The BMR Calculator estimates your Basal Metabolic Rate — the calories your body burns at complete rest — using the accurate Mifflin-St Jeor equation. It then applies your activity level to estimate your daily maintenance calories (TDEE).
BMR and daily calorie needs
Your Basal Metabolic Rate is the energy your body uses just to keep you alive at rest. Multiplying it by an activity factor gives your Total Daily Energy Expenditure (TDEE) — roughly the calories you burn in a typical day.
Knowing these numbers is the foundation for planning weight loss, maintenance or gain.
How it's calculated
- Uses the modern Mifflin-St Jeor equation
- Accounts for age, sex, height and weight
- Five activity levels from sedentary to very active
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