📊Calculate Your FFMI
📈Your FFMI Results
🕐Calculation History
ℹ️About FFMI Calculator
The Fat-Free Mass Index (FFMI) is a metric used to assess muscle mass relative to height, similar to BMI but adjusted for body fat percentage. It provides a more accurate picture of your body composition than BMI alone.
FFMI is particularly useful for athletes and fitness enthusiasts to track muscle development and body composition changes over time. Unlike BMI, FFMI accounts for body fat, giving you a clearer picture of your lean muscle mass.
Our calculator uses the standard FFMI formula: FFMI = (Lean Body Mass in kg) / (Height in meters)2, with an adjustment for height over 1.8m (5'11").
FFMI Categories
- Below Average: FFMI < 18 (men) / < 15 (women)
- Average: FFMI 18-20 (men) / 15-17 (women)
- Above Average: FFMI 20-22 (men) / 17-19 (women)
- Excellent: FFMI 22-24 (men) / 19-21 (women)
- Superior: FFMI > 24 (men) / > 21 (women)
❓Frequently Asked Questions
What is FFMI and why is it important?
FFMI (Fat-Free Mass Index) measures your muscle mass relative to your height. It's important because it provides a more accurate assessment of body composition than BMI, especially for athletic individuals with higher muscle mass.
How is FFMI different from BMI?
BMI calculates body mass relative to height without distinguishing between muscle and fat. FFMI specifically measures lean muscle mass by factoring in body fat percentage, making it more accurate for fitness assessment.
How accurate is this FFMI calculator?
Our calculator uses the standard FFMI formula validated in sports science research. Accuracy depends on precise input of weight, height, and body fat percentage. For best results, use professionally measured body fat percentages.
What's a good FFMI score?
For men, FFMI between 18-20 is average, 20-22 is above average, 22-24 is excellent, and above 24 is superior. For women, subtract approximately 3 from these values. Elite athletes often have FFMI scores in the superior range.
Can FFMI be too high?
Naturally achievable FFMI typically maxes around 25 for men and 22 for women without performance-enhancing substances. Extremely high FFMI values may indicate unusual muscle development or measurement error.