Health & Fitness

Lean body weight equation

Lean body weight equation: calculation method, required inputs, worked check, limitations and a link to Lean Body Mass Calculator. Reviewed 25 September 2026.

By Uddhav Gopani, FounderPublished 25 September 2026Reviewed 25 September 2026

For “Lean body weight equation”, the linked Lean Body Mass Calculator is relevant because Estimate lean body mass — everything in your body except fat — using the Boer formula.

What this specific question is asking

Treat the output as a consequence of the setup. For this query the setup is weight (kg), height (cm) and sex — verify each for unit, period and meaning, then let Lean Body Mass Calculator do the arithmetic.

Validate by perturbation: nudge weight (kg) by ten percent and watch the output. A result that barely moves — or jumps wildly — usually means a wrong unit or period, not a broken formula.

Inputs to verify

Verify weight (kg) before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify height (cm) before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify sex before calculation; if this value uses a different unit, period or definition, convert or restate it first.

Step-by-step check

Enter your current body weight in kilograms.
Provide your height in centimetres for the Boer formula.
Select your sex for the correct Boer coefficients.
Press Calculate to see your estimated lean body mass.

Worked example and sanity check

As a worked reference for “Lean body weight equation”, Worked example For an 80 kg male at 18% body fat: lean mass = 80 × (1 − 0.18) = 65.6 kg .

Interpreting the result

Interpretation starts with magnitude. The worked example landed at 80 × (1 − 0; compare yours before trusting the decimals. If the two disagree wildly, the setup — usually weight (kg)'s unit or period — is the suspect. Treat the number as a screening estimate for orientation, not a diagnosis or a personalised prescription; individual measurement error and physiology dominate any formula's precision.

Reviewed 25 September 2026

Verify any current tax threshold, lender rate, provider rule or health guidance with the authoritative source before acting.

Use the Lean Body Mass Calculator

Open Lean Body Mass Calculator

Common questions

Which inputs matter most for lean body weight equation?

The key inputs are Weight (kg), Height (cm), Sex. Match their units and periods before using Lean Body Mass Calculator.

How can I check an answer for lean body weight equation?

Run the example exactly as written, then vary weight (kg) alone. A result that tracks that change predictably tells you the setup — units, periods, definitions — is correct.

When should I recalculate lean body weight equation?

Re-run it when the real-world inputs move — new measurements, changed rates or thresholds, or a different unit convention on the same quantity.