BMI Calculator
Your body mass index from your height and weight, in metric or imperial units, its WHO category and the healthy weight range for your height
cm
Enter a height from 50 to 250 cm.
kg
Enter a weight from 10 to 400 kg.
ft
in
Enter a height from 1 ft 8 in to 8 ft 2 in, the inches under 12.
lb
Enter a weight from 22 to 880 lb.
BMI
WHO category
Normal weight for your height
To a normal weight
Categories
| BMI | Category | Weight for your height |
|---|---|---|
| under 18.5 | Underweight | — |
| 18.5 – 24.9 | Normal weight | — |
| 25 – 29.9 | Overweight | — |
| 30 – 34.9 | Obesity, class I | — |
| 35 – 39.9 | Obesity, class II | — |
| 40 and over | Obesity, class III | — |
The body mass index is the weight in kilograms divided by the square of the height in meters. It's a quick guide to whether a weight suits a height, used for adults from 18.
It can't tell muscle from fat: it reads high for athletes and can read normal for older people who have lost muscle. It isn't for children and teenagers, whose doctors use growth charts by age and sex, nor during pregnancy. For people of Asian descent, the WHO suggests acting from a BMI of 23. Ask a doctor about your own weight.