Compare adult Boer, James and Hume lean-mass estimates with a separately entered body-fat-derived value, without treating regressions as measurements.
01 / PURPOSE-SPECIFIC INPUTS
Regression outputs are estimates, not measured body composition or medical diagnoses. Historical sex parameters select equation coefficients, not gender identity. Physically impossible estimates are flagged rather than clipped.
02 / RESULT & SUPPORTING WORK
Adult informational estimates only, not diagnosis or body-image judgments. Historical sex parameters select published coefficients, not gender identity. Measurements do not remove model uncertainty.
| Method | Lean kg | Lean lb | Lean % / status |
|---|---|---|---|
| Boer | 61.42 | 135.41 | 76.78% |
| James | 62.72 | 138.27 | 78.4% |
| Hume | 57.79 | 127.4 | 72.23% |
| Body-fat-derived | Not supplied | Not interpreted | Not supplied |
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The comparison separates anthropometric regressions from a value derived directly from entered body-fat percentage. Impossible equation values remain visibly flagged and are not converted into misleading fat percentages.
Compare Boer, James, Hume and entered-body-fat results in kg/lb with usable-domain flags and an explicit spread of estimates.
Lean Body Mass Calculator inputs and calculations remain in browser memory. No external processing API receives entered measurements, formulas, dates or financial values. Ordinary website page requests may still be logged. Clipboard access occurs only when you choose Copy Result.
Adult Boer, James and Hume regressions use weight in kilograms and height in centimeters with their stated historical sex coefficients. A separate direct method uses entered body-fat percentage: lean mass = weight times (1 − body-fat percentage/100).
No. Anthropometric equations are regression-based estimates. Even the direct method derives its result from an independently entered body-fat measurement and does not perform a new measurement.
An estimate below zero or above total body mass is flagged outside its useful domain. It is never silently clipped, and an implied fat mass or lean percentage is not interpreted from that impossible value.
The calculation uses the exact defined factor 1 lb = 0.45359237 kg. For example, 100 kg is approximately 220.462262 lb. Display rounding does not change the internal equation inputs.
The calculator limits age to adults 18–120. Very unusual weight, height or anthropometric combinations are flagged for limited model usefulness; these are software interpretation bounds, not clinical diagnoses.
It selects a coefficient set from the stated equation, not a gender-identity assessment. The output is informational only and does not diagnose health, prescribe weight changes or judge body appearance.