Your basal metabolic rate is the number of calories your body burns at complete rest — the energy needed just to keep your heart beating, lungs breathing and organs working. Knowing your BMR is the first step in any serious nutrition or fitness plan, because it sets the baseline for everything else.
This calculator uses the Mifflin-St Jeor equation, widely regarded as one of the most accurate BMR formulas for the general population. It then multiplies your BMR by an activity factor to estimate your total daily energy expenditure, the calories you actually burn in a typical day.
Should I eat my BMR or my TDEE? Eat below your TDEE to lose weight, at your TDEE to maintain, and above it to gain.
Is BMR the same for everyone? No. It depends on sex, age, height, weight and body composition.
Is my data private? Yes. All calculations happen in your browser.