1. What is Body Fat Percentage?

Definition: Body fat percentage is the proportion of fat in your body compared to your total body weight.

Purpose: It helps assess health risks associated with body composition, beyond what BMI alone can indicate.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• BMI — Body Mass Index (weight/height²)
• Age — In years (18+)
• Gender — Biological sex for adjustment

Explanation: This formula estimates body fat percentage based on BMI with adjustments for age and gender.

3. Importance of Body Fat Percentage

Details: Helps identify health risks, track fitness progress, and provides more accurate health assessment than weight alone.

4. Using the Calculator

Tips: Enter your BMI (calculate separately if unknown), age (18+), and gender. For most accurate results, use recent measurements.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: It provides a reasonable estimate but may differ from clinical measurements by ±3-5%.

Q2: What's a healthy body fat percentage?
A: For men: 8-19% (healthy), 20-25% (overweight); For women: 21-33% (healthy), 34-39% (overweight).

Q3: Why does age affect body fat percentage?
A: Metabolism slows with age, and body composition naturally changes, requiring different healthy ranges.

Q4: Where can I get my BMI?
A: Use our NHS BMI Calculator or calculate as weight(kg)/height(m)².

Q5: Is this calculator suitable for athletes?
A: It may underestimate body fat for very muscular individuals who have high BMI but low body fat.