Health, Fitness, Nutrition & Body Calculators

BMI, calories, heart rate, nutrition and body tools.

75 tools · 100% Free · Works Offline

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BMI CalculatorCalculate your body mass index from height and weight to check your BMI category, free and…

BMR CalculatorEstimates adult resting energy (BMR/REE) with the Mifflin–St Jeor (1990) or revised…

TDEE CalculatorWork out your total daily energy expenditure and calorie needs based on activity level with…

Calorie Deficit CalculatorFind the daily calorie deficit needed to lose weight at your target rate and timeline with this…

All Health, Fitness, Nutrition & Body Calculators (75)

Guide to Health Calculators

This hub covers everyday body metrics (BMI, body fat, waist ratios), nutrition and energy maths (calories, macros, protein, hydration), heart-rate training zones, and pace and finish-time predictors for running, swimming, cycling, rowing and multisport events. It's used by recreational athletes planning a race or session, people managing weight or diet, and anyone checking a quick body or lifestyle figure.

Energy, weight and macros

Start with BMR for resting burn, then TDEE for daily total including activity; use the deficit and timeline tools to plan a rate of change, and macro/protein tools to split that intake.

BMR Calculator TDEE Calculator Calorie Deficit Calculator Macro Calculator Protein Intake Calculator Weight Change Timeline Calculator

Body measurements and composition

BMI gives a quick screen; waist-to-height and waist-to-hip add shape context, while body-fat and frame-size tools describe composition rather than just weight.

BMI Calculator BMI Prime Calculator Body Fat Percentage Range Calculator Waist-to-Height Ratio Calculator Waist-to-Hip Ratio Calculator Ideal Body Weight Calculator Body Frame Size Calculator

Run, walk and pace planning

Use the running or walking pace tool to convert speed, time and distance; switch to the target-pace or race-time predictors when you know the goal and need the splits.

Running Pace Calculator Walking Pace Calculator Target Pace Calculator Race Time Predictor Race Finish Time Calculator Marathon Split Calculator Negative Split Planner Steps to Distance Calculator

Swim, bike and row sessions

Pick the sport-specific split or predictor: critical swim speed and pace tools for the pool, FTP and power-to-weight for the bike, and 2 km or 500 m splits plus a watts calculator for the erg.

Critical Swim Speed Calculator Swimming Pace Calculator Swim Time Predictor FTP Training Zone Calculator Power-to-Weight Calculator 2 km Row Time Predictor Rowing 500m Split Calculator Rowing Watts Calculator

Multisport and endurance events

Combine leg times into one finish estimate for triathlon and its variants, or use the brick and swimrun tools to plan transitions and mixed-discipline sessions.

Triathlon Finish Time Calculator Duathlon Calculator Aquathlon Calculator Aquabike Calculator Brick Workout Calculator Swimrun Calculator Custom Multisport Calculator

Heart rate, hydration and lifestyle

Set training zones with max heart rate or the Karvonen (reserve) method, then check hydration; the alcohol and smoking tools are lifestyle estimates only, not health advice.

Max Heart Rate Calculator Karvonen Heart Rate Calculator Daily Water Intake Calculator Standard Drinks Calculator Blood Alcohol Range Calculator Pack-Years Calculator Cost of Smoking Calculator

Important calculation notice

These calculators are intended for education, estimation and preliminary checks. Verify all inputs, units, assumptions, material properties and applicable standards. Safety-critical or final engineering designs should be checked by a suitably qualified professional.

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Health, Fitness, Nutrition & Body Calculators

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All Health, Fitness, Nutrition & Body Calculators (75)

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