How do you work out how much of your weight is muscle?

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take your body fat percentage and add 10% to it (about the weight of your muscle), turn that number into a fraction ( ie. 30% would = 0.30) and multiply it by you body weight. This gives you a rough estimate of your non-muscle weight. Subtract this number from your total body weight and you will have your muscle weight.

(Body Weight) - (Body Weight x [% Body fat + 10% bone]) = muscle ...Show more