RFM Calculator
Calculate your Relative Fat Mass - more accurate than BMI
Calculate Your Relative Fat Mass
RFM formulas differ for men and women
Height in centimeters
Measure at the narrowest point, usually just above the hip bones
RFM Results
Health Assessment Notice
Example Calculations
Male Example
Height: 180 cm (5 feet 11 inches)
Waist: 85 cm (33.5 inches)
RFM Calculation: 64 - (20 × 180/85) = 64 - 42.4 = 21.6%
Category: Average (18-24%)
Assessment: Healthy body fat level for men
Female Example
Height: 165 cm (5 feet 5 inches)
Waist: 70 cm (27.6 inches)
RFM Calculation: 76 - (20 × 165/70) = 76 - 47.1 = 28.9%
Category: Average (25-31%)
Assessment: Healthy body fat level for women
RFM vs BMI Advantage
RFM Benefits: No weight measurement needed
Accuracy: Better correlation with DEXA scan results
Application: Less affected by muscle mass
Simplicity: Only two measurements required
RFM Ranges
Men
Women
RFM vs BMI
No weight measurement needed
More accurate body fat estimation
Better for athletic populations
Accounts for fat distribution
Developed in 2018 research
Measurement Tips
Measure waist at narrowest point
Measure in the morning
Wear minimal clothing
Breathe normally during measurement
Understanding Relative Fat Mass (RFM)
What is RFM?
Relative Fat Mass (RFM) is a new metric developed in 2018 by researchers at Cedars-Sinai Medical Center. It estimates body fat percentage using only height and waist circumference, making it more practical and accurate than BMI for assessing obesity.
Scientific Foundation
RFM was developed using data from over 12,000 adults and validated against DEXA scans (the gold standard for body composition). It showed better correlation with actual body fat percentage compared to BMI.
Key Advantages
- •No weight measurement required
- •More accurate than BMI for body fat estimation
- •Accounts for central obesity (belly fat)
- •Less affected by muscle mass
RFM Formulas
For Men:
RFM = 64 - (20 × Height/Waist)
For Women:
RFM = 76 - (20 × Height/Waist)
Height and waist circumference in centimeters
Clinical Applications
- !Obesity screening and diagnosis
- !Cardiovascular risk assessment
- !Fitness and health monitoring
- !Alternative to BMI in research
Medical Disclaimer: RFM is a screening tool and should not replace professional medical assessment. Always consult healthcare providers for accurate diagnosis and treatment.