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Quickly calculate your Fat‑Free Mass Index (FFMI) — enter weight, body fat %, and height to see how muscular you are relative to height. Short instructions: Enter your weight in kilograms. Enter your body fat percentage. Enter your height in centimeters. Click Calculate to get your FFMI and a short interpretation. Formula (short): FFMI = (Weight × (1 − BodyFat%/100)) / (Height in meters)²