Lean Body Mass Calculator

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Calculate lean body mass from weight and height using the Boer formula.

Inputs

Sex

Weight (kg)

Height (cm)

How to use this calculator: Lean Body Mass Calculator

Calculate lean body mass from weight and height using the Boer formula. The example below is calculated by this page's real engine from the displayed inputs.

1Confirm that the Lean Body Mass Calculator matches the quantity or design check you need.
2Enter Weight and Height using the units printed beside each field.
3Select the applicable Sex options; these choices change the calculation method or factors.
4Calculate, then follow the substituted equations in the worked example and compare the result with any stated limit.
5Read the assumptions, warnings and cited references before using the result for a financial, medical or engineering decision.

Input guide and example values

Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.

Input	Example value	Why it matters
Sex	Male	Select the option that matches the real installation or scenario.
Weight	70 kg	Measured or known weight used by the calculation engine.
Height	172 cm	Measured or known height used by the calculation engine.

Formula inputs & variables for Lean Body Mass Calculator

These are the named quantities used by this calculator. When the source formula does not define a mathematical symbol, OneCalcApp keeps the real input label instead of inventing one.

Variable / input	Unit	Meaning in this calculation
Sex	—	Select the option that matches the real installation or scenario.
Weight	kg	Measured or known weight used by the calculation engine.
Height	cm	Measured or known height used by the calculation engine.

How the Lean Body Mass Calculator works

The Lean Body Mass Calculator uses Sex, Weight, and Height to calculate Lean body mass, Fat mass, and Lean share. Its engine applies Men: LBM = 0.407w + 0.267h − 19.2; the worked values below come from that same live calculation rather than a separately typed example.

With Sex Male, Weight 70 kg, and Height 172 cm, the main worked-example result is Lean body mass = 55.2 kg.

How each Lean Body Mass Calculator input is used

Sex

The Lean Body Mass Calculator worked example selects “Male”. Available choices include Male and Female. This selection may change the method or factor used by the engine, so choose the option that matches the real case.

Weight

The Lean Body Mass Calculator worked example uses Weight = 70 kg. This value is passed directly into the calculation, with an allowed minimum 0.

Height

The Lean Body Mass Calculator worked example uses Height = 172 cm. This value is passed directly into the calculation, with an allowed minimum 0.

Lean Body Mass Calculator formulas and result interpretation

Formula 1: relationship used

In the Lean Body Mass Calculator, Men: LBM = 0.407w + 0.267h − 19.2. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

Formula 2: relationship used

In the Lean Body Mass Calculator, Women: LBM = 0.252w + 0.473h − 48.3. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

Lean body mass

For the displayed Lean Body Mass Calculator worked example, Lean body mass is 55.2 kg. Verify Sex, Weight, and Height and their units before relying on this output.

Fat mass

For the displayed Lean Body Mass Calculator worked example, Fat mass is 14.8 kg. Verify Sex, Weight, and Height and their units before relying on this output.

Lean share

For the displayed Lean Body Mass Calculator worked example, Lean share is 78.9%. Verify Sex, Weight, and Height and their units before relying on this output.

Lean Body Mass Calculator accuracy, checks and limitations

Lean Body Mass Calculator units check: confirm Sex, Weight (kg), and Height (cm) before calculating.
Lean Body Mass Calculator result check: compare Lean body mass, Fat mass, and Lean share with the substituted formula steps and the displayed rounding precision.
Lean Body Mass Calculator: This is a general estimate, not a diagnosis or personal medical advice. Discuss health decisions with a qualified clinician.

Formula, derivation and worked example

Lean body mass is everything that is not fat: muscle, bone, organs and water. It is the number that protein targets and many drug doses are based on, and it should stay steady while you lose fat.

Men: LBM = 0.407w + 0.267h − 19.2

Women: LBM = 0.252w + 0.473h − 48.3

Substitution steps

1. Boer formula
0.407w + 0.267h − 19.2
= 55.2 kg

Computed example results

Lean body mass: 55.2 kg
Fat mass: 14.8 kg
Lean share: 78.9%

Understanding the result

Read the main result together with supporting checks, assumptions, limits and intermediate values.

For a manual check, repeat the first equation, confirm the units and change one input at a time.

Assumptions and calculation scope

Weight is assumed to be entered in kg; converting from another unit before entry avoids changing the numerical meaning of the calculation.
Sex is assumed to match the real case. Choosing a different available option can change the method, factor or interpretation used by this calculator.
Lean Body Mass Calculator applies the displayed Men: LBM = 0.407w + 0.267h − 19.2 relationship to the entered health inputs. Factors that are not exposed as inputs or stated assumptions are outside this calculator's calculation scope.

Common mistakes when using Lean Body Mass Calculator

Do not mix units for Weight (kg), Height (cm). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
Do not leave Sex on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
Do not replace the displayed Men: LBM = 0.407w + 0.267h − 19.2 relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
Do not treat Lean body mass = 55.2 kg from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.

When the Lean Body Mass Calculator is useful

Lean Body Mass Calculator is designed for cases where Sex, Weight, Height are known and you need Lean body mass, Fat mass, Lean share. The page keeps the live calculator, calculation method and worked example together so the result can be checked instead of treated as a black-box number.

Use the calculator for the scope described by its inputs and notes. The displayed method is Men: LBM = 0.407w + 0.267h − 19.2. If the real project or decision needs factors that are not represented here, treat the result as an estimate and add the missing checks separately.

Sex and Weight: what changes the answer

The worked example uses Sex = Male, Weight = 70 kg, Height = 172 cm. With those values, Lean body mass is 55.2 kg. Changing an input should be interpreted according to that field's unit, range, option and hint rather than by the number alone.

For this calculator, the main input roles are: Sex: Select the option that matches the real installation or scenario. Available choices include Male, Female. Weight (kg): Measured or known weight used by the calculation engine. Height (cm): Measured or known height used by the calculation engine.

How to sanity-check a Lean Body Mass Calculator result

Start by confirming the entered values and units, then compare the substituted working with the displayed formula or calculation steps. Pay particular attention to Lean body mass, because it is the first worked-example output shown by the live engine.

Finally, compare the result with the assumptions, warnings and related calculators on this page. A nearby calculator can be useful as a cross-check when it measures the same workflow from a different input or output direction.

Next logical calculator

Continue with Body Fat Calculator

Useful next check because both tools use Sex and Weight, while Body Fat Calculator answers a different part of the same workflow.

Open Body Fat Calculator

Formula

Men: LBM = 0.407w + 0.267h − 19.2
Women: LBM = 0.252w + 0.473h − 48.3

Lean body mass is everything that is not fat: muscle, bone, organs and water. It is the number that protein targets and many drug doses are based on, and it should stay steady while you lose fat.

Frequently asked questions

What inputs does the Lean Body Mass Calculator use?

It uses Sex, Weight, and Height. Follow the unit printed for each field and choose any selectable option to match the real scenario.

What does the Lean Body Mass Calculator calculate?

It calculates Lean body mass, Fat mass, and Lean share. With the displayed default inputs, Lean body mass is 55.2 kg.

Which formula does the Lean Body Mass Calculator use?

The primary relationship is Men: LBM = 0.407w + 0.267h − 19.2. The page also shows substituted values and calculation steps so the result can be checked independently.

How can I verify a Lean Body Mass Calculator result?

First verify the units for Sex, Weight, and Height. Then compare the substituted formula steps with Lean body mass and its displayed precision.

What are the limitations of the Lean Body Mass Calculator?

Lean Body Mass Calculator: This is a general estimate, not a diagnosis or personal medical advice. Discuss health decisions with a qualified clinician.

Where can I find related Health tools?

Use the related-tools section on this page to compare another method, change units or continue the same health calculation.

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