BMI Calculator
Body Mass Index is a quick way to see whether your weight is in a healthy range for your height. Enter your height and weight below — the result appears instantly, with the standard category for your score.
Your result will appear here
Your BMI
This is a general guide, not medical advice. BMI does not account for muscle mass, age, or body composition — talk to a doctor if you have concerns about your weight.
How to use
- Enter your height in centimetres and your weight in kilograms.
- Click Calculate BMI.
- Read your BMI value, your category, and where you sit on the scale.
Frequently asked questions
What is BMI?
BMI (Body Mass Index) is your weight in kilograms divided by the square of your height in metres. It is a simple screening measure used around the world to group adults into weight categories.
What are the BMI categories?
Under 18.5 is Underweight, 18.5–24.9 is Normal, 25–29.9 is Overweight, and 30 or above is Obese. These are the standard World Health Organization cut-offs for adults.
Is BMI accurate for everyone?
Not always. Very muscular people can score as overweight despite low body fat, and BMI works less well for children, older adults, and pregnant people. Treat it as a rough guide, not a diagnosis.
What should I do if my BMI is outside the normal range?
Do not panic over a single number — but it is worth talking to a doctor or dietitian, who can look at your overall health, diet, and activity and suggest realistic next steps.