Adjusted FFMI Calculator

How to calculate Adjusted FFMI?

FFMI measures muscle mass relative to height, while the adjusted version accounts for the fact that taller individuals naturally carry more mass.

Formula: Adj. FFMI = FFMI + 6.1 × (1.8 - Height_m)

Using the FFMI calculator: an example

Example for a 90kg athlete at 10% body fat and 1.9m height:

Step-by-step calculation:

• Calculate Lean Mass: 90kg × 0.9 = 81kg
• Calculate Base FFMI: 81 / (1.9²) = 22.44
• Apply Height Correction: 22.44 + 6.1 × (1.8 - 1.9) = 21.83

Frequently Asked Questions

What is a natural limit?
Most natural athletes peak between 23-25; scores above 25 are typically associated with elite genetics or enhancement.

Why adjust for height?
Height normalization corrects the mathematical bias that gives taller lifters an artificially high raw FFMI.

Is FFMI better than BMI?
Yes, because it distinguishes between muscle and fat mass, making it superior for athletes.