BMI healthy weight calculator

A good way to check if you're a healthy weight is to use the Body Mass Index (BMI). Your BMI is a measure of whether you're a healthy weight for your height. It can indicate whether you're at raised risk of the serious health problems that are linked to being overweight, such as type 2 diabetes, heart disease and certain cancers.

For further reading on BMI, click here.

To understand the results, it helps to know how they are calculated.

Adult results

For adults, the body mass index (BMI) is used to calculate whether a person is underweight, a healthy weight, overweight or obese for their height. BMI allows for natural variations in body shape, giving a healthy weight range for a particular height. The calculation divides the adult's weight in kilograms by their height in metres squared.

Black, Asian and other minority ethnic groups

Please be aware that members of black, Asian and other minority ethnic groups are likely to be at increased risk of health problems at a lower BMI than the white population (i.e. below BMI 25).

Eating disorders

Please note, that if you are suffering from an eating disorder, body mass index and the results provided by the BMI calculator do not apply. Please seek further advice from your GP.

Child results

For children, BMI varies a lot with age, so the child's age (and whether they are a boy or a girl) have to be taken into account. To do this, the BMI is covered into a BMI centile, as on a child growth chart. The BMI centile then indicates whether a child's BMI is within the healthy range or not.

NHS Choices 2013 BMI healthy weight calculator