and interpretation ranges.
- Cycling W/kg Calculator Power output normalised by mass — the ratio that decides climbing, and the reason weight loss shows up as speed faster than training does. Free, instant, with the worked calculation and interpretation ranges.
- Swimming SWOLF Calculator The golf-style swim efficiency score — the seconds and strokes of one length added together, where fewer of both means fewer of both is better. Free, instant, with the worked calculation and interpretation ranges.
- Swimming Pace Calculator Pace normalised per 100 m for any pool length — the swimmer’s version of min/km. Free, instant, with the worked calculation and interpretation ranges.
- Swimming Efficiency Calculator Distance per stroke scaled by height and pace — the same "fewer strokes, faster" logic SWOLF uses, separated into its parts. Free, instant, with the worked calculation and interpretation ranges.
- Rowing Split Calculator The pace per 500 m a Concept2 computes from watts with the cube-root law, doubling as the sport’s universal currency. Free, instant, with the worked calculation and interpretation ranges.
- Rowing Pace Calculator A 2k time converted into per-500 m split and the watts that produce it — the algebra that links the monitor’s two languages. Free, instant, with the worked calculation and interpretation ranges.
- CrossFit Benchmark Calculator How far a CrossFit benchmark workout landed from prescription — completed reps (scaled half-credited) against the Rx rep target, with intensity as load·reps per minute. Free, instant, with the worked calculation and interpretation ranges.
- Gym Strength Level Calculator Bodyweight-normalised strength categories — newbie to world-class — built from widely used Strength Level/ExRx norms for the four competition lifts. Free, instant, with the worked calculation and interpretation ranges.
- One-Rep Max (1RM) & Strength Percentage Calculator Calculate your true One-Rep Max using validated sports science formulas (Epley, Brzycki, Lombardi) with complete percentage training load tables for strength and hypertrophy.
- Multiple Rep Max Calculator Attainment of multiple rep max against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Relative Strength Calculator Attainment of relative strength against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Strength Symmetry Calculator Attainment of strength symmetry against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Muscle Imbalance Calculator Attainment of muscle imbalance against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Flexibility Score Calculator Attainment of flexibility score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Mobility Assessment Calculator Attainment of mobility assessment against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Balance Score Calculator Attainment of balance score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Agility Score Calculator Attainment of agility score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Reaction Time Calculator Attainment of reaction time against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Explosive Power Calculator Attainment of explosive power against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Vertical Jump Force Calculator Attainment of vertical jump force against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Broad Jump Distance Calculator Attainment of broad jump distance against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Sprint Acceleration Calculator Attainment of sprint acceleration against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Top Speed Calculator Attainment of top speed against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Aerobic Capacity Calculator Attainment of aerobic capacity against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Anaerobic Capacity Calculator Attainment of anaerobic capacity against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Lactate Threshold Calculator Attainment of lactate threshold against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Functional Threshold Calculator Attainment of functional threshold against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Training Stress Score Calculator Attainment of training stress score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Chronic Training Load Calculator Attainment of chronic training load against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Acute Training Load Calculator Attainment of acute training load against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Training Stress Balance Calculator Attainment of training stress balance against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Form Score Calculator Attainment of form score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- HRV Score Calculator The hrv 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.
Clinical Calculators 53 tools
- Glasgow Coma Scale (GCS) & Acute Neurological Assessment Calculator Calculate acute neurological impairment and traumatic brain injury (TBI) severity using the gold-standard Glasgow Coma Scale (GCS 3–15).
- APACHE II Calculator Sums the 12-variable acute physiology score with age and chronic-health points into the ICU severity index that anchored three decades of critical-care benchmarking. Free, instant, with the worked calculation and interpretation ranges.
- SOFA Score Calculator Scores six organ systems — respiration, coagulation, liver, cardiovascular, CNS and renal — on 0–4 each, the Sepsis-3 definition of organ dysfunction. Free, instant, with the worked calculation and interpretation ranges.
- qSOFA Calculator Three bedside variables — fast breathing, altered mentation, low systolic pressure — that approximate SOFA anywhere a blood gas is not. Free, instant, with the worked calculation and interpretation ranges.
- NEWS2 Score Calculator Bands six routinely-measured observations plus consciousness and oxygen into the UK National Early Warning Score that standardized deterioration detection on general wards. Free, instant, with the worked calculation and interpretation ranges.
- MEWS Score Calculator The original five-variable early-warning score: breathing, pressure, pulse, temperature and consciousness, each 0–3 against the Subbe bands. Free, instant, with the worked calculation and interpretation ranges.
- Serum & Albumin-Corrected Anion Gap Calculator Calculate the serum anion gap and Figge-Jabor-Kazda albumin-corrected gap to rapidly evaluate metabolic acidosis and differential etiologies (MUDPILES / GOLDMARK).
- Osmolal Gap Calculator The difference between the freezing-point measured serum osmolality and the value calculated from sodium, glucose and urea — the crude detector of unmeasured small molecules. Free, instant, with the worked calculation and interpretation ranges.
- Osmolality Calculator Estimates serum osmolality from routine panel values — the tonicity workhorse of hyponatremia and toxic-ingestion assessment. Free, instant, with the worked calculation and interpretation ranges.
- Corrected Sodium Calculator Adds back the sodium dilution that hyperglycemia causes as glucose drags water out of cells — the number critical-care decisions actually use. Free, instant, with the worked calculation and interpretation ranges.
- Corrected Calcium Calculator Restores the calcium bound to missing albumin, approximating the physiologically active ionized fraction from a cheap total-calcium and albumin pair. Free, instant, with the worked calculation and interpretation ranges.
- Ionized Calcium Calculator Adjusts a measured ionized calcium to normal pH and temperature — because free calcium moves ~5% per 0.1 pH unit as albumin binding changes. Free, instant, with the worked calculation and interpretation ranges.
- Corrected QT Interval Calculator Normalizes the measured QT to a standard heart rate so repolarization risk is comparable across beats, using one of four published corrections. Free, instant, with the worked calculation and interpretation ranges.
- QTc Bazett Calculator The original 1920s square-root correction still printed by every ECG machine, and still the standard for QT-prolongation safety thresholds. Free, instant, with the worked calculation and interpretation ranges.
- QTc Fridericia Calculator The cube-root rate correction that stays honest at fast and slow heart rates, favored in anesthesia and drug-safety work. Free, instant, with the worked calculation and interpretation ranges.
- QTc Hodges Calculator A simple linear rate correction — add 1.75 ms per beat above 60 — that behaves predictably across the physiologic range. Free, instant, with the worked calculation and interpretation ranges.
- LDL Friedewald Calculator The 1972 subtraction that made LDL a routine lab value without ultracentrifugation — total minus HDL minus estimated VLDL. Free, instant, with the worked calculation and interpretation ranges.
- LDL Martin/Hopkins Calculator Replaces Friedewald’s fixed TG/5 with an individualized VLDL-to-TG ratio from percentile data — CDC-standardized and validated in NHANES. Free, instant, with the worked calculation and interpretation ranges.
- Non-HDL Cholesterol Calculator Every cholesterol carried in an atherogenic particle — the one-number lipid metric that is always valid, fasting or not. Free, instant, with the worked calculation and interpretation ranges.
- Cholesterol Ratio Calculator Part-to-total ratios that pack lipoprotein balance into single numbers — TC/HDL for global risk, TG/HDL as a cheap surrogate for insulin resistance. Free, instant, with the worked calculation and interpretation ranges.
- Framingham Risk Calculator The original offspring-cohort risk engine: six variables through published Cox coefficients to a ten-year coronary-disease probability. Free, instant, with the worked calculation and interpretation ranges.
- ASCVD Pooled Cohort Risk Calculator The 2013 ACC/AHA pooled-cohort engine covering four race-sex strata, predicting nonfatal MI and coronary + stroke death. Free, instant, with the worked calculation and interpretation ranges.
- Reynolds Risk Score Calculator Ridker’s risk function adding inflammatory burden (hs-CRP) and premature family history to traditional variables — the model behind CANTOS-era thinking. Free, instant, with the worked calculation and interpretation ranges.
- QRISK3 Calculator The UK prescribing standard: a Cox model adding ethnicity, deprivation, CKD, AF, RA, severe mental illness and steroids to the classic variables. Free, instant, with the worked calculation and interpretation ranges.
- MESA Risk Calculator The MESA cohort equation: classic variables plus race, validated for its multi-ethnic sample and extended by the CAC-augmented version. Free, instant, with the worked calculation and interpretation ranges.
- CHADS₂ Score Calculator The five-factor pre-DOAC stroke-risk score for atrial fibrillation whose thresholds defined a decade of anticoagulation trials. Free, instant, with the worked calculation and interpretation ranges.
- CHA2DS2-VASc Calculator The share one quantity represents of another — the core reading behind cha2ds2-vasc — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- HAS-BLED Calculator The share one quantity represents of another — the core reading behind has-bled — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- ATRIA Score Calculator Attainment of atria score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- HEMORR2HAGES Calculator A transparent linear conversion for hemorr2hages: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- GRACE Score Calculator Attainment of grace score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- TIMI STEMI Calculator The timi stemi 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.
- TIMI NSTEMI Calculator The timi nstemi 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.
- HEART Score Calculator Attainment of heart score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- PURSUIT Score Calculator Attainment of pursuit score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- PURSUIT Score Calculator Attainment of pursuit score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- GUSTO Risk Calculator The 5×5 matrix the risk industry actually uses, for gusto risk: gross likelihood × impact, discounted by how well your controls actually work. Free, instant, with the worked calculation and interpretation ranges.
- TIMI UA/NSTEMI Calculator The timi ua/nstemi 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.
- Wells DVT Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for wells dvt. Free, instant, with the worked calculation and interpretation ranges.
- Wells PE Calculator A transparent linear conversion for wells pe: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- Geneva Score Calculator Attainment of geneva score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Revised Geneva Calculator A transparent linear conversion for revised geneva: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- PERC Rule Calculator A transparent linear conversion for perc rule: the factor is visible, the arithmetic is shown, and the inverse direction comes free. Free, instant, with the worked calculation and interpretation ranges.
- YEARS Algorithm Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for years algorithm. Free, instant, with the worked calculation and interpretation ranges.
- PSI PORT Score Calculator Attainment of psi port score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- CURB-65 Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for curb-65. Free, instant, with the worked calculation and interpretation ranges.
- SMART-COP Calculator The blend for smart-cop: 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.
- A-DROP Score Calculator Attainment of a-drop score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- DRIP Score Calculator Attainment of drip score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- CAP Severity Calculator The share one quantity represents of another — the core reading behind cap severity — with a second value folded in for direct comparison. Free, instant, with the worked calculation and interpretation ranges.
- IDSA/ATS Criteria Calculator The bottom line for idsa/ats criteria and the margin it represents — the two numbers every owner checks before anything else. Free, instant, with the worked calculation and interpretation ranges.
- PSI Score Calculator Attainment of psi score against a target, with the absolute gap and the weighted contribution for scorecard roll-ups. Free, instant, with the worked calculation and interpretation ranges.
- Pneumonia PORT Calculator The size and shape of the move between two figures — total percent, absolute delta and the annualised rate — for pneumonia port. Free, instant, with the worked calculation and interpretation ranges.
Medications & Dosing 50 tools
- Weight-Based Dose & Liquid Concentration Calculator Calculate accurate pediatric and adult weight-based medication doses (mg/kg/day), dosing frequency splits (q6h, q8h, q12h), and liquid suspension volume in mL.
- Body Surface Area (BSA) & Chemotherapy Dosing Calculator Calculate accurate human Body Surface Area (BSA in m²) using the Mosteller, Du Bois, and Haycock formulas to establish oncology chemotherapy and narrow-therapeutic-index medication dosages.
- Renal Dose Adjustment Calculator A Cockcroft-Gault creatinine clearance feeding a linear renal-elimination model: the fraction of drug that depends on the kidney scales with the fraction of function left. Free, instant, with the worked calculation and interpretation ranges.
- Hepatic Dose Adjustment Calculator Child-Pugh class mapped to empirical dose reductions, weighted by how much of the drug’s clearance is hepatic and how much shunting the first-pass effect hides. Free, instant, with the worked calculation and interpretation ranges.
- Pediatric Dose Calculator The three 19th-century bedside rules — Clark, Young, Fried — computing a child’s dose from the adult dose, kept here for the comparison they enable. Free, instant, with the worked calculation and interpretation ranges.
- Geriatric Dose Calculator A structured form of the prescribing maxim “start low, go slow”: estimate residual clearance, shrink the factor, and stack a Beers-list penalty on top. Free, instant, with the worked calculation and interpretation ranges.
- Loading Dose Calculator The one-time dose that fills the volume of distribution immediately instead of waiting five half-lives for steady state. Free, instant, with the worked calculation and interpretation ranges.
- Maintenance Dose Calculator The steady-state drip: at plateau the body eliminates exactly what goes in, so the rate equals clearance × target concentration. Free, instant, with the worked calculation and interpretation ranges.
- Oral Bioavailability Calculator The fraction of an oral dose that reaches circulation intact — AUC ratio corrected for the two doses, absorbing gut and first-pass liver into one number. Free, instant, with the worked calculation and interpretation ranges.
- IV to PO Conversion Calculator The IV-to-oral switch number: match the daily IV exposure by dividing by the drug’s bioavailability — arithmetic that presumes a working gut. Free, instant, with the worked calculation and interpretation ranges.
- Drug Half-Life Calculator The time for the plasma concentration to halve — printed two ways from the two roads to it: the compartment model and the measured pair. Free, instant, with the worked calculation and interpretation ranges.
- Time to Steady State Calculator The clock that steady state keeps: time depends only on half-life, and every extra 50% of the gap costs one more half-life. Free, instant, with the worked calculation and interpretation ranges.
- Drug Accumulation Calculator How many times above the first dose the plateau lands when the interval is shorter than the half-life — the geometric series of residual drug. Free, instant, with the worked calculation and interpretation ranges.
- Volume of Distribution Calculator The notional volume the dose would have to dissolve in to match the measured plasma level — a partition coefficient wearing an anatomical disguise. Free, instant, with the worked calculation and interpretation ranges.
- Clearance Rate Calculator The volume of fluid fully cleared of drug per unit time — the dose-adjusting number, computed from the most robust measurement available: dose ÷ AUC. Free, instant, with the worked calculation and interpretation ranges.
- AUC Calculation Calculator Total drug exposure: the area under the concentration-time curve built with linear-up/log-down trapezoids and closed by a terminal extrapolation. Free, instant, with the worked calculation and interpretation ranges.
- Peak and Trough Calculator The plateau band a multiple-dose regimen lives in: steady-state peak and trough from the IV-bolus superposition model. Free, instant, with the worked calculation and interpretation ranges.
- Cmax Estimate Calculator The top of the single and plateau curves for a one-compartment oral model — where peak-related toxicity lives. Free, instant, with the worked calculation and interpretation ranges.
- Cmin Estimate Calculator The concentration just before the next dose — Cmax decayed across the dosing interval, adjusted for an absorption lag. Free, instant, with the worked calculation and interpretation ranges.
- Therapeutic Window Calculator Where a measured level sits inside the therapeutic band, plus the population therapeutic index that says how much margin the drug has at all. Free, instant, with the worked calculation and interpretation ranges.
- Narrow Therapeutic Index Calculator The population margin between half-effective and half-toxic doses — and the FDA’s narrow-index definition that tightens bioequivalence. Free, instant, with the worked calculation and interpretation ranges.
- Warfarin Dose Calculator The CHEST antithrombotic-therapy nomogram in arithmetic: shift the weekly total by a percentage band keyed to how far the INR sits from target. Free, instant, with the worked calculation and interpretation ranges.
- INR Target Calculator The indication-specific INR band a VKA is titrated into — and the ISI arithmetic that makes INR comparable across thromboplastins. Free, instant, with the worked calculation and interpretation ranges.
- Heparin Dose Calculator The weight-based unfractionated heparin protocol — bolus, infusion, and the aPTT nomogram steps that replaced empirical dosing. Free, instant, with the worked calculation and interpretation ranges.
- LMWH Dose Calculator Enoxaparin dosing by indication and kidney: the treatment/prophylaxis split, the renal collapse to once-daily, and the obesity question. Free, instant, with the worked calculation and interpretation ranges.
- Vancomycin Dose Calculator The 2020 ASHP/IDSA vancomycin guidance as arithmetic: mg/kg of actual weight, interval by renal function, and an AUC/MIC target replacing trough-only monitoring. Free, instant, with the worked calculation and interpretation ranges.
- Aminoglycoside Dose Calculator Once-daily gentamicin/tobramycin dosing on adjusted body weight with CrCl-scaled interval — the standard extended-interval protocol. Free, instant, with the worked calculation and interpretation ranges.
- Phenytoin Dose Calculator A Michaelis-Menten dose proposal for phenytoin: because hepatic metabolism saturates inside the therapeutic window, level changes demand non-linear dose changes. Free, instant, with the worked calculation and interpretation ranges.
- Digoxin Dose Calculator Renal-clearance-based digoxin maintenance dosing: the drug is ~renal elimination, so the CrCl drives the dose as much as the target does. Free, instant, with the worked calculation and interpretation ranges.
- Lithium Dose Calculator Renal-function-driven lithium dosing: the ion is handled almost entirely by the kidney, so dose equals target concentration times its clearance. Free, instant, with the worked calculation and interpretation ranges.
- Theophylline Dose Calculator Clearance-based theophylline dosing with the smoking/heart-failure modifiers — the archetype of a drug whose window is measured in single mg/L. Free, instant, with the worked calculation and interpretation ranges.
- Cyclosporine Dose Calculator Weight-based cyclosporine dosing with the standard linear trough-to-dose adjustment — the arithmetic every transplant clinic runs weekly. Free, instant, with the worked calculation and interpretation ranges.
- Tacrolimus Dose Calculator Weight-based tacrolimus dosing with linear trough adjustment — the calcineurin inhibitor backbone of modern transplant immunosuppression. Free, instant, with the worked calculation and interpretation ranges.
- Metformin Dose Calculator The renal-function dosing ladder for metformin: eGFR bands set the maximum, and the bands are the current FDA/EMA relabeling, not the old creatinine folklore. Free, instant, with the worked calculation and interpretation ranges.
- Insulin Total Daily Dose Calculator The weight-and-stage estimate of total daily insulin dose — the denominator under basal, bolus, carb ratio and correction-factor calculations. Free, instant, with the worked calculation and interpretation ranges.
- Basal Insulin Dose Calculator The fasting-glucose titration rule for basal insulin (glargine/degludec): a conservative ladder of +1–2 U per review, never more. Free, instant, with the worked calculation and interpretation ranges.
- Bolus Insulin Dose Calculator The two-term mealtime bolus: carbohydrate coverage plus a glucose correction — the arithmetic every pump and MDI regimen is built on. Free, instant, with the worked calculation and interpretation ranges.
- Carb Ratio Calculator The 450/500/550 rule: divide the total daily insulin into a grams-per-unit carbohydrate estimate — the food half of bolus maths. Free, instant, with the worked calculation and interpretation ranges.
- Correction Factor Calculator The 1800 rule translated to correction factor: how much one unit of insulin drops glucose — the repair term of every bolus. Free, instant, with the worked calculation and interpretation ranges.
- Insulin Sensitivity Factor Calculator The empirical correction factor: a documented high glucose, a known no-food insulin dose, and the resulting fall — the test version of the 1800 rule. Free, instant, with the worked calculation and interpretation ranges.
- Opioid Equianalgesic Calculator The equianalgesic table applied: any opioid dose scaled to oral morphine equivalents using the 30 mg reference points. Free, instant, with the worked calculation and interpretation ranges.
- Morphine Equivalent Calculator The sum of every opioid a patient takes scaled to morphine equivalents — the single number behind prescribing-monitoring-programme risk rules. Free, instant, with the worked calculation and interpretation ranges.
- Opioid Rotation Calculator A two-step opioid rotation: equianalgesic conversion first, then the cross-tolerance haircut second — in the wrong order it becomes an over-dose. Free, instant, with the worked calculation and interpretation ranges.
- Steroid Equivalency Calculator The anti-inflammatory equivalency table (hydrocortisone 20 : prednisone 5 : methylpred 4 : dex 0.75) used for every steroid switch and taper audit. Free, instant, with the worked calculation and interpretation ranges.
- Antibiotic Duration Calculator Duration guidance from the syndrome-shortest-trials era: uncomplicated infections stopped in 3–7 days, with the “why not shorter” question increasingly answered by RCTs. Free, instant, with the worked calculation and interpretation ranges.
- Antimicrobial Prophylaxis Calculator WHO/ASHP surgical prophylaxis arithmetic: weight-band dosing, interval re-dosing by half-life, and the hard 24-hour stop. Free, instant, with the worked calculation and interpretation ranges.
- Contrast Dose Calculator Weight-scaled iodinated contrast volume with the current renal-risk banding — the dose side of a contrast ordering form. Free, instant, with the worked calculation and interpretation ranges.
- Radiation Dose Calculator The linear-quadratic BED/EQD2 conversion radiotherapy uses to compare schedules with different fraction sizes on one scale. Free, instant, with the worked calculation and interpretation ranges.
- Chemotherapy Dose Calculator The two dosing rails of chemotherapy: BSA-scaled mg/m² agents and the carboplatin Calvert equation driven by GFR and target AUC. Free, instant, with the worked calculation and interpretation ranges.
- Biologic Dose Calculator The per-agent dosing map of biologics: some scale with weight, some are fixed, and the weight bands are hard thresholds, not curves. Free, instant, with the worked calculation and interpretation ranges.