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Lean Body Mass Calculator

Use this lean body mass calculator to review an educational health calculation for lean body mass.

Primary answer
Estimated lean body mass
Inputs to verify
Age, Sex used by equation, and Height
Use type
Use as an estimate that depends on assumptions.
Keyword intent
lean body mass calculator

Calculator

Lean Body Mass Calculator

Calculates estimated lean body mass from age, sex used by equation, height. Defaults are filled in so you can review a working example before changing inputs.

years

Adult-only educational estimate; not for pediatric, pregnancy, or clinical dosing use.

Choose the published Boer coefficient set used for the estimate.

Use centimeters when height unit is cm, or total inches when height unit is in.

Choose centimeters or inches.

Use kilograms when weight unit is kg, or pounds when weight unit is lb.

Choose kilograms or pounds.

Result

Result reflects the current submitted inputs.

  • Risk B
  • Reviewed 2026-05-26
  • 3 sources
Estimated lean body mass66.3 kg
Estimated lean body mass146.1 lb
Estimated non-lean mass23.7 kg
Estimate noteAdult Boer-equation estimate only; not a body scan, medical diagnosis, medication-dosing weight, or nutrition prescription.

Breakdown

Weight used
90 kg
Height used
183 cm
Equation coefficient
male
  • This calculator is for adult educational estimates only and is not medical, medication-dosing, or nutrition advice.
  • The Boer equation uses binary male/female coefficients and does not model children, pregnancy, edema, amputations, medications, or medical conditions.
  • Metric and imperial inputs are normalized before calculation.
  • No intermediate rounding is applied; display output rounds to one decimal.

Accuracy notes

Risk level
B
Reviewed
2026-05-26
Sources
3
Primary result
Estimated lean body mass

Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.

Related calculators

Categories

What the result means

Use Estimated lean body mass as the headline answer for lean body mass. Boer lean body mass estimate rounded to one decimal for display. Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Use estimated non-lean mass and estimate note to explain why estimated lean body mass moved when an input changed. Record the inputs you used and verify any health concern with a qualified professional.

Estimated lean body massBoer lean body mass estimate rounded to one decimal for display.
Estimated lean body massLean body mass converted from kilograms to pounds.
Estimated non-lean massEntered weight minus estimated lean body mass.
Estimate noteVisible adult-use limitation and medical/dosing disclaimer.

Use the result this way

  1. Start with Estimated lean body mass, then use supporting outputs only to explain the primary answer.
  2. Verify age, sex used by equation, and height before copying the result.
  3. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.
  4. Record the inputs you used and verify any health concern with a qualified professional.

User job

How to use this calculator

Use Lean Body Mass Calculator when you need estimated lean body mass, then use estimated lean body mass and estimated non-lean mass to check the context for general wellness education and preparing for a professional conversation.

Best for

  • Understanding a formula-based estimate
  • Seeing which inputs drive a health-related output
  • Reviewing a default example before entering your own age and sex used by equation.

Check before relying

  • Health formulas can be population-specific; do not use the result as diagnosis or treatment advice.
  • This calculator is for adult educational estimates only and is not medical, medication-dosing, or nutrition advice.
  • The Boer equation uses binary male/female coefficients and does not model children, pregnancy, edema, amputations, medications, or medical conditions.
  • Source context: American Journal of Physiology / PubMed, reviewed 2026-05-26.

Next useful step

  • Body Fat CalculatorUse next when the body metric task needs estimated body fat instead of estimated lean body mass.
  • Ideal Weight CalculatorUse next when the body metric task needs devine estimate instead of estimated lean body mass.
  • BMR CalculatorUse next when the body metric task needs estimated BMR instead of estimated lean body mass.

Formula

Lean body mass uses the Boer equation after normalizing weight to kilograms and height to centimeters. Key assumptions: This calculator is for adult educational estimates only and is not medical, medication-dosing, or nutrition advice. The Boer equation uses binary male/female coefficients and does not model children, pregnancy, edema, amputations, medications, or medical conditions. Metric and imperial inputs are normalized before calculation.

  • Lean body mass uses the Boer equation after normalizing weight to kilograms and height to centimeters.
  • This calculator is for adult educational estimates only and is not medical, medication-dosing, or nutrition advice.
  • The Boer equation uses binary male/female coefficients and does not model children, pregnancy, edema, amputations, medications, or medical conditions.
  • Primary source context: American Journal of Physiology / PubMed.

Inputs

Enter age, sex used by equation, height, and height unit for general wellness education and preparation for a professional conversation. Before calculating, choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges. Age: Adult-only educational estimate; not for pediatric, pregnancy, or clinical dosing use. Sex used by equation: Choose the published Boer coefficient set used for the estimate. Height: Use centimeters when height unit is cm, or total inches when height unit is in. Height unit: Choose centimeters or inches.

AgeAdult-only educational estimate; not for pediatric, pregnancy, or clinical dosing use.
Sex used by equationChoose the published Boer coefficient set used for the estimate.
HeightUse centimeters when height unit is cm, or total inches when height unit is in.
Height unitChoose centimeters or inches.
WeightUse kilograms when weight unit is kg, or pounds when weight unit is lb.
Weight unitChoose kilograms or pounds.

Example

Using the default inputs, Lean Body Mass Calculator returns estimated lean body mass of 66.3 kg. Adjust age, sex used by equation, height, and height unit to match your own scenario.

FAQ

How is estimated lean body mass calculated here?

Lean body mass uses the Boer equation after normalizing weight to kilograms and height to centimeters. The first assumption to check is: This calculator is for adult educational estimates only and is not medical, medication-dosing, or nutrition advice.

What does Estimated lean body mass mean for lean body mass?

Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Secondary values such as estimated non-lean mass and estimate note are there to explain the primary answer, not to replace it.

What should I enter for Age?

Adult-only educational estimate; not for pediatric, pregnancy, or clinical dosing use. Use years for this field. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.

How does Sex used by equation change estimated lean body mass?

Choose the published Boer coefficient set used for the estimate. Changing it can alter estimated lean body mass because the formula uses the submitted inputs together. Also compare measurement method, formula population, age range, units, sex or activity assumptions, and clinical context.

Why does the lean body mass example show 66.3 kg for estimated lean body mass?

The default inputs produce 66.3 kg for estimated lean body mass. Treat that as a format and scale check, then replace every default value with your own inputs.

Can the lean body mass result diagnose or prescribe anything?

No. Use it as educational context only. Health formulas can depend on population, measurement method, age range, and clinical context.

Sources

Last reviewed: 2026-05-26

  • Reviewed 2026-05-26 · Source 1984
    Estimated lean body mass as an index for normalization of body fluid volumes in humansAmerican Journal of Physiology / PubMed. Choice of Boer equation and kg/cm input basis.
    Scope
    Original Boer lean body mass source using height and weight.
    Supports
    Choice of Boer equation and kg/cm input basis.
  • Reviewed 2026-05-26 · Source 2018
    Lean Body Weight-Tailored Iodinated Contrast Injection in Obese Patient: Boer versus James FormulaKorean Journal of Radiology / PubMed Central. Risk framing that lean body weight equations are clinical estimates and should not be treated as universal body-composition truth.
    Scope
    Clinical study referencing Boer and James lean body weight equations and formula selection implications.
    Supports
    Risk framing that lean body weight equations are clinical estimates and should not be treated as universal body-composition truth.
  • Reviewed 2026-05-26 · Source 2005
    Quantification of lean bodyweightClinical Pharmacokinetics / PubMed. Visible limitation and formula-scope guardrail for extreme inputs and dosing-adjacent misuse.
    Scope
    Review of lean body weight quantification and inconsistency at extremes of size.
    Supports
    Visible limitation and formula-scope guardrail for extreme inputs and dosing-adjacent misuse.

Disclaimer

This health calculator is for educational body-metric estimates only. It does not diagnose, prescribe diet or treatment, or replace individualized advice from a qualified health professional.