This BMI calculator works out your body mass index from your height and weight, shows your weight category and gives the healthy weight range for your height. You can use kilograms or pounds, and feet/inches or centimetres.
BMI formula
BMI = weight (kg) ÷ height (m)²
BMI categories for adults (WHO)
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25 – 29.9 | Overweight |
| 30 and above | Obese |
A note for South Asians
Research suggests that people of South Asian origin — including Bangladeshis and Indians — tend to face a higher risk of diabetes and heart disease at a lower BMI. For Asian populations, the WHO has suggested lower action points, with increased risk often considered from a BMI of about 23. If your BMI is between 23 and 25, it is worth talking to a doctor about your waist size, blood pressure and blood sugar.
Example
A person who is 5 ft 6 in (167.6 cm) tall and weighs 65 kg has a BMI of about 23.1, in the normal range.
Frequently asked questions
Does BMI work for everyone?
No. BMI does not separate muscle from fat, so it can overestimate fat in athletes and underestimate it in older people. It is not meant for children and teenagers, who need age- and sex-specific charts, or for pregnant women.
Disclaimer: this tool is for general information only and is not medical advice.