Estimate your fat-free mass using the Boer formula.
Lean body mass (LBM) is the weight of everything in your body except fat: muscle, bone, organs, water, and connective tissue. It is a better predictor of metabolic rate and athletic performance than total body weight.
This calculator uses the Boer formula, which is accurate within ±3–4% for most adults. For more precise measurements, methods like DEXA scanning or underwater weighing can be used.