Estimate your lean body mass, the weight of everything in your body except fat, using the widely used Boer formula.
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Lean body mass (LBM) is your total body weight minus fat mass, everything else, muscle, bone, organs, connective tissue and water. This calculator uses the Boer formula, one of the most widely cited equations for estimating LBM from just height and weight, without needing a direct body fat measurement: for men, LBM = 0.407 × weight (kg) + 0.267 × height (cm) − 19.2, and for women, LBM = 0.252 × weight (kg) + 0.473 × height (cm) − 48.3.
Lean body mass is often used as a more accurate basis than total body weight for things like protein intake recommendations, medication dosing, and tracking body composition changes during training, since two people at the same weight can have very different amounts of muscle versus fat, and it's often the lean mass that's more relevant to these calculations.
For example, a man 175 cm tall weighing 70 kg has an estimated lean body mass of 0.407 × 70 + 0.267 × 175 − 19.2 = 56.0 kg, leaving about 14.0 kg of estimated fat mass, or a lean mass percentage of 80%.
Treating the Boer formula's estimate as precise enough for clinical decisions, it's a population-based approximation from height and weight alone, not a substitute for DEXA or hydrostatic measurement when precision actually matters.
Using this figure interchangeably with the Body Fat Calculator's result without realizing they come from entirely different formulas, small discrepancies between the two are expected, not a sign either is wrong.
Not accounting for very muscular or very lean individuals, height-and-weight-only formulas like Boer's are less accurate at the extremes of muscle mass than for an average build.
Formula-based estimates like the Boer formula are reasonably accurate for most people but are still estimates, not direct measurements. Methods like DEXA scans or hydrostatic weighing give more precise results if you need clinical-grade accuracy.
Men and women have different average proportions of muscle, bone density and body water, so the Boer formula uses different coefficients for each to produce more accurate estimates.
The Body Fat Calculator estimates your body fat percentage directly from circumference measurements (neck, waist, hip). This calculator estimates lean mass from height and weight alone, using a different formula that doesn't require any circumference measurements.
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