What equation does this use?

It uses the Mifflin-St Jeor equation, widely regarded as the most accurate predictive formula for resting metabolic rate. RMR is the calories your body burns at rest to maintain basic functions.

What is the difference between RMR and TDEE?

RMR is the energy you burn at complete rest. Total daily energy expenditure (TDEE) multiplies your RMR by an activity factor to include movement and exercise, giving the calories needed to maintain your current weight.

Is any data uploaded?

No. The calculation runs entirely in your browser and nothing is stored or sent anywhere.

Resting Metabolic Rate Calculator

Resting metabolic rate calculator

Enter your sex, age, height, weight and activity level to estimate your resting metabolic rate (RMR), your total daily energy expenditure (TDEE) and simple calorie targets for losing or gaining weight.

This calculator uses the Mifflin-St Jeor equation, the most validated formula for predicting RMR. Actual metabolism varies with body composition and genetics, so treat the numbers as a starting point, not medical or dietary advice. Everything is calculated privately in your browser.