Lean Body Mass Calculator
Fill in the values and the answer updates as you type.
How the Lean Body Mass Calculator works
Uses the Boer formula. Men: 0.407 × weight + 0.267 × height − 19.2. Women: 0.252 × weight + 0.473 × height − 48.3. It is an estimate; body scans measure composition far more precisely.
Inputs and results
The Lean Body Mass Calculator takes 3 inputs and gives 3 results.
What you enter
- Sex — starts at Male. Choose from: Male and Female.
- Weight (kg) — starts at 70.
- Height (cm) — starts at 175.
What you get
- Lean body mass (kg)
- Fat mass (kg)
- Lean mass share
Example: Lean Body Mass Calculator with the starting values
With sex Male, weight 70 kg and height 175 cm, the calculator returns:
| Lean body mass (kg) | 56 |
|---|---|
| Fat mass (kg) | 14 |
| Lean mass share | 80.02% |
Change any value above and the results update straight away.
Lean Body Mass Calculator FAQ
How do I use the Lean Body Mass Calculator?
Enter sex, weight and height in the fields, then read lean body mass (kg), fat mass (kg) and lean mass share in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Lean Body Mass Calculator calculate?
Estimate lean mass and fat mass with the Boer formula. It returns lean body mass (kg), fat mass (kg) and lean mass share from the 3 values you provide.
What values does the Lean Body Mass Calculator start with?
It opens with sex Male, weight 70 kg and height 175 cm so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Lean Body Mass Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Lean Body Mass Calculator for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.