Lean Body Mass Calculator
Use the Lean Body Mass Calculator to split body weight into estimated fat mass and lean mass from a supplied body-fat percentage as a clear general estimate, not a diagnosis or medical advice.
Lean Body Mass Calculator
Tool inputs are not stored, and private values stay out of analytics.
Result
How it works
Enter the requested values, check the units, then run the Lean Body Mass Calculator for a copyable informational estimate.
The tool works by multiplying body weight by the entered body-fat fraction and subtracting it from total weight. The result is a general estimate that cannot account for every individual factor and does not replace a clinician. Inputs stay in the browser.
Examples
Practical example
At 80 kg and 20% body fat, estimated lean mass is 64 kg.
Method and source
Uses a transparent arithmetic estimate and displays its assumptions; it is not a diagnosis or individualized recommendation.
FAQ
How do I use the Lean Body Mass Calculator?
Enter accurate measurements, calculate, and read the safety note shown with the result.
Is this a medical diagnosis?
No. The result is informational only and does not diagnose a condition or replace a healthcare professional.
Are health inputs stored?
No. Processing stays in the browser and field values are not sent to analytics or the database.