Enter your height and weight in metric or imperial units to see your body mass index, its WHO category and the healthy weight range for your height.
Runs in your browser — nothing is uploaded
Your BMI
23.5
Category (WHO adults)
Healthy weight
Healthy weight at this height
53.5 kg – 72.0 kg
BMI uses the adult cut-offs published by the World Health Organization. It does not measure body fat, so athletes and older adults may be misclassified. Children and teenagers need age-specific percentile charts instead.
Body mass index divides weight in kilograms by the square of height in metres. It is a quick population-level screen that tracks body fat reasonably well for most adults, which is why health services use it to flag people who may benefit from a closer look at weight-related risk.
The categories use the adult cut-offs published by the World Health Organization: below 18.5 is underweight, 18.5 to 24.9 is a healthy weight, 25 to 29.9 is overweight, and 30 or more is obesity, divided into three classes. The healthy range shows the 18.5 to 24.9 band in kilograms or pounds for your height.
BMI is a screening number, not a diagnosis. It cannot separate muscle from fat or show where fat is carried, and it is not designed for children, teenagers or pregnant people, who need other measures.
BMI equals weight in kilograms divided by height in metres squared. In imperial units, multiply weight in pounds by 703 and divide by height in inches squared. For example, 68 kg at 1.70 m gives 68 ÷ (1.70 × 1.70), which is 23.5.
The WHO range for most adults is 18.5 to 24.9. At population level, that band is linked to the lowest average risk for many conditions. An individual result still depends on fitness, muscle mass and where fat is stored, so treat the category as a starting point.
Often not. Muscle weighs more than fat, so a lean, muscular person can land in the overweight range. Waist circumference, body-fat percentage or a DXA scan give a fuller picture when BMI seems misleading.
No. Body fat changes with age and sex during childhood, so adult cut-offs do not apply. Clinicians use BMI-for-age percentile charts, such as the CDC or WHO growth references, for anyone under 18.
It converts the healthy BMI band into a weight at your exact height, which is easier to picture than a ratio. Weight targets are best set with a clinician when there are medical conditions or medication involved.
No. The numbers stay in the page while it is open and are not sent to a server or saved in your browser.