BMI Calculator

What is BMI?

BMI, or Body Mass Index, is a measure of body weight relative to height. It's a simple way to estimate whether a person has a healthy body weight for their height. BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters.

BMI Formula and Mathematical Explanation

BMI is calculated using the following formula:

Variable	Meaning	Unit	Typical range
W	Weight	kg	15 - 150+
H	Height	m	1.2 - 2.2

BMI = W / (H * H)

Practical Examples

Example 1

Weight: 70 kg, Height: 1.75 m

BMI = 70 / (1.75 * 1.75) = 22.86 (Normal weight)

Example 2

Weight: 90 kg, Height: 1.65 m

BMI = 90 / (1.65 * 1.65) = 32.35 (Obesity)