1. What is Body Fat Percentage?

Body fat percentage is the proportion of fat to total body weight. It provides a more accurate assessment of body composition than BMI alone, helping to evaluate health risks associated with weight.

2. How Does the Calculator Work?

The calculator uses the NHS body fat percentage formula:

Where:

• \( BMI \) — Body Mass Index (unitless)
• \( age \) — Age in years
• \( sex \) — 1 for male, 0 for female

Explanation: This equation estimates body fat percentage based on BMI, age, and sex, providing a quick assessment of body composition.

3. Importance of Body Fat Percentage

Details: Monitoring body fat percentage helps assess health risks associated with obesity and underweight conditions. It provides insight into body composition beyond simple weight measurements.

4. Using the Calculator

Tips: Enter your BMI value (calculated from height and weight), age in years, and select your sex. All values must be valid (BMI > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this body fat calculation method?
A: While convenient, this formula provides an estimate. For precise measurements, methods like DEXA scans or hydrostatic weighing are recommended.

Q2: What are healthy body fat percentage ranges?
A: For men: 6-24%, For women: 16-30%. These ranges vary by age and fitness level.

Q3: How often should I measure my body fat percentage?
A: Monthly measurements are sufficient for tracking changes. Daily fluctuations are normal and not meaningful.

Q4: Can this formula be used for athletes?
A: Athletes may have different body composition. Specialized formulas or direct measurement methods are recommended for athletes.

Q5: Why does the formula include age and sex?
A: Body fat distribution changes with age, and men and women naturally have different body fat percentages due to physiological differences.