CALCULATE

CALCULATE

The FFMI uses three inputs to provide a score of muscle mass. It is necessary to follow the next steps:

- Enter the Body weight, measured in kilograms. The value must be positive in the range [20, 220];
- Enter the Body height, measured in meters. The value must be positive in the range [0.3, 2.3];
- Enter the Body fat, measured in percent units. This value must be positive in the range (1, 98);
- Press the ”Calculate” button to make the computation;

The body fat can be calculated by the following formula

body fat = weight ×
body fat percentage
100

Fat free mass is

fat free mass = weight × ( 1 −
body fat percentage
100
)

FFMI can be calculated by the following formula

FFMI =
fat free mass
height^{2}

Normalized FFMI (for men) is

normalized FFMI = FFMI + 6.1 × (1.8 − height)

Normalized FFMI (for women) is

normalized FFMI = FFMI + 6.1 × (1.63 − height)

Firstly, we should know our body fat parameter in percentage. If we don’t know it, we can use the body fat calculator to get this parameter.

__Fat-Free Mass Index__, or shortly FFMI, finds the amount of muscle mass in relation to weight, height, and body fat. FFMI is part of the body indexes, and it is an excellent measure of mus- cularity. Although the FFMI is less used, it is more precise than BMI (Body Mass Index) which also provides information about a person’s condition and health. FFMI allows distinguishing between fat gain and muscle gain. If the mass of fat increases, then the FFMI index decrease, and if the mass of muscle increases, the FFMI index increases. For people, with more muscle mass than average, the FFMI calculator would be a very useful tool.

On the other hand, the Normalized FFMI is intended for persons who are taller in height. The normalized FFMI formula adjusts the FFMI reading from the above a 1.8 meter for men and 1.63 meters for women. Normalized FFMI corrects FFMI by using linear regression. It is identical to the non-normalized FFMI value for a person who is taller than the mean value of the population.

On the other hand, the Normalized FFMI is intended for persons who are taller in height. The normalized FFMI formula adjusts the FFMI reading from the above a 1.8 meter for men and 1.63 meters for women. Normalized FFMI corrects FFMI by using linear regression. It is identical to the non-normalized FFMI value for a person who is taller than the mean value of the population.

FFMI is equivalent to free fat body mass in kilos divided by height in meters squared. The corresponding equation is

To perform a proper calculation, we need to know body fat result in percentages. The body fat value estimates what percentage of our total body weight is body fat. The FFMI calculator uses mathematical formulas for computing the fat-free mass, FFMI as well as Normalized FFMI.

For example, let us calculate FFMI for a man who has 1.9 meters, weighs 90 kilograms, and has 24% of body fat. Firstly, we calculate body fat

Fat-Free Mass Index calculator allows us to change the units which are displayed. We can switch between centimeters, meters, kilograms, pounds, etc., according to needs and preferences.

FFMI =
fat free mass
height^{2}

It is expressed in kilograms per square meter. The average score for men is 19, and average score for women is about 15.
To perform a proper calculation, we need to know body fat result in percentages. The body fat value estimates what percentage of our total body weight is body fat. The FFMI calculator uses mathematical formulas for computing the fat-free mass, FFMI as well as Normalized FFMI.

For example, let us calculate FFMI for a man who has 1.9 meters, weighs 90 kilograms, and has 24% of body fat. Firstly, we calculate body fat

body fat = 90 ×
24
100
= 21.6 kg

The next step is to estimate fat free mass by using its formula, so
fat free mass = 90 × ( 1 −
24
100
) = 68.4 kg

Now, the FFMI and normalized FFMI (because the men is taller than the mean value, 1.8m) are given, respectively
FFMI =
68.4
1.9^{2}
= 18.84
kg
m^{2}

normalized FFMI = 18.84 + 6.1 × (1.8 − 1.9) = 18.23
kg
m^{2}

The normalized FFMI is 18.23 kg/m2, it classifies our man to the average result, the message with the classification range is displayed automatically below the calculator.
Fat-Free Mass Index calculator allows us to change the units which are displayed. We can switch between centimeters, meters, kilograms, pounds, etc., according to needs and preferences.

The following table indicates the classification of normalized FFMI indexes for men and women. It is very clear that the body composition of men and women is different. Men possess less body fat, more muscle mass, and greater bone density compared to women. Women, on the other hand, have more body fat to maintain their menstrual cycle and support childbirth.

**Men**

**Women**

We can conclude that a normal average FFMI value for men is around 19 (and 16 for women), while a value above 25 (and 21 for women) indicates steroid usage.

We can conclude that a normal average FFMI value for men is around 19 (and 16 for women), while a value above 25 (and 21 for women) indicates steroid usage.