Check your Body Mass Index in seconds — with your category and the healthy weight range for your height.
Free tool — your height and weight are used only in your browser. Nothing is sent anywhere.
Body Mass Index, or BMI, is the quickest way to check whether your weight is in a healthy range for your height. Doctors, gyms and health apps all use it as a first check. This free BMI calculator works it out in seconds: enter your height and weight in metric or imperial units, and it shows your BMI number, your category — underweight, healthy, overweight or obese — and the healthy weight range for your height. It is a starting point, not a diagnosis: muscle, age, pregnancy and some medical conditions can change what the number means, so treat it as a guide and talk to a doctor for personal advice. The calculator is free, needs no sign-up, and nothing you enter is saved or sent anywhere.
For most adults, a BMI of 18.5 to 24.9 is considered healthy. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
BMI is a useful first check, but it does not measure body fat directly. Very muscular people, athletes, pregnant women and older adults can get a misleading result, so use it as a guide, not a final verdict.
BMI is your weight in kilograms divided by your height in metres squared. The calculator does the maths for you in either metric or imperial units.
If your BMI is well outside the healthy range, or you have other health concerns, a doctor or nutritionist can give advice that fits your body and health history.
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