Overview
What Is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to maintain basic life functions like breathing and circulation.
Calculate your Basal Metabolic Rate instantly.
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to maintain basic life functions like breathing and circulation.
Useful as a foundation for calorie planning - your total daily needs build on top of this baseline.
Input age, sex, height, and weight.
The result updates automatically.
BMR is calories burned at complete rest; total daily calories add activity level on top of BMR. See our calorie calculator for total needs.
Using the Mifflin-St Jeor equation, based on age, sex, height, and weight.
Yes, more muscle mass generally increases BMR since muscle tissue burns more calories at rest than fat tissue.
Yes, BMR typically declines gradually with age, partly due to natural muscle loss.
No, BMR varies by age, sex, height, and individual metabolic factors, not weight alone.
No, eating only your BMR would not account for any daily activity - use your total daily calorie needs (BMR × activity factor) instead.
It's a well-established estimate - individual metabolism can vary somewhat from the formula's prediction.
No, calculations happen entirely in your browser.
This calculator is designed for adults - children have different metabolic calculation needs.
Yes, completely free with no sign-up required.