Katch-McArdle BMR Calculator
BMR from lean body mass — often more accurate for lean or muscular people.
Lean mass is estimated with the Boer formula from height and weight, not medical advice — if you know your body fat percentage from a scan, your actual lean mass and this BMR may differ from the estimate. Consult a healthcare provider before making significant diet changes.
BMR (Katch-McArdle)
1,685 kcal
Estimated lean body mass
60.9 kg
For informational and educational purposes only — not medical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why lean mass beats total weight for some people
Muscle tissue burns meaningfully more energy at rest than fat tissue does, so two people at the same total weight but different body composition don't actually have the same metabolism — a weight-and-age formula like Mifflin-St Jeor can't see that difference, but a lean-mass-based formula can. Katch-McArdle, published by exercise physiologists William McArdle and Frank Katch, is generally considered more accurate for people who are noticeably muscular or lean, where the gap between "weight" and "lean mass" is largest; for people closer to average body composition, the two formulas tend to agree closely.
Frequently asked questions
Why use lean body mass instead of just height and weight?
Muscle tissue burns more calories at rest than fat tissue, so a formula based on lean mass rather than total weight tends to be more accurate for people who are notably lean or muscular, where standard formulas can underestimate metabolic rate.
How do I know my lean body mass to use this calculator?
Use the Lean Body Mass calculator, a body fat percentage measurement, or a body composition scan — this formula needs a reasonably accurate lean mass figure to be more precise than the standard Mifflin-St Jeor formula.