Get your body mass index, its WHO band and the healthy weight range for your height.
Your files are processed in your browser, on your own device. Nothing is uploaded to a server.
Enter your height and weight and this BMI calculator returns your body mass index to one decimal place, the World Health Organization band it falls in, and the healthy weight range for your height. Metric and imperial units are both covered, with feet and inches in their own boxes.
The range next to the number is often the more useful half. It shows the weights that would put the same height inside the normal band, so you can see how far a target sits from where you are now.
If the figure lands close to a band edge, small changes in the weight you type will move it across the line. That is normal for a screening measure with fixed cut-offs, and it is one more reason to read the band as a range rather than a label.
The adult bands come from the World Health Organization. Below 18.5 is underweight, 18.5 to 25 is the normal range, 25 to 30 is overweight, and 30 or above is obese, split into classes I, II and III as the figure climbs.
This page also shows the finer thinness classes under 18.5 that many calculators skip: severe below 16, moderate from 16 to 17, and mild from 17 to 18.5. Two people can both be labelled underweight and be a long way apart.
BMI is worked out from weight divided by height squared. It is a population screening measure, built to flag ranges worth a closer look across large groups, and one number is then applied to one person at a time.
BMI is a screening number, not a diagnosis. It does not separate muscle from fat, so a strength athlete with little body fat can land in the overweight band on muscle alone. It also says nothing about where fat is carried, which matters for health.
The bands are adult bands. They do not apply to children or teenagers, whose readings are judged against growth charts for their age, and BMI is not used during pregnancy. If your figure worries you, it is a prompt for a proper check with a clinician, not a verdict.
Nothing you type leaves your device. The calculation runs in your browser, nothing is stored, and there is no sign-up or usage limit.
Weight in kilograms is divided by height in metres squared. In imperial units the same idea runs on pounds and inches with a conversion factor. This page handles both and shows the result to one decimal place.
The World Health Organization puts the normal adult range at 18.5 to 25. Below that is underweight, 25 to 30 is overweight, and 30 or more is obese. This page also shows the healthy weight range for your own height.
Because the formula only knows weight and height. Muscle weighs more than the same bulk of fat, so a muscular build can push the figure into a higher band even with low body fat. The number is a screen, not a judgement.
No. The bands on this page are adult bands. Children and teenagers are assessed against percentiles for their age and stage of growth, which is a different chart entirely. A clinician or school nurse can read those properly.
No, BMI is not used during pregnancy, since the weight includes the baby and the changes that come with it. Weight in pregnancy is tracked against pre-pregnancy figures and midwife guidance instead.
The page shows the weight range that matches the normal band for your height. Treat it as a broad guide rather than a personal target, and talk to a clinician before chasing the edge of any range.
Same rules as this one: free, in your browser, with nothing uploaded.
Exact age in years, months and days for any form.
Marks, discounts and change, worked out properly.
Monthly loan payment, total interest and full cost.
The final price after a discount, and what you saved.
Add or remove GST at the rate your invoice uses.
Add tax to a price or pull it back out.
Work out a tip and split a bill between people.
See how savings grow when interest earns interest.