Lean Body Mass Calculator

Calculate your lean body mass — the weight of everything in your body except fat.

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Frequently Asked Questions

Q.What is lean body mass?

LBM is the weight of muscles, bones, organs, and water — everything except body fat. It determines your BMR and metabolic rate.

Q.What is a healthy lean body mass percentage?

For men: 80-90% LBM is healthy. For women: 75-85%. Athletes typically have higher LBM percentages due to more muscle mass.