Skeletal Muscle Mass Calculator (Lee Equation)
Whole-body skeletal muscle (not just 'lean mass') via the MRI-validated Lee 2000 anthropometric equation.
Lean body mass includes organs, bone and water; skeletal muscle is typically only 35–45% of body weight in men and 30–40% in women. Lee's equation was validated against whole-body MRI — the gold standard for muscle — making it the best tape-free estimate of actual muscle tissue.
Formula
For general information only — not medical advice, a diagnosis or a treatment plan. Consult a qualified healthcare professional before making health, diet, medication or exercise decisions.
Whole-body skeletal muscle (not just 'lean mass') via the MRI-validated Lee 2000 anthropometric equation. The Skeletal Muscle Mass Calculator (Lee Equation) is a free, private skeletal muscle mass tool — every result computes instantly in your browser with no sign-up and no data upload.
About Skeletal Muscle Mass Calculator (Lee Equation)
Lean body mass includes organs, bone and water; skeletal muscle is typically only 35–45% of body weight in men and 30–40% in women. It applies SMM = 0.244·W + 7.80·H(m) − 0.098·age + 6.6·sex + ancestry − 3.3. Use the Skeletal Muscle Mass Calculator (Lee Equation) 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 Skeletal Muscle Mass Calculator (Lee Equation)
- 1Enter your details in the Skeletal Muscle Mass Calculator (Lee Equation) 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 Skeletal Muscle Mass Calculator (Lee Equation)?
- ✓Instant skeletal muscle mass 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 (Lee RC et al., Am J Clin Nutr 2000;72:796-803)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Skeletal Muscle Mass Calculator (Lee Equation) work?+
Lean body mass includes organs, bone and water; skeletal muscle is typically only 35–45% of body weight in men and 30–40% in women. The calculation uses the formula: SMM = 0.244·W + 7.80·H(m) − 0.098·age + 6.6·sex + ancestry − 3.3. Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Skeletal Muscle Mass Calculator (Lee Equation) accurate, and what is it based on?+
The method is traceable to authoritative sources: Lee RC et al., Am J Clin Nutr 2000;72:796-803. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Skeletal Muscle Mass Calculator (Lee Equation) 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 information only and is not medical advice. Always consult a qualified healthcare professional before making health decisions.
What can I use the Skeletal Muscle Mass Calculator (Lee Equation) for?+
It's commonly used for skeletal muscle mass, smm calculator, lee equation. Whole-body skeletal muscle (not just 'lean mass') via the MRI-validated Lee 2000 anthropometric equation.
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