Calculate Fat-Free Mass Index (FFMI) to compare muscle mass across different body sizes. Enter weight, height, and body fat to view FFMI, normalized FFMI, lean mass, BMI, and classification guidance.
Select measurement system, body fat percentage, and sex to tailor results.
Use scale weight. Convert from pounds if using metric inputs.
Height directly influences normalized FFMI.
Use DEXA, caliper, or bioimpedance measurements for accuracy.
Used for interpretation guidance—FFMI formula applies to all.
Select measurement units, enter weight, height, and body fat, then press “Calculate FFMI.” The tool returns FFMI, normalized FFMI, lean mass, and BMI.