1. What is BMI and Body Fat Calculation?

Body Mass Index (BMI) is a measure of body fat based on height and weight. Body fat percentage is a more precise measurement of body composition that estimates the proportion of fat to total body weight.

2. How Does the Calculator Work?

The calculator uses the following formulas:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters
• \( age \) — Age in years
• \( sex \) — 1 for male, 0 for female

Explanation: The formula provides an estimate of body fat percentage based on BMI, age, and sex. Muscle mass is estimated by subtracting fat mass from total weight.

3. Importance of BMI and Body Fat Measurement

Details: Monitoring BMI and body fat percentage helps assess health risks associated with weight, track fitness progress, and guide nutrition and exercise plans.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, age in years, and select sex. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this body fat calculation?
A: This formula provides a reasonable estimate but may not be as accurate as specialized methods like DEXA scans or hydrostatic weighing.

Q2: What is a healthy BMI range?
A: For adults, a BMI of 18.5-24.9 is considered normal weight, 25-29.9 is overweight, and 30+ is obese.

Q3: What are healthy body fat percentages?
A: For men, 6-24% is generally healthy; for women, 16-30% is typically considered healthy.

Q4: Why does the formula include age?
A: Body composition changes with age, typically increasing fat mass and decreasing muscle mass.

Q5: Can athletes get inaccurate results?
A: Yes, athletes with high muscle mass may have elevated BMI that doesn't accurately reflect their body composition.