Find out how much of your weight is lean mass — muscle, bone, water, and organs.
Lean body mass is your total weight minus your body fat. It includes your muscles, bones, organs, skin, and water. Knowing your LBM helps you set more accurate fitness and nutrition goals.
This calculator uses the Boer formula, which is widely used in clinical settings. For most people it is accurate to within a few pounds of measured lean mass.
This calculator is for general informational purposes only. It is not a substitute for professional medical advice.