BMI Calculator

Body mass index from your height and weight. Pick the unit for each — centimetres or feet, kilograms or pounds — and see the category it falls in and the healthy weight range for your height.

Height

Weight

BMI is a screening measure, not a diagnosis. It compares weight to height and nothing else — it cannot tell muscle from fat, or say where weight is carried. Very muscular people often read as “overweight” on it. Talk to a doctor about what your figure means for you.

Your height and weight stay in your browser. Nothing is uploaded.

How to Use the BMI Calculator

Enter your weight and pick kilograms or pounds.
Enter your height and pick centimetres or feet.
Read your BMI value and the range it falls in.

What You Can Do

Switch each field between metric and imperial units, and the number you typed is converted rather than relabelled.
Enter height in feet and inches or in centimetres, whichever you know.
See which reference range the result falls in.
Nothing you type is stored or sent anywhere.

Frequently Asked Questions

How is BMI calculated?

BMI divides weight in kilograms by height in metres squared. Imperial measurements are converted to metric first.

What does my BMI number mean?

It places you on a general reference scale used for populations. It says nothing about body composition on its own.

Is BMI accurate for everyone?

No. It does not distinguish muscle from fat, and it is a poor guide for athletes, children, pregnant people and older adults.

Should I make health decisions based on BMI?

No. Treat it as one rough figure among many and speak to a qualified healthcare professional about anything that concerns you.

This calculator is for general information only. Body Mass Index is a rough population-level measure, not a medical diagnosis, and it cannot tell muscle from fat. Speak to a qualified healthcare professional about your health.