1. What is Relative Fat Mass (RFM)?

Definition: RFM is a simple method for estimating body fat percentage based on height and waist circumference measurements.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( RFM \) — Relative Fat Mass (%)
• \( H \) — Height (cm)
• \( W \) — Waist circumference (cm)

Explanation: The ratio of height to waist circumference is calculated and used in a simple linear equation to estimate body fat percentage.

3. Importance of RFM Calculation

Details: RFM provides a quick estimate of body fat percentage without specialized equipment, which can be useful for assessing health risks associated with excess body fat.

4. Using the Calculator

Tips: Measure your height and waist circumference accurately. For waist circumference, measure at the narrowest point between the bottom of your ribs and top of your hips.

5. Frequently Asked Questions (FAQ)

Q1: How does RFM compare to BMI?
A: RFM may provide a better estimate of actual body fat percentage than BMI, especially for individuals with high muscle mass.

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 for personalized assessment.

Q3: When would RFM be inaccurate?
A: RFM may be less accurate for very tall or short individuals, athletes, or those with unusual body proportions.

Q4: How often should I measure my RFM?
A: For tracking changes, monthly measurements are typically sufficient as body fat changes slowly.

Q5: Can children use this calculator?
A: RFM was developed for adults and may not be accurate for children. Pediatric growth charts are more appropriate.