Benchmarks
Good FFMI
Compare practical FFMI ranges for men and women, from average to advanced and elite.
Read benchmarks →Body composition calculator
FFMI Calculator
Estimate your fat-free mass index, lean body mass, and next-level target using height, weight, and body fat.
Use body fat and lean mass tools if you want more context before calculating FFMI.
Fat-Free Mass Index Calculator
Your FFMI Score
Estimate lean mass, normalized FFMI, and your next level target.
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Featured Guides
Start With the Most Useful GetFFMI Guides
A short path through the calculators and body composition guides most people need first.
Chart
FFMI Chart
Use men’s and women’s FFMI ranges as a quick reference for interpreting your score.
View chart →Natural Limits
Natural FFMI Limit
Understand FFMI 25, natural muscle potential, and how to interpret unusually high scores.
Read article →Accuracy
Is FFMI Accurate?
Learn when FFMI is useful, where it can mislead, and why body fat estimate quality matters.
Read accuracy guide →Body Composition
Body Fat Percentage Chart
Compare common body fat percentage ranges for men and women before interpreting your estimate.
View chart →Muscle Growth
How to Increase FFMI
Learn how training, nutrition, recovery, and consistency help increase lean mass over time.
Read guide →Frequently Asked Questions
What is a good FFMI for beginners?
Most beginners fall somewhere around average ranges. With consistent training, nutrition, and recovery, FFMI can increase over time as lean muscle mass improves.
Is FFMI better than BMI?
For muscular people, FFMI is usually more informative because BMI does not separate fat mass from muscle mass.
Can I increase my FFMI naturally?
Yes. Focus on progressive overload, enough protein, a smart calorie target, adequate sleep, and long-term consistency.
How accurate is FFMI?
FFMI is only as accurate as the inputs. Body fat percentage estimates can vary, so treat the result as a helpful estimate rather than a medical measurement.