Katch-McArdle Calculator
BMR from lean mass, not total weight.
Private by design — everything is calculated on your device, nothing is storedTry: Weight=75, Body fat=18 → 75 kg, 18 %, 61.5 kg, 1,698 kcal
How to use
Katch-McArdle estimates BMR from lean body mass, which is the metabolically active tissue. It is most useful when you already know body fat.
Formula
BMR = 370 + 21.6 × lean mass, lean mass = weight × (1 − body fat/100).
FAQ
Advantage over Mifflin?
Two people of the same weight but different body fat get different BMRs.
Need an accurate body-fat %?
Yes — garbage in, garbage out. Use a measured value if possible.
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