Katch–McArdle BMR Calculator (Lean-Mass Based)
BMR from lean body mass (370 + 21.6 × LBM) — the equation of choice when you know your body-fat percentage.
Because lean tissue drives most resting energy use, Katch–McArdle ignores age and sex entirely and keys on lean mass — it shines for athletic people whose muscle mass breaks weight-based equations. Its accuracy is only as good as the body-fat estimate you feed it.
Formula
For general information only — not medical or training advice. Estimates vary between individuals; consult a qualified professional before changing your exercise or nutrition routine.
BMR from lean body mass (370 + 21.6 × LBM) — the equation of choice when you know your body-fat percentage. The Katch–McArdle BMR Calculator (Lean-Mass Based) is a free, private katch mcardle tool — every result computes instantly in your browser with no sign-up and no data upload.
About Katch–McArdle BMR Calculator (Lean-Mass Based)
Because lean tissue drives most resting energy use, Katch–McArdle ignores age and sex entirely and keys on lean mass — it shines for athletic people whose muscle mass breaks weight-based equations. It applies BMR = 370 + 21.6 × LBM(kg); LBM = weight × (1 − BF%). Use the Katch–McArdle BMR Calculator (Lean-Mass Based) to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Katch–McArdle BMR Calculator (Lean-Mass Based)
- 1Enter your details in the Katch–McArdle BMR Calculator (Lean-Mass Based) input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Katch–McArdle BMR Calculator (Lean-Mass Based)?
- ✓Instant katch mcardle result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (McArdle WD, Katch FI & Katch VL — Exercise Physiology, 8th ed.)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Katch–McArdle BMR Calculator (Lean-Mass Based) work?+
Because lean tissue drives most resting energy use, Katch–McArdle ignores age and sex entirely and keys on lean mass — it shines for athletic people whose muscle mass breaks weight-based equations. The calculation uses the formula: BMR = 370 + 21.6 × LBM(kg); LBM = weight × (1 − BF%). Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Katch–McArdle BMR Calculator (Lean-Mass Based) accurate, and what is it based on?+
The method is traceable to authoritative sources: McArdle WD, Katch FI & Katch VL — Exercise Physiology, 8th ed.. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Katch–McArdle BMR Calculator (Lean-Mass Based) free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is for general fitness information only, not medical or training advice. Consult a professional before changing your routine.
What can I use the Katch–McArdle BMR Calculator (Lean-Mass Based) for?+
It's commonly used for katch mcardle, bmr lean mass, bmr body fat. BMR from lean body mass (370 + 21.6 × LBM) — the equation of choice when you know your body-fat percentage.
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