BMI calculator

This page uses the adult WHO cutoffs. A BMI from 18.5 through 24.9 is labeled healthy weight. Below 18.5 is underweight. From 25.0 through 29.9 is overweight. 30.0 and above is obese. Those labels are a table, not a diagnosis. They do not replace a clinician, and they are not meant for children.

In metric, BMI is weight in kilograms divided by height in meters squared. In imperial, the same figure is 703 times weight in pounds divided by height in inches squared. This page rounds the result to one decimal place, then applies the adult WHO labels to that rounded number. The unit toggle only changes the inputs.

BMI is only mass relative to height. It does not know muscle, bone, age, or sex, and it does not see blood tests or symptoms. A high or low number can have many causes. This calculator prints a category from a public table. It does not set calorie targets, diet plans, or exercise, and it is not medical care.

The table is the adult World Health Organization grouping used in many public health notes. Underweight is below 18.5. Healthy weight is 18.5 to 24.9. Overweight is 25.0 to 29.9. Obese is 30.0 and above. The bands are the same for every adult who uses this page. They are a reference, not a personal plan.

No. The numbers you type never leave your browser. There is no account, no save, and no request to a CalcJournal server for the result. Close the tab and the figures are gone. Use the page for a quick look at the public BMI formula, not as a record of your health.