1. What is Body Fat Percentage?

Body fat percentage is a measure of fitness level that calculates the proportion of fat to total body weight. This calculator uses the U.S. Navy body fat formula, which is based on body circumference measurements.

2. How Does the Calculator Work?

The calculator uses the body fat percentage formula for women:

Where:

• \( waist \) — Waist circumference at narrowest point (cm)
• \( hip \) — Hip circumference at widest point (cm)
• \( neck \) — Neck circumference below larynx (cm)
• \( height \) — Height in centimeters (cm)
• \( \log \) — Logarithm base 10

Explanation: The equation estimates body fat percentage based on the relationship between body circumferences and height.

3. Importance of Body Fat Measurement

Details: Body fat percentage provides a more accurate assessment of fitness than BMI alone, as it distinguishes between fat mass and lean body mass.

4. Using the Calculator

Tips: For accurate results, measure circumferences with a flexible tape measure while standing relaxed. All measurements should be in centimeters.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The Navy method is reasonably accurate (±3%) for most people but may be less accurate for athletes or those with very high/low body fat.

Q2: What are healthy body fat ranges 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 taken in the morning before eating, with normal hydration levels. Avoid measuring right after exercise.

Q4: Are there limitations to this method?
A: May not account for body shape variations and tends to overestimate fat in very muscular individuals.

Q5: How often should I measure body fat?
A: Every 4-8 weeks is sufficient to track changes, as daily fluctuations can occur due to hydration and other factors.