This Fat-Free Mass Index (FFMI) Calculator allows you to calculate your fat-free mass index, based on your body fat, weight and height. It also shows your FFMI category.

To estimate your FFMI, complete the following simple steps:

- 1. Choose the measurement system (imperial or metric)
- 2. Input your height in either feet and inches or centimeters
- 3. Enter your weight in lbs or kgs
- 4. Input your body fat percentage
- 5. Click the "Calculate" button to generate the results.

## FFMI Formulas

The mathematical formulas to compute the fat-free mass index (FFMI) are listed below:

**Fat-Free Mass Index (FFMI):** FFMI [kg/m^{2}] = FFM [kg] / (height
[m])^{2}

**Normalized Fat-Free Mass Index:** Normalized FFMI [kg/m^{2}] = FFM [kg]
/ (height [m])^{2} + 6.1 × (1.8 − height [m])

**Fat-Free Mass (FFM):** FFM [kg] = weight [kg] × (1 − (body fat [%]
/ 100))

Reference:* Kouri E. M., Pope H. G. Jr, Katz D.
L., Oliva P. Fat-free mass index in users and nonusers of anabolic-androgenic
steroids. Clin J Sport Med 1995 Oct; 5(4):223-8.*

You may also be interested in our Body Shape Calculator

**Fat-Free Mass Index (FFMI):**

**Adjusted (Normalized) FFMI:**

**Fat-Free Mass (FFM):**

**FFMI Category:**

This Fat-Free Mass Index (FFMI) Calculator allows you to calculate your fat-free mass index, based on your body fat, weight and height. It also shows your FFMI category.

To estimate your FFMI, complete the following simple steps:

- 1. Choose the measurement system (imperial or metric)
- 2. Input your height in either feet and inches or centimeters
- 3. Enter your weight in lbs or kgs
- 4. Input your body fat percentage
- 5. Click the "Calculate" button to generate the results.

## FFMI Formulas

The mathematical formulas to compute the fat-free mass index (FFMI) are listed below:

**Fat-Free Mass Index (FFMI):** FFMI [kg/m^{2}] = FFM [kg] / (height
[m])^{2}

**Normalized Fat-Free Mass Index:** Normalized FFMI [kg/m^{2}] = FFM [kg]
/ (height [m])^{2} + 6.1 × (1.8 − height [m])

**Fat-Free Mass (FFM):** FFM [kg] = weight [kg] × (1 − (body fat [%]
/ 100))

Reference:* Kouri E. M., Pope H. G. Jr, Katz D.
L., Oliva P. Fat-free mass index in users and nonusers of anabolic-androgenic
steroids. Clin J Sport Med 1995 Oct; 5(4):223-8.*

You may also be interested in our Body Shape Calculator