BMR calculator
The energy your body burns at rest, estimated via Mifflin-St Jeor and Harris-Benedict — as an honest range, because formulas disagree.
BMR depends only on sex, age, height and weight — not on your activity (that's the TDEE).
This is your expenditure at rest. For your real need, multiply it by your activity level (TDEE). Formulas differ by a few dozen kcal — hence a range.
What is basal metabolic rate?
Basal metabolic rate (BMR) is the energy your body burns at complete rest, just to stay alive. It accounts for 60 to 75% of your daily expenditure — the starting point of any calorie calculation.
It's your minimum expenditure. Even lying down all day, your body uses this energy for the heart, brain, breathing and organs. Eating below it long-term pushes the body to slow down.
Formulas disagree. Mifflin-St Jeor and Harris-Benedict can differ by 50 to 150 kcal for the same profile. None knows YOUR exact metabolism — that's why we show a range, not a fake number.
From rest to real: TDEE. Your true daily need = BMR \u00d7 your activity level. BMR is the base of the calculation, not your calorie target.