RFM Calculator

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If you want to know the fat your body contains by measuring height and waist, this RFM calculator is made for you.

What are the body fats?

In biological terms, body fats are known as adipose tissue. It is the imperative element of the human body mainly used to store the energy taken from food. Moreover, It also plays a vital role in producing adrenaline (like leptin) and preserving intestinal organs. However, The body fat percentage may vary according to age, diet and gender.

What is RFM?

RFM stands for Relative Fat Mass. It is the simplest and fastest way to the body's fat percentage using height and waist only.


Formula Of RFM Calculator

To calculate the body fat mass using RFM, you can apply it to the formula listed below; It may vary for both males and females.

For male:

RFM = 76 - (20 *(height / waist))

For female:

RFM = 76 - (20 *(height / waist))
Interpretation Fat level men (%) Fat level women (%)
Extremely low level of fat 2 10
Essential fat 2-5 10-13
Athletes 6-13 14-20
Fitness 14-17 21-24
Average 18-24 25-31
Obese 25+ 32+


To know about BEE, you can use our BEE Calculator.


To clear the concept of RFM, let us perform a practical example.

Suppose a boy having a height of 5.7 ft and a waist of 34 inches then calculate the fat percentage his body contains using the RFM method.

Given data

Height = 5.7 ft = 173.736 cm
Waist = 34 in = 86.36 cm

To Find

Body fat (%) using RFM = ?


For male : RFM = 64 - (20 * height / WC)

Putting values in the above equation

RFM = 64 - (20 * 173.736 / 86.36) = 24%
A Relative Fat Mass his body contains is 24%.

How to use RFM Calculator?

The steps to use RFM calculator are as follows:

Step 1: Select the type from the required dropdown.

Step 2: Enter the value of height in the required input.

Step 3: Enter the value of waist in the required input.

Step 4: The calculator will automatically display an answer on the screen.

Calculator Use

To get your body fat percentage using RFM Calculator, you must have to put your body's height and waist. After that, the result will appear on the screen in a few moments in (%).