1. What is RFM (Relative Fat Mass)?

Definition: RFM is a simple method to estimate body fat percentage using just height and waist circumference measurements.

Purpose: It provides an alternative to BMI that may better account for body composition and fat distribution.

2. How Does the RFM Calculator Work?

The calculator uses the formula:

Where:

• \( RFM \) — Relative fat mass percentage
• \( H \) — Height in centimeters
• \( W \) — Waist circumference in centimeters

Explanation: The ratio of height to waist circumference is used to estimate body fat percentage, with the constants derived from statistical analysis.

3. Importance of RFM Calculation

Details: RFM provides a quick estimate of body fat that correlates well with more complex methods like DEXA scans, and may be more accurate than BMI for some individuals.

4. Using the Calculator

Tips: Measure your height and waist circumference accurately. Waist should be measured at the narrowest point between ribs and hips.

5. Frequently Asked Questions (FAQ)

Q1: How does RFM compare to BMI?
A: RFM considers waist size rather than weight, potentially better reflecting body composition and fat distribution.

Q2: What's a healthy RFM range?
A: Generally, 10-20% for men and 20-30% for women is considered healthy, but consult a healthcare professional.

Q3: When is RFM most useful?
A: For individuals where BMI might be misleading (muscular athletes, elderly with muscle loss, etc.).

Q4: How accurate is RFM?
A: Studies show it's comparable to more complex methods for most people, but not perfect.

Q5: Should I use RFM for children?
A: No, this formula is validated for adults only. Different methods are needed for children.