BMI Calculator — Body Mass Index for Adults
Free BMI calculator. Calculate your body mass index in kg/cm or lb/inches and see the WHO category. Includes a note on Asian BMI cut-offs.
Runs in your browser — your data is never uploaded.
Body Mass Index (BMI) compares your weight with your height. Enter your measurements in metric or imperial units to see your BMI and its WHO category. BMI is a screening tool for adults — it does not measure body fat or muscle and is not a diagnosis, so speak to a doctor for health advice. Some guidelines use lower cut-offs for South Asian populations.
How to use the BMI Calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Read your BMI and category.
BMI Calculator — frequently asked questions
What is a healthy BMI?
The WHO range for a normal weight adult is 18.5 to 24.9.
Is BMI accurate for athletes?
Not always. Muscle weighs more than fat, so muscular people can have a high BMI without excess fat.
Is it suitable for children?
No. Children and teenagers need age- and sex-specific growth charts.
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