Lean Body Mass Calculator
Your lean body mass (LBM) is everything in your body except fat - including muscle, bone, organs, and water. Knowing your LBM helps you set realistic protein targets, track muscle gain during body recomposition, and understand your body composition beyond the scale.
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Enter your details
Leave blank to use the Boer formula only
Your Lean Body Mass
ExampleExample figures, not your own. Worked for a man of 80 kg and 175 cm with no body fat percentage entered. Enter your own details and press Calculate.
Lean Body Mass (Boer)
60.1kg
75% of body weightTotal Weight
80.0kg
How It Works
This calculator offers two methods. The Boer formula estimates LBM from height and weight alone: Men = 0.407 x weight + 0.267 x height - 19.2; Women = 0.252 x weight + 0.473 x height - 48.3. Alternatively, if you know your body fat percentage, LBM = weight x (1 - body fat / 100).
How to use it
- 1Select your gender
- 2Enter your weight in kilograms
- 3Enter your height in centimetres
- 4Optionally, enter your body fat percentage for a more precise calculation
- 5Click "Calculate" to see your lean body mass
Quick Reference
| Body Weight (kg) | Typical Male LBM (kg) | Typical Female LBM (kg) |
|---|---|---|
| 55 | 42-47 | 37-43 |
| 60 | 46-51 | 41-47 |
| 65 | 50-55 | 44-51 |
| 70 | 53-60 | 48-55 |
| 75 | 57-64 | 51-59 |
| 80 | 60-68 | 54-62 |
| 85 | 64-72 | 58-66 |
| 90 | 68-77 | 61-70 |
| 95 | 71-81 | 65-74 |
| 100 | 75-85 | 68-78 |
Ranges assume body fat of 10-22% for men and 18-32% for women.
Boer Formula (1984)
- W
- = body weight in kilograms
- H
- = height in centimetres
- BF
- = body fat percentage (optional)
The Boer formula is considered one of the most accurate LBM estimation formulas. If you know your body fat percentage, the body fat method is more precise.