1. What is a BMI Calculator?

Definition: BMI (Body Mass Index) is a measure of body fat based on height and weight that applies to adult men and women.

Purpose: It helps assess whether a person has a healthy body weight for their height.

2. How Does the BMI Calculator Work?

The calculator uses the formula:

Where:

• \( BMI \) — Body Mass Index (kg/m²)
• \( W \) — Weight (kilograms)
• \( H \) — Height (meters)

Explanation: Your weight in kilograms is divided by the square of your height in meters.

3. BMI Categories

Details:

• Underweight: BMI < 18.5
• Normal weight: BMI 18.5-24.9
• Overweight: BMI 25-29.9
• Obesity: BMI ≥ 30

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for everyone?
A: BMI may not accurately reflect body fat in athletes (high muscle mass) or elderly (loss of muscle mass).

Q2: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy.

Q3: Can children use this calculator?
A: Children need age- and sex-specific BMI charts as their body composition changes with growth.

Q4: How do I convert pounds to kilograms?
A: 1 pound = 0.453592 kilograms. Divide pounds by 2.205 for approximate conversion.

Q5: How do I convert feet/inches to meters?
A: 1 foot = 0.3048 meters, 1 inch = 0.0254 meters. Example: 5'7" = (5×0.3048) + (7×0.0254) = 1.7018 meters.