Work out bmr (katch mcardle) instantly with clear inputs, formula shown and shareable results.
Applies the Katch-McArdle equation, which predicts basal metabolic rate from lean body mass alone and so suits lean or muscular people best.
Katch-McArdle
BMR = 370 + 21.6 x lean body mass (kg), where lean mass = weight x (1 - body fat fraction)
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
When a reliable body composition measurement exists, especially in athletes where weight-based equations misfire.
Fat tissue is metabolically quiet, so almost all resting energy expenditure comes from lean tissue and organs.