How to use the Lean Body Mass Calculator

Quick start

1. Open the Lean Body Mass Calculator.
2. Enter height, weight, and formula sex.
3. Use the first example, "Male 180/82: 180 cm, 82 kg", if you want to see a filled-out calculation before entering your own values.
4. Calculate, read the formula line, then copy the result only after the units and assumptions look right.

Best uses

Use this guide when one of these tasks matches what you are trying to do.

• Estimate lean body mass for fitness planning.
• Compare lean mass with body weight.
• Use a formula estimate when body fat percentage is unknown.
• Track changes only as rough estimates.

What this calculator is for

The Lean Body Mass Calculator estimates fat-free mass with the Boer equation. It is a simple formula reference, not a scan of your body composition.

Use it when you want to: Estimate lean body mass for fitness planning. Compare lean mass with body weight.

What to enter

Good answers start with clean inputs. Before calculating, check the labels, units, and dates so the tool is solving the same problem you actually have.

• Enter height, weight, and formula sex.
• Use current values if you want a current estimate.
• Use the same formula when tracking changes.

Example walkthrough

Try the calculator example: Male 180/82: 180 cm, 82 kg. The example result is Lean body mass estimate.

• For 180 cm and 82 kg, the calculator applies the height and weight terms in the Boer equation.
• The result estimates lean body mass, and the remaining weight is a rough implied fat mass.

Formula and steps

The calculator uses Boer lean body mass equations based on height, weight, and formula sex.

The formula line on the calculator page is there so the answer is not a mystery. Read it when you need to understand where the number came from.

How to read the answer

Use the result as an educational estimate. For health, pregnancy, nutrition, kidney, alcohol, or training decisions with real consequences, get qualified professional guidance.

• Lean body mass includes muscle, bone, organs, and water.
• The estimate can be useful beside body fat percentage, but it is still formula-based.

Common mistakes to avoid

Most bad calculator results come from a small input mistake or from using a good estimate for the wrong decision.

• Do not read lean mass as muscle mass only.
• Do not compare formula estimates with DEXA or other methods as if they are identical.
• Do not use it for medication or clinical decisions.

What to try next

A related calculator can help check the same topic from another angle instead of relying on one number.

• Use Body Fat Calculator for a tape-based estimate.
• Use BMR Calculator to see how body size affects resting energy estimates.

Sources and safety notes

This guide uses public-health, clinical, or peer-reviewed references where the calculator needs a specific formula or interpretation boundary.

Source links are provided for transparency, but they do not turn the calculator into medical advice or a replacement for professional care.

• CDC: Adult BMI categories and screening notes
• NHLBI: Healthy weight and BMI tools

Examples from the calculator

Common questions

Related tools

• Body Fat Calculator Estimate body fat percentage with a tape-measure method.
• BMR Calculator Estimate basal metabolic rate with the Mifflin-St Jeor equation.
• Ideal Weight Calculator Estimate ideal body weight and compare it with healthy BMI range.

History, privacy, and copying

Recent answers stay visible in the page while you work. The history is kept only in the current browser tab and is not sent to a server.

Copy answer copies the expression and result so you can paste it into notes, homework, a message, or another document.