Health
A screening-level Adult BMI calculator, with the World Health Organization thresholds and NHS guidance behind it explained in plain terms.
Calculate Body Mass Index for an adult aged 18 or over, from height and weight in metric or imperial units.
Conventions and limitations
BMI here is a screening measure only, not a diagnosis, and the standard adult ranges are not adjusted for ethnicity, pregnancy or eating-disorder history. See the calculator's own limitations for details.