Health & fitness
Lean Body Mass Calculator
Estimate lean body mass, fat mass, and lean-mass share from height, weight, and sex using a standard formula-based method.
Interactive calculator
Estimate lean body mass from height and weight
Use a sex-specific formula to estimate lean body mass, fat mass, and the lean share of current body weight.
Estimated split
Lean mass versus non-lean mass
This split reflects the formula estimate of lean mass versus non-lean mass at the current body weight.
Lean mass
60.1 kg
Estimated fat mass
17.9 kg
Results
Lean body mass
60.1 kg
Estimated fat mass
17.9 kg
Lean mass share
77%
How to use it
- 01Select sex and enter your body weight and height.
- 02Review the estimated lean body mass and estimated non-lean mass.
- 03Use the lean-mass share as a rough comparison point, not a medical diagnosis.
Result guide
- Lean body mass is estimated, not directly measured.
- The result is most useful as a general reference or trend check, not as a precise body-fat assessment.
- For more measurement-driven composition estimates, the body-fat calculator provides a different approach.
About this calculator
Lean-body-mass pages are useful because many people want a rough body-composition reference without taking full circumference measurements or using calipers.
This calculator stays honest about scope: it is a formula estimate, not a lab-grade composition measurement.
Frequently asked questions
How is this different from body fat percentage?
Lean body mass estimates the amount of non-fat mass, while body-fat percentage focuses on the fat share of total body weight.
Is this as accurate as a scan or lab test?
No. It is a simpler formula-based estimate and should not be treated as equivalent to DEXA or other clinical methods.
Why might the estimate differ from what my scale says?
Different devices and formulas use different assumptions, so body-composition estimates often vary across methods.
Method and limitations
This calculator uses the formula and assumptions described on this page. We do not claim independent professional review. Direct references will be listed here when they support a specific rule or data source used by this calculator.
Results are estimates for general information. Verify current rules and assumptions before making financial, tax, or health decisions.
Read our Editorial and Verification Policy →Related calculators
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