How is this different from LBM?

LBM includes organs, water and connective tissue. Skeletal muscle is just the muscles attached to bones, the part that grows with training.

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Skeletal Muscle Mass Calculator

Estimate skeletal muscle mass from lean body mass. Skeletal muscle is roughly half of LBM in untrained adults.

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Weight (kg)

Lean body mass (kg)

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How is this different from LBM?: LBM includes organs, water and connective tissue. Skeletal muscle is just the muscles attached to bones, the part that grows with training.