Fitness & gym calculators
Calculators for training and nutrition: body mass index, daily calories, macros, body fat, protein needs and strength. Each one shows the formula it uses, in US or metric units.
8 free tools
BMI Calculator
Enter your height and weight to get your body mass index, the adult category it falls in and the healthy weight range for your height.
Fitness
BMR Calculator
Estimate your basal metabolic rate — the calories your body uses at complete rest just to stay alive — from your age, sex, height and weight.
Fitness
TDEE Calculator
Find your total daily energy expenditure — how many calories you burn on an average day — and sensible targets for losing or gaining weight.
Fitness
Macro Calculator
Turn a daily calorie target into grams of protein, carbohydrate and fat — per day and per meal.
Fitness
Body Fat Calculator
Estimate your body fat percentage with a tape measure, using the same circumference method the US Navy uses.
Fitness
One Rep Max Calculator
Estimate the most you could lift for one rep from a lighter set you have already done — no risky max attempts needed.
Fitness
Protein Calculator
Work out a daily protein target from your body weight and goal, split across your meals.
Fitness
Ideal Weight Calculator
See the ideal body weight for your height from four classic formulas, alongside the healthy BMI range.
Fitness