Select your gender, enter your height, and enter your waist circumference into the calculator to determine your relative fat mass.

## RFM Formula

The following equations are used to calculate the relative fat mass.

RFMM = 64 – 20 * (H/W)

RFMF = 76 – 20 * (H/W)

- Where RFMM and RFMF are the relative fat mass for male and females respectively
- H is height (in)
- W is waist circumference (in)

## RFM Definition

RFM is short for relative fat mass and it is an estimate of a persons body fat weight using your height and waist circumference.

## RFM Example

How to calculate relative fat mass?

**First, determine your height.**Measure your height in inches.

**Next, determine your waist circumference.**Measure your waist circumference in inches.

**Finally, calculate the RFM.**Calculate the RFM using the formula above.

## FAQ

**What is RFM?**

RFM standard for relative fat mass. Relative fat mass if a measure of your body fat percentage using your height and waist circumference. It’s less accurate than other measures of body fat, but a better indication of fitness than BMI.

**What is a good body fat %?**

The healthy range of body fat % for males is 8-12% and 11-15% for females.