Katch-McArdle
BMR from lean mass.
When to use: You have body composition (Navy, calipers, DEXA)—especially if you carry notable muscle mass.
Calculator
370 + 21.6×FFM
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Estimate, not medical advice.
Formula
BMR = 370 + 21.6 × FFM (kg). FFM = mass × (1 − bodyFat%/100).