Lean Body Mass Calculator
Calculate your lean body mass, fat mass, and lean-to-fat ratio from weight and body fat percentage.
How to Use the Lean Body Mass Calculator
- Enter your body weight in kilograms.
- Enter your body fat percentage.
- Click Calculate to see your lean body mass and fat mass.
- Review the lean-to-fat ratio and use the values to track body composition changes over time.
Quick Reference
| From | To |
|---|---|
| Men (healthy) | 15–20% body fat |
| Men (athletes) | 6–13% body fat |
| Women (healthy) | 20–25% body fat |
| Women (athletes) | 14–20% body fat |
| Essential fat (M) | 2–5% |
| Essential fat (F) | 10–13% |
Use Cases
- •Monitoring personal health metrics as part of a wellness routine.
- •Setting evidence-based goals for diet, exercise, or weight management.
- •Preparing for a medical appointment with baseline body measurements.
- •Tracking changes in body composition over time.
Formula
LBM = weight × (1 − body fat% / 100). Fat mass = weight × body fat% / 100.
Frequently Asked Questions
How to use?
Enter your weight and body fat percentage, then click Calculate to get your lean body mass and fat mass.
Calculation accuracy?
Calculations are performed with high precision.
Is it free?
Yes, all calculators are completely free.