Calculate your Fat-Free Mass Index (FFMI) to scientifically track your lean muscle growth and understand your natural genetic potential.
While standard BMI simply looks at your total weight, FFMI isolates your lean muscle mass relative to your height. It is a highly respected metric in the bodybuilding community used to accurately track true muscular development over time while ignoring temporary body fat gains.
Enter your total weight, height, and your estimated body fat percentage. The calculator subtracts your fat mass to determine your total lean mass, delivering your baseline and normalized FFMI score alongside a chart indicating your genetic muscle tier.
Yes, 100% Free! Monitor your long-term athletic progress and evaluate muscle density changes accurately without paying premium software fees.