FFMI Calculator
Use the FFMI Calculator for a transparent, instant calculation with validated inputs and cited sources. For a query such as “ffmi calculator”, enter the matching values and units below and review the stated assumptions.
How to use this calculator
Enter the requested values and units.
Review the assumptions and any warnings shown with the result.
Use the result together with the cited source and your real-world requirements.
Formula
FFMI = fat-free mass in kilograms ÷ height in meters².
Worked example
Worked example: Inputs: Body weight: 80 kg; Body fat percentage: 15 %; Height: 1.8 m. Outputs: Fat-free mass index: 20.987654; Kouri height-normalized FFMI: 20.987654.
Assumptions and limits
- The result depends on the values, units, and assumptions entered. It does not infer missing context.
- Review the assumptions and any warnings shown with the result.
Sources
- Clinical Journal of Sport Medicine: Fat-free mass index in users and nonusers of anabolic-androgenic steroidsReference material reviewed for the stated method, units, or domain. Confirm that its scope matches your use case. Reviewed 2026-08-14.
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Frequently asked questions
How does the FFMI Calculator work?
FFMI = fat-free mass in kilograms ÷ height in meters².
What should I enter?
Body weight, Body fat percentage, Height
What should I verify?
Review the assumptions and any warnings shown with the result. The result depends on the values, units, and assumptions entered. It does not infer missing context.
Last updated 2026-08-14 · health-ffmi-v1 · opportunity-content-2026-08-14 · Trusty Calculator Editorial Team