Calculate Your Basal Metabolic Rate (BMR)
Basal metabolic rate (BMR) describes the energy your body uses to support essential functions while at rest. This free adult BMR calculator uses the Mifflin-St Jeor equation, a widely used predictive equation for resting energy expenditure.
Open the BMR CalculatorWhat information do you need?
Enter age, the equation reference (male or female), body weight in kilograms and height in centimetres. An optional activity selection estimates total daily energy expenditure (TDEE); it is distinct from BMR.
Formula used: Mifflin-St Jeor
Male: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5
Female: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
The equation estimates resting energy expenditure, not a direct laboratory measurement. Results can differ from an individual's actual energy needs. It is intended for adults and is not a diet prescription or medical advice.
Frequently asked questions
Is BMR the same as TDEE?
No. BMR estimates energy use at rest. TDEE estimates total daily energy expenditure after accounting for activity.
Should I eat exactly my BMR calories?
Not necessarily. BMR is not a recommended calorie target. Individual nutrition needs depend on health, activity, goals and other factors.
How accurate is the BMR calculator?
It provides an estimate from a predictive equation. Indirect calorimetry is needed to measure resting energy expenditure directly.
Calculate Your BMR on InfoJano