# FFMI calculator

FFMI (Fat-Free Mass Index) calculator is used to calculate the lean body mass index of an individual. It is similar to BMI, but it is more accurate in assessing the body composition of an individual as it takes into account the amount of muscle mass.

The FFMI can be calculated using the following formula:

FFMI = (Lean Body Mass in kg / Height in meters squared) + 6.1 x (1.8 – Height in meters)

Where Lean Body Mass = Body Weight in kg x (1 – Body Fat Percentage)

To use the FFMI calculator, you will need to know your body weight, height, and body fat percentage. Here are the steps to calculate the FFMI:

1. Determine your body fat percentage using a body fat caliper or other method.
2. Calculate your Lean Body Mass using the formula: Lean Body Mass = Body Weight in kg x (1 – Body Fat Percentage)
3. Convert your height to meters by dividing your height in centimeters by 100.
4. Calculate your FFMI using the formula: FFMI = (Lean Body Mass in kg / Height in meters squared) + 6.1 x (1.8 – Height in meters)

The FFMI calculator will perform these steps automatically when you enter your height, weight, and body fat percentage. It will give you your FFMI score, which can be used to assess your muscle mass and body composition.

## What is FFMI

FFMI stands for fat free body mass index with which you can calculate the amount of muscle mass relative to height. This index used by bodybuilders to compare themselves to others.
Also FFMI is a an alternative to body mass index.

## FFMI formula

Total Body Fat = Weight * (body fat [%] / 100)
Lean Weight = Weight * (1 – (body fat [%] / 100)
FFMI = (Lean Weight / 2.2) / ((Feet * 12.0 + Inches) * 0.0254)2
Adjusted FFMI = FFMI + ( 6.3 * (1.8 – (Feet * 12.0 + Inches) * 0.0254))

## FFMI interpretation

The calculated normalized ffmi can be interpreted using the tables below. You also need to consider that the interpretation for men and women will be different, so there are 2 tables.

### FFMI score for men

FFMI Body fat Description
17-18 10-18% Skinny man
18-20 20-27% Average man
19-21 25-40% Fat man
20-21 10-18% Athlete / Intermediate gym user