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 provides a more accurate health assessment than BMI alone, as it distinguishes between fat and muscle mass.

2. How Does the NHS Calculator Work?

The calculator uses the NHS-approved formula:

Where:

• BMI — Body Mass Index (weight in kg / height in m²)
• Age — In years (18+)
• Gender — 1 for male, 0 for female

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

3. Importance of Body Fat Percentage

Details: Healthy ranges vary by gender and age, but generally:

• Men: 8-19% (healthy), 20-25% (overweight), 26%+ (obese)
• Women: 21-33% (healthy), 34-39% (overweight), 40%+ (obese)

4. Using the Calculator

Tips:

• Calculate your BMI first (weight in kg / (height in m)²)
• Enter accurate age and select correct gender
• Results are estimates - for precise measurement consult a healthcare professional

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: It provides a reasonable estimate (±3-5%) for most people but may be less accurate for athletes or elderly.

Q2: Why does gender affect body fat percentage?
A: Women naturally carry more essential body fat for reproductive functions.

Q3: What's a healthy body fat percentage for my age?
A: Healthy ranges increase slightly with age. Consult NHS guidelines for age-specific ranges.

Q4: Can I use this calculator if I'm under 18?
A: No, this formula is validated for adults only. Different methods are used for children.

Q5: Where can I get a more accurate measurement?
A: NHS recommends DEXA scans, Bod Pod, or skinfold caliper tests for clinical accuracy.