Free fitness calculators

Calculate BMI, calories, macros and more. Free, no sign-up.

BMI calculator

Calculate your BMI (Body Mass Index) for free and see which range you fall in.

Calculate your BMR: how many calories your body burns at rest.

Find out how many calories per day to eat to maintain, lose fat, or gain muscle.

Calculate your protein, carb, and fat split for your goal.

Find out how many grams of protein to eat per day for your goal.

Find out how many liters of water to drink per day based on your weight.

Estimate your one-rep max (1RM) from a submaximal set.