Body Mass Index

Your Body Mass Index or BMI is a good way for you to check if you’re a healthy weight.

For adults BMI is used to measure if you’re a healthy weight for your height meaning the calculation takes into account that all people are different shapes and sizes.

Calculating your BMI

To calculate your BMI, you'll need to know your weight in kilos and your height in metres, then follow the example below:

Step One: Multiply your height in metres by itself, eg 1.7x1.7= 2.89

Step Two: Divide your weight in Kilos by this figure, e.g 80 ÷ 2.89 = 27.7

Step Three: For this example 27.7 is your BMI

What does your BMI mean?

Below 18.5:

A score this low means that you may be underweight. There are a number of possible reasons for this. Your GP can help you find out more, and achieve a healthy weight.

18.5-24.9:

This is a healthy range. It shows that you're a healthy weight for your height.

25 or more:

Your BMI is above the ideal range and this score means you may be overweight. This means that you're heavier than is healthy for someone of your height. Excess weight can put you at increased risk of heart disease, stroke and Type 2 diabetes. Find out more information on what a healthy balance should include.

30 or more:

A BMI above 30 is classified as obese. Being obese puts you at a raised risk of health problems such as heart disease, stroke and Type 2 diabetes. Losing weight will bring significant health improvements. Find out more information on what a healthy balance should include.