Free Lean Body Mass Calculator
Calculate lean and fat mass from body weight and a body-fat percentage you provide.
Lean Body Mass Calculator
Enter a value to begin.
How to use this lean body mass calculator
- Enter body weight in kilograms and a measured or separately estimated body-fat percentage.
- Check the inputs and preview, then use the primary action.
- Download, copy or use the result shown by the tool.
How the result is calculated
Lean body mass is total weight multiplied by one minus body-fat percentage. This arithmetic does not measure body composition; its accuracy cannot exceed the body-fat input and it must not be used for medication dosing.
All calculation and transformation work happens in this browser tab. No entered value is sent to an Noler Tools application server.
Important limitations
Results are provided for convenience and should be checked independently before an important decision. A format or checksum result never authenticates an identity, document, account, licence, vehicle or registration.
Health limitation: This is a general educational estimate, not medical advice, diagnosis or a substitute for care from a qualified clinician. Do not use it to make treatment, nutrition, pregnancy or emergency-care decisions.
Frequently asked questions
Is this lean body mass calculator free?
Yes. It is free to use and does not require an account.
Does Noler Tools save my input?
No. The input and result remain in temporary browser memory and are not uploaded or saved by this site.