Calcolatore FFMI

Enter the requested values and units to calculate the numeric result using the stated formula.

kg
cm
%
--
FFMI
kg/m²
--
Normalized FFMI
Kouri height-normalized
Fat-Free Mass
-- kg
Body fat measurement error is the largest source of uncertainty in any FFMI estimate. A 3-point error in body fat percentage typically shifts FFMI by 0.6 to 0.8 units — enough to move you between reference bands. Use the same measurement method consistently and focus on the trend over months.

Reference bands draw on Kouri EM, Pope HG, Katz DL & Oliva P, “Fat-free mass index in users and nonusers of anabolic-androgenic steroids” (Clin J Sport Med, 1995) and subsequent community usage. They are descriptive references, not diagnostic thresholds, and FFMI is not a test for steroid use.

Calculation only

The output is produced only from the values, units, and formula shown by this tool.

This tool does not compare the number with a clinical range, assign a category, diagnose a condition, or recommend an action. Check that your input units match the form and use your laboratory report or a qualified medical professional for interpretation.