BMI Calculator

The BMI Calculator works out your Body Mass Index from your height and weight, then shows your weight category and the healthy weight range for your height. You can switch between metric units (kilograms and centimetres) and imperial units (pounds and inches) to match whatever you already know, and the result updates as soon as you change a value.

It gives a quick, general sense of where your weight sits — underweight, healthy, overweight or obese — which is useful for anyone tracking a fitness goal or keeping an eye on their health over time. BMI is a screening guide rather than a medical diagnosis, so any significant concern is best discussed with a clinician who can consider the full picture.

Your height and weight are processed entirely in the browser and are never stored or transmitted, which keeps these personal health figures private. There is nothing to install and no account to create, so you can check your number quickly and confidently whenever you want, without sharing anything with a third party.