BMI Calculator

What is BMI?

Body Mass Index, or BMI as it is commonly known, is used to determine a persons healthy weight range. It is based on height and weight and the formula used to calculate it is:

BMI Formula

BMI = Weight in kilograms / Height in metres ²

Use the BMI calculator below to calculate Body Mass Index then check the results on the chart at the top right of this page. (You can enter your weight into the BMI calculator in either pounds or kilos by switching between the metric and imperial version.)

Switch to the metric BMI calculator

For example, if you were 5 ft 10 in and 14 st it would be entered as 5 in the first field, 10 in the second field and 196 in the third field (14 lb to a stone so 14 x 14 = 196 lb)

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Basic BMI chart

BMI Category
Below 18.5 Underweight
18.5 - 24.9 Healthy weight
25 - 29.9 Overweight
30 - 34.9 Obese
35 - 39.9 Very obese
Over 40 Morbidly obese


Remember BMI is only a guide and even though a BMI may indicate a person is overweight, other factors must be taken into account.

For example, heavily built or muscular people may have a high BMI but this does not necessarily mean that they are overweight or obese.

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