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Fact Checked
Fact Checked
This article was written by one of our team of experienced writers, and fact-checked by our experts or our editors. The numbers in parentheses (e.g., 1, 2, 3, etc.) throughout the article are reference links to peer-reviewed studies.
Our team of experts includes a board-certified physician, nutritionists, dietitians, certified personal trainers, strength training experts, and exercise specialists.
Read Our Editorial Process

Relative Fat Mass (RFM) Calculator

The relative fat mass (RFM) calculator is a simple online tool that provides a more accurate estimate of body fat mass compared to body mass index (BMI).

Written by Matthew Magnante, ACE

Last Updated on9 June, 2022 | 12:59 AM EDT

Ask Question?

What’s your body fat category – athlete, fitness, average, or obese? Find your body fat percentage estimate with the relative fat mass tool. 

Height in Feet
Height in Inches
Waist in Inches

Calculating result please wait..

If you would like to use this calculator on your website or blog you can simply embedded this calculator in one click. Use the below'Generate Code'tool to get the embedded code.

Copy the below code and paste it in your web page in HTML format anywhere between<body>start and</body>end tag.

The relative fat mass (RFM) calculator estimates body fat percentage based on a formula that measures the ratio of your height and waist circumference. Research has shown that RFM equations are more accurate than the body mass index (BMI) for predicting body fat mass and health status (1). 

Learn more about this helpful online health tool below. 

How The RFM Calculator Estimates Body Fat Percentage

The RFM body fat measurement method was developed by researchers at the Cedars-Sinai Diabetes and Obesity Research Institute. It was designed to provide a more accurate approximation of body fat mass compared to the basic Body Mass Index (BMI) formula. 

RFM formulas for men and women

RFM calculator uses a separate formula for men and women due to the biological differences between genders that plays a important role in proper classification of body fat status. 

We ve included the formulas for both men and women below. 

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  • RFM for adult males = 64 – 20 x (Height / Waist circumference)
  • RFM for adult females = 76 – 20 x (Height / Waist circumference)

If you want to check the accuracy of the RFM calculator, you can use the above formulas to manually calculate your body fat percentage. 

So, for example, if you’re a five foot, ten-inch tall male with a 33-inch waist, you would input the details and perform the calculations as follows. 

  • 64 – 20 x (Height / Waist circumference)
  • 64 – 20 x (70 inches/33 inches)
  • 21.57 rounded
  • 22% body fat

The individual used in the example has 22% body fat. 

According to the American Council on Exercise, the relative fat mass result can also be interpreted as follows:

Classification Males (% fat) Females (% fat)
Essential fat 2-5% 10-13%
Athletes 6-13% 14-20%
Fitness 14-17% 21-24%
Average 18-24% 25-31%
Obese 25% and higher 32% and higher

Note: Woolcott and Bergman (2020) propose RFM cut-offs of 40% for females and 30% for males to diagnose obesity and higher mortality risk.

Taking your height measurement

Most people have an idea of their height although it’s common to under or overestimate. You want to take your height measurement with shoes off, feet together, and standing close to a wall. There are may resources on the internet that can help you to get the most accurate reading. 

How to measure your waist circumference

To get the most accurate body fat percentage estimation, it’s very important that you understand how to take a correct waist measurement. We’ve provided instructions to ensure you get a proper reading of your waist circumference. 

Note: We recommend having someone take your measurement if possible. Although, it’s certainly not required. 

  1. Grab a cloth tape measurer or similar and make sure it’s not wrinkled before taking the measurement. 
  2. Stand up straight and wrap the tape around the part of your stomach above the hip bones and below the ribs. Make sure the tape is flat against your skin and even from front to back. 
  3. Breathe out normally and record the measurement.

Related Calculators:

  • BMI Calculator
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  • Body Fat Skinfold Calculator
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  • 3 Skinfold Body Fat Calculator
  • Body Fat US Navy Calculator
  • TDEE Calculator

Why Should You Know Your Body Fat Percentage?

Your specific reason for calculating your body fat percentage may be different from the next person; however, the end result applies to everyone, whether you have too much body fat or too little. The RFM calculator is a tool which helps you to make adjustments to your body composition effectively.


If you have any questions about this article, please feel free to contact Matthew Magnante by leaving a comment below.

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Matthew Magnante, ACE

Matthew Magnante, ACE

Matthew is an ACE (American Council On Exercise) certified fitness professional who has had a passion for fitness since elementary school and continues to research and learn how to build muscle effectively through training and diet. He also loves to help others to achieve their fitness goals and spread the knowledge where needed. Matthew's other passions include learning about mindfulness, strolling through nature, traveling, and always working to improve overall.

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