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BMI calculator

Enter your weight and height. You see your BMI, its category according to the World Health Organization and the healthy weight range for your height.

It is a general guide for adults. It is not a substitute for advice from a health professional.

How it's calculated

BMI = weight in kilos ÷ (height in metres × height in metres).
Under 18,5 is underweight. 18,5 to 24,9 is a healthy weight. 25 to 29,9 is overweight. 30 and over is obesity.
The healthy weight range is the one that gives a BMI between 18,5 and 24,9 at your height.

An example

Someone who weighs 70 kg and is 1,75 m tall has a BMI of 22,9: a healthy weight.

At that height, a healthy weight is 56,7 to 76,3 kg.

Frequently asked questions

What is a normal BMI?

For the WHO, a BMI between 18,5 and 24,9 in adults. The range is the same for women and men.

Does BMI work for everyone?

No. It can't tell muscle from fat, so very muscular people may score high. It is also used differently in pregnancy and for children and teenagers.

How do I work out BMI in pounds and inches?

Multiply your weight in pounds by 703, then divide by your height in inches squared. At 5 ft 9 in, that is 69 × 69.

Key terms

BMI: Body mass index: how your weight relates to your height.
WHO: World Health Organization, which sets the adult BMI categories.

The same calculation in other countries

Up-to-date official data

We check the official sources automatically, every day.

See all sources

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