BMR Calculator (Basal Metabolic Rate)
Find out how many calories your body burns at complete rest. Compare the Mifflin-St Jeor, revised Harris-Benedict, and Katch-McArdle formulas side by side, in metric or imperial units.
Three Validated Formulas
Mifflin-St Jeor is the primary result — the most validated equation for the general population. Add your body fat percentage to unlock Katch-McArdle, which estimates BMR from lean body mass and is often more accurate for athletic builds.
From BMR to Daily Calories
BMR is only your resting baseline. To plan calorie targets for weight loss or muscle gain, multiply it by your activity level with the TDEE Calculator.