male, 82 kg, 180 cm
- Estimated fat mass
- 19.77 kg
- Lean percent
- 75.9%
- Formula
- Boer
Lean body mass includes muscle, bone, organs, and water. It is not muscle mass only, and it is not a body-composition scan.
Lean Body Mass Calculator
Use this free lean body mass calculator to estimate fat-free mass from height, weight, and formula sex using the Boer equation, with implied fat mass and lean percent for context.
Estimate, not diagnosis Formula notes Example inputs Tab-only history
Formula steps
- Use height, weight, and formula sex in the Boer lean body mass equation.
- Subtract estimated lean mass from body weight for an approximate fat-mass comparison.
- Divide lean mass by body weight for lean percent.
- Keep protein, TDEE, clinical dosing, and scan results separate from this formula estimate.
How to use the Lean Body Mass Calculator
- Enter the requested measurements, dates, lab values, or workout details.
- Check that the units and formula assumptions match what the tool is asking for.
- Press the calculate button to see the answer, supporting metrics, and formula steps.
- Read the estimate with the health disclaimer in mind, then copy the result if you need it for notes.
What people use it for
Estimate lean body mass for fitness context.
Compare lean mass, implied fat mass, and lean percent from the same inputs.
Use a formula estimate when body fat percentage is unknown.
Keep protein, TDEE, and clinical decisions separate from the simple formula output.
Quick examples
Male 180/82
180 cm, 82 kg62.23 kg LBM, 75.9% lean
Female 165/62
165 cm, 62 kg45.37 kg LBM, 73.18% lean
Female 172/70
172 cm, 70 kg50.70 kg LBM, 72.42% lean
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Lean Body Mass Calculator See slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Health & Fitness Browse related calculators and utilities in the same category.
- Calculator and utility guides Find more guides that use real tool inputs and example numbers.
- All free tools Search every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the estimate, what the formula means, what it cannot decide for you, and how privacy works.
When should I use the Lean Body Mass Calculator?
Use it for simple educational checks, trend tracking, or planning tasks like these: Estimate lean body mass for fitness context. Compare lean mass, implied fat mass, and lean percent from the same inputs. It can help you understand a number, but it cannot explain your whole health situation.
What do the main Lean Body Mass Calculator inputs mean?
Enter formula sex, height in centimeters, and weight in kilograms. The formula sex setting chooses the Boer equation constants. The calculator does not ask for body fat percentage, age, training status, or scan results.
What is the Lean Body Mass Calculator doing with my inputs?
In plain language: The calculator uses Boer lean body mass equations. Male LBM = 0.407 x weight kg + 0.267 x height cm - 19.2. Female LBM = 0.252 x weight kg + 0.473 x height cm - 48.3. Read the result together with the notes on the page, because health and fitness numbers often need personal context.
How should I read the Lean Body Mass Calculator result?
Read lean body mass as a Boer formula estimate of fat-free mass. It includes muscle, bone, organs, and water, so it is not muscle mass only. The estimated fat mass and lean percent are rough comparisons, not a scan or diagnosis.
Does this calculator use body fat percentage?
No. This page estimates lean body mass from height, weight, and formula sex. If you already know body fat percentage, lean body mass can also be estimated as body weight times one minus body fat percentage.
Is lean body mass the same as muscle mass?
No. Lean body mass includes muscle, bone, organs, water, and other fat-free tissue. It is broader than muscle mass, so do not read this as a muscle-only score.
Can I use this for protein or TDEE planning?
You can use the number as rough context, but it is not a protein prescription, fat-loss plan, bodybuilding target, or TDEE rule. Use dedicated nutrition tools and professional guidance when the decision matters.
Is this the same as clinical lean body weight?
No. Clinical calculators may use specific dosing rules, pediatric formulas, adjusted body weight, or institution guidance. This page is an educational Boer formula estimate only.
Can I use this as medical advice?
This is a formula estimate, not a DEXA scan, body-fat test, muscle-mass scan, protein prescription, TDEE prescription, clinical lean body weight order, pediatric formula, or medication-dosing rule. Use the calculator as a learning tool, then ask a qualified professional about decisions that affect care, pregnancy, medication, nutrition, or safety.
What should I double-check before trusting the result?
Check the units, date, and personal details before reading the answer. For example, pounds and kilograms, inches and centimeters, or a wrong activity level can change the result quickly. If the number feels surprising, rerun it slowly and compare it with the examples.
Does the site save my health inputs?
No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.
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