Health & Body
BMI, calories, fitness, hydration and wellness calculators.
22 calculators
BMI calculator
Calculate your Body Mass Index and see where you fall in the healthy weight range.
TDEE calculator
Calculate your Total Daily Energy Expenditure — the calories you burn each day.
Body fat percentage calculator
Estimate your body fat percentage using the US Navy method (neck, waist, and hip measurements).
Macro calculator
Calculate your daily protein, carbohydrate and fat targets based on your goal.
Running pace calculator
Calculate pace, finish time, or distance — enter any two to find the third.
1 Rep Max calculator
Estimate your one-rep maximum using Epley, Brzycki and Lombardi formulas.
Daily water intake calculator
Calculate your personalised daily hydration target based on weight, activity and climate.
Blood alcohol (BAC) estimator
Estimate blood alcohol content using the Widmark formula, with a drive-safe check.
Heart rate training zones
Calculate your five heart rate training zones from your maximum and resting heart rate.
Ideal body weight calculator
Calculate ideal body weight using the Hamwi, Devine and Robinson formulas.
Pregnancy due date calculator
Calculate your estimated due date and key trimester milestones from your last period.
Sleep debt calculator
Calculate your accumulated sleep debt over the past week and its impact on performance.
Waist-to-hip ratio calculator
Calculate your waist-to-hip ratio and assess cardiovascular health risk.
Biological age estimator
Estimate your biological age based on lifestyle factors like sleep, exercise, diet and stress.
Chronotype calculator
Discover if you're a morning lark or night owl, and find your optimal sleep and wake times.
Quit smoking savings calculator
Calculate the money saved and health benefits recovered from quitting smoking.
Dehydration impact calculator
See how different levels of dehydration affect cognitive and physical performance.
VO₂ max & fitness age
Estimate VO₂ max from resting heart rate and calculate your fitness age.
BMI Prime & Ponderal Index calculator
Calculate BMI Prime (ratio vs healthy upper limit) and Ponderal Index for a more nuanced body composition measure.
Body surface area (BSA) calculator
Calculate body surface area using the Mosteller formula — commonly used in drug dosing.
Calorie deficit & weight loss timeline
Calculate the daily calorie deficit needed to reach your goal weight and how long it will take.
Daily protein needs calculator
Calculate how much protein you need each day based on your weight, activity level, and goals.