Lean Body Mass Calculator

Estimate lean body mass from body weight and body fat percentage. Use this free browser-based lean body mass calculator from XTRAW Tools.

Lean Body Mass Calculator helps you estimate lean body mass from body weight and body fat percentage. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step.

How to Use the Lean Body Mass Calculator

Enter the required calculator inputs shown in the form.
Review the measurement, date, time, activity, body, nutrition, or training assumptions.
Run the calculator, then adjust one input at a time to compare scenarios.

What This Calculator Helps With

Estimate lean body mass from body weight and body fat percentage. It is designed for fitness users, body composition trackers, wellness users, and nutrition planners who want a fast, browser-based estimate before relying on a doctor, dietitian, trainer, coach, pregnancy care provider, public safety source, or other professional source.

Body Weight: 180 lb
Body Fat Percentage: 20%

Common Uses

People use this calculator when they need a quick way to estimate health, wellness, fitness, nutrition, timing, body composition, or training values from simple inputs.

Health Estimate: Create a quick wellness, fitness, nutrition, pregnancy, or body-measurement estimate from entered values.
Measurement: Use body, time, distance, nutrition, or training measurements to calculate a clear numeric result.

Formula or Method

Lean Body Mass = Body Weight × (1 - Body Fat Percentage / 100)

Example

Example inputs: Body Weight: 180 lb; Body Fat Percentage: 20%

Example result: Using the default inputs, estimated lean body mass is 144 lb.

Related Tools

Lean Body Mass Calculator FAQ

Is the Lean Body Mass Calculator free?

Yes. This calculator is free to use on XTRAW Tools.

Do I need to create an account?

No. XTRAW tools are designed for browser-based use without requiring an account.

Are the results exact?

Results may be estimates depending on the inputs, formula, and purpose of the calculator. Always verify important results before relying on them.

Disclaimer: This calculator is provided for general informational and convenience purposes only. It is not legal, financial, medical, tax, investment, insurance, accounting, pregnancy, health, fitness, nutrition, safety, or professional advice. Always verify important results with a qualified professional or authoritative source before making decisions.