Lean Body Mass Calculator (Boer Formula)
Estimate fat-free mass from height and weight.
Enter your values
ⓘ Live results
Results
- Lean body mass
- 60.9 kg
- Estimated fat mass
- 19.1 kg
- Body fat %
- 23.9%
- Lean mass %
- 76.1%
Quick answer
Lean body mass is total weight minus estimated fat mass, calculated from the Boer formula.
Men: LBM = 0.407W + 0.267H - 19.2; Women: LBM = 0.252W + 0.473H - 48.3
How to use the Lean Body Mass Calculator (Boer Formula)
- 1Enter sex, weight and height.
- 2The Boer formula estimates fat-free mass from body size alone.
- 3This is an estimate — it does not measure your actual composition. For precise numbers use DEXA or hydrostatic weighing.
Worked example
Using the values the calculator loads with:
Inputs
- SexMale
- Weight80 kg
- Height178 cm
Results
- Lean body mass60.9 kg
- Estimated fat mass19.1 kg
- Body fat %23.9%
- Lean mass %76.1%
Frequently asked questions
Is Boer accurate?
It correlates well at a population level but can be off by a few kg for individuals with unusual builds.
Why does it matter?
Lean mass drives your resting calorie burn and protein needs more than total weight does.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.