RFM Calculator

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.


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 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

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

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 (%).