BMI Calculator
Body Mass Index compares your weight to your height using a single ratio. It's a fast screening number, not a diagnosis — it doesn't know your muscle mass, frame, or age. Use it as a starting point, not a verdict.
Enter your height and weight to see your result and healthy weight range.
How it's calculated
BMI = weight in kilograms ÷ (height in metres)². The formula dates to the 1830s and was built for population studies, not individual diagnosis — it treats a bodybuilder and a sedentary adult of the same height and weight identically. The World Health Organization's adult bands are: below 18.5 underweight, 18.5–24.9 healthy weight, 25–29.9 overweight, 30 and above obese. Pregnant people, children, and very muscular or very tall/short adults should weigh this number lightly and talk to a clinician for anything more specific.