Free Fitness Calculators

Accurate, science-backed calculators. No sign-up required.

nutrition

Calculate your Total Daily Energy Expenditure to know exactly how many calories you burn each day.

nutrition

Calculate your optimal protein, fat, and carbohydrate targets based on your TDEE and body composition.

nutrition

Calculate your Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.

nutrition

Calculate your cutting macros with a calorie deficit while protecting lean muscle mass.

nutrition

Calculate your bulking macros for lean, standard, or aggressive muscle gain.

Estimate your body fat percentage using the US Navy formula and BMI method.

body composition

Calculate your lean body mass and ideal body weight using Hamwi, Devine, and Robinson formulas.

Estimate your one rep max from any rep count using Epley, Brzycki, and Lombardi formulas.

performance

Estimate your VO2 max using the Rockport walk test, Cooper run test, or resting heart rate method.

performance

Calculate your Wilks score to compare powerlifting strength across bodyweights.