BMI Calculator

Units

Height (cm)

Weight (kg)

Enter your height and weight.

About this BMI calculator

This free BMI calculator works out your Body Mass Index from your height and weight, in either metric (centimetres and kilograms) or US units (feet, inches, and pounds). BMI is a simple, widely used screening number that estimates whether your weight is in a healthy range for your height. The result updates instantly in your browser and nothing is stored.

BMI is grouped into ranges: under 18.5 is underweight, 18.5 to 24.9 is a normal weight, 25 to 29.9 is overweight, and 30 or above is in the obese range. BMI is a general guide, not a diagnosis, and it does not account for muscle, build, age, or sex, so treat it as a starting point and talk to a health professional for personal advice.

How to use it

Pick your unit system, enter your height and weight, and read your BMI and category instantly.

Frequently asked questions

How is BMI calculated?

BMI is your weight in kilograms divided by your height in metres squared. The tool also converts US units for you.

What is a healthy BMI?

A BMI between 18.5 and 24.9 is generally considered a healthy range.

Is BMI accurate for everyone?

BMI is a general guide and does not account for muscle or build, so treat it as a starting point.