About BMI Calculator
Body mass index (BMI) is a screening measure of weight relative to height: BMI = weight in kg ÷ height in m squared. WHO adult categories are underweight below 18.5, normal 18.5 to 24.9, overweight 25 to 29.9, and obese 30 and above. The Asia-Pacific cut-offs are also shown: overweight from 23, obese from 25. BMI does not separate muscle from fat and is not meant for children or pregnancy. General estimate, not medical advice.
Also known as: Adult BMI Calculator, BMI Calculator for Women.
How to use BMI Calculator
- Fill in "Weight" and "Height".
- The result appears below and updates as you type.
- Copy the result with the copy button, or download it as a file where that is offered.
Questions about BMI Calculator
Is BMI calculated differently for women and men?
No. The formula and the WHO adult categories are the same for both sexes. Women typically carry more body fat than men at the same BMI, which is one reason BMI is only a screening measure.
Why are there separate Asia-Pacific cut-offs?
Research found that health risks such as type 2 diabetes rise at lower BMI values in many Asian populations. A WHO expert consultation therefore suggested lower action points, with overweight from 23 and obesity from 25.
How do I enter height in feet and inches?
Convert to centimetres first: multiply feet by 30.48 and inches by 2.54, then add them. 5 ft 6 in is 152.4 + 15.24 = 167.6 cm. For weight, divide pounds by 2.2046 to get kilograms.
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