FFMI Calculator (Fat-Free Mass Index)

Calculate your Fat-Free Mass Index (FFMI) to determine your lean muscle mass relative to height.

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Understanding Your FFMI Results

What is FFMI?

Fat-Free Mass Index (FFMI) is a measurement that estimates lean muscle mass relative to height, providing a more accurate assessment of body composition than BMI for athletes and bodybuilders.

Normal FFMI Ranges

  • Men: 17-20 kg/m² (13-22% body fat)
  • Women: 15-17 kg/m² (25-33% body fat)

Interpreting Results

  • Below 18: Below average muscle mass
  • 18-20: Average muscle mass
  • 20-22: Above average muscle mass
  • 22-25: Exceptional muscle mass
  • Above 25: Extremely high muscle mass