BMI Calculator

Introduction

The BMI calculator estimates Body Mass Index from height and weight using the standard adult formula. It is a screening tool, not a diagnosis of body fatness or health.

Disclaimer: This tool is for informational purposes only and is not professional medical, pharmaceutical, financial, or tax advice. Always verify doses with a licensed clinician or pharmacist.

Formula

Body Mass Index is body weight in kilograms divided by the square of height in meters.

• w — Weight in kilograms (kg)
• h — Height in meters (m)
• BMI — Body Mass Index in kg/m²

Step-by-step

1. Enter your height in centimeters.
2. Enter your weight in kilograms.
3. Convert height to meters by dividing by 100.
4. Square the height in meters.
5. Divide weight by height squared to get BMI.
6. Match the BMI value to an adult category band.

Worked example

For a person who is 170 cm tall and weighs 65 kg: height in meters is 1.70, height squared is 2.89, and BMI is 65 ÷ 2.89 ≈ 22.5 (Normal weight).

Use cases

• Quickly estimate BMI for personal tracking
• Compare results against WHO adult BMI categories
• Understand how height and weight interact in the BMI formula

Frequently asked questions