Lean body mass (LBM)
Estimate your lean and fat mass from sex, height and weight.
- Instant
- Free
- Private (processed locally)
- No sign-up
Estimate your body composition
Pick the sex, enter height and weight: the tool estimates your lean body mass, fat mass and body fat percentage, with a split bar.
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Sex
Male or female.
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Height and weight
In cm and kg.
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Read the result
Lean + fat mass.
Boer formula
- Male: 0.407 × weight + 0.267 × height − 19.2
- Female: 0.252 × weight + 0.473 × height − 48.3
- Fat mass = weight − lean mass
- Weight in kg, height in cm
Example: male, 175 cm, 75 kg
| Item | Value |
|---|---|
| Lean body mass | 58.1 kg |
| Fat mass | 16.9 kg |
| Body fat | 22.6% |
Estimate via the Boer formula, for educational purposes. For a precise measurement, consult a professional.
Frequently asked questions
What is lean body mass?
It is everything that is not fat: muscle, bone, organs, body water. It is also called fat-free mass (FFM).
Which formula is used?
The Boer formula (1984). Male: 0.407 × weight + 0.267 × height − 19.2. Female: 0.252 × weight + 0.473 × height − 48.3 (weight in kg, height in cm).
What is the number for?
To track body composition, estimate protein needs or lean-mass-based dosing. It is an estimate, not an exact measurement.
Is this medical advice?
No. For a precise measurement (DEXA, bioimpedance), consult a professional.