Lean Body Mass = Total Body Weight – Body Fat Weight
Body Fat Weight = Total Body Weight × Body Fat Percentage
Lean Body Mass = Total Body Weight × (1 – Body Fat Percentage)
Convert body fat percentage to a decimal before calculating
Example: 150 lb × (1 – 0.20) = 120 lb lean body mass
Example: 70 kg × (1 – 0.25) = 52.5 kg lean body mass