1. What is Body Fat Percentage?

Body fat percentage is the total mass of fat divided by total body mass. It provides a more accurate assessment of body composition than BMI alone. The calculator uses the U.S. Navy body fat formula specifically designed for women.

2. How Does the Calculator Work?

The calculator uses the U.S. Navy body fat formula for women:

Where:

• \( Waist \) — Waist circumference at navel (inches)
• \( Hip \) — Hip circumference at fullest point (inches)
• \( Neck \) — Neck circumference below larynx (inches)
• \( Height \) — Height in inches

Explanation: The equation accounts for the relationship between body circumferences and height to estimate body fat percentage.

3. Importance of Body Fat Measurement

Details: Knowing your body fat percentage helps assess health risks, track fitness progress, and set appropriate weight management goals. It's more accurate than BMI for evaluating body composition.

4. Using the Calculator

Tips: Measure circumferences with a flexible tape measure while standing relaxed. For waist, measure at the narrowest point (or at navel if no narrowing). For hip, measure at the fullest part. All measurements should be in inches.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The U.S. Navy method is about ±3% accurate compared to DEXA scans when measurements are taken properly.

Q2: What are healthy body fat percentages for women?
A: Essential fat: 10-13%, Athletes: 14-20%, Fitness: 21-24%, Average: 25-31%, Obese: 32%+.

Q3: When should measurements be taken?
A: Best in the morning before eating, after using the bathroom. Avoid measuring right after exercise.

Q4: Are there limitations to this method?
A: Less accurate for very muscular individuals, pregnant women, or those with unusual body shapes.

Q5: How often should I measure?
A: For tracking progress, every 2-4 weeks is sufficient as body fat changes slowly.