Lean Body Mass Calculator
Your lean body mass is your total body weight minus your body fat weight. It includes muscle, bone, organs, water, and other fat-free tissues. Enter your measurements and weight below to calculate both your body fat percentage and lean body mass.
Disclaimer: This is an estimate based on the U.S. Navy
circumference method and is less accurate than clinical methods like DEXA
scans or hydrostatic weighing. It is not medical advice.
Sex:
Unit:
Enter your measurements above to calculate your estimated body fat percentage and lean body mass.
What Is Lean Body Mass?
Lean body mass (LBM), also known as fat-free mass, is the weight of everything in your body except fat. This includes:
- Skeletal muscle
- Bones
- Organs
- Water
- Connective tissue
Knowing your lean body mass can help you set realistic fitness goals and track changes in body composition over time. Unlike the scale alone, LBM helps you distinguish between fat loss and muscle gain.
If you only need body fat percentage without the weight input, try our Body Fat Percentage Calculator .