BMI Calculator
BMI Calculator
Body mass index from your height and weight, with the standard category ranges.
Estimate only, not medical advice. BMI is a rough screening number. It does not measure body fat or account for muscle, age or ethnicity. Talk to a clinician about what it means for you.
Free to use and save. A free account keeps your results in your private journal, and the ads on the calculator pages are hidden while you are signed in.
How this is calculated
BMI is weight in kilograms divided by height in meters squared. Categories follow the World Health Organization adult ranges: under 18.5, 18.5 to 24.9, 25 to 29.9, and 30 and over. These ranges are the same for adult men and women, and do not apply to children and teens, who are assessed on CDC growth charts by age and sex. The range line converts the 18.5, 25 and 30 cutoffs into weights for your height. Everything is calculated in your browser, and nothing you enter is stored or sent anywhere.