Complete guide
Lean Body Mass Calculator: formula, worked example and interpretation
Estimate adult lean body mass with the sex-specific Boer height-and-weight equations. Enter the known values and the result updates instantly with an auditable breakdown.
What the Lean Body Mass Calculator answers
Estimate adult lean body mass with the sex-specific Boer height-and-weight equations.
Use the breakdown to compare the result with the source values before making a decision.
Formula and variables
The calculation uses male LBM=0.407W+0.267H−19.2; female LBM=0.252W+0.473H−48.3. Every variable comes directly from a labeled field.
male LBM=0.407W+0.267H−19.2; female LBM=0.252W+0.473H−48.3Worked example
A 165 cm, 70 kg adult using the female equation has an estimated lean mass near 47.4 kg.
Changing any field recalculates the result immediately, so nearby scenarios can be compared without reloading the page.
How to use the result
Treat the result as a planning value and compare it with the detailed rows shown beside it.
Keep units and time periods consistent. Use the share or PDF action to preserve the exact assumptions.
Assumptions and scope
This anthropometric estimate is not a direct body-composition measurement and may be inaccurate outside the studied adult ranges.
The calculator exposes its assumptions instead of filling missing facts with hidden estimates.
Accuracy checks
Confirm the units, dates, rates and source figures before relying on the output.
Round only the displayed answer; Calculator24 keeps full JavaScript precision for intermediate arithmetic and exported values.
Input and output checklist
| Item | What to enter or review |
|---|---|
| Inputs | Equation sex, Height (cm), Weight (kg) |
| Equation | male LBM=0.407W+0.267H−19.2; female LBM=0.252W+0.473H−48.3 |
| Example | A 165 cm, 70 kg adult using the female equation has an estimated lean mass near 47.4 kg. |
| Limit | This anthropometric estimate is not a direct body-composition measurement and may be inaccurate outside the studied adult ranges. |
Frequently asked questions
What does this Lean Body Mass Calculator calculate?
Estimate adult lean body mass with the sex-specific Boer height-and-weight equations.
Which formula does it use?
male LBM=0.407W+0.267H−19.2; female LBM=0.252W+0.473H−48.3
Does the result update while I type?
Yes. Valid changes recalculate after a short delay and the previous result is not substituted for invalid input.
Which assumptions should I check?
Check units, rates, dates and every source value shown in the form.
Is the result exact?
This anthropometric estimate is not a direct body-composition measurement and may be inaccurate outside the studied adult ranges.
Can I save or share the calculation?
Yes. Copy, Share, WhatsApp, PDF/Print, CSV, comparison and parameterized-link actions are available.
What to keep in mind
This anthropometric estimate is not a direct body-composition measurement and may be inaccurate outside the studied adult ranges.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.