BMI Calculator

Calculate your body mass index (BMI) with this handy, free weight calculator tool. By calculating your body mass index, you can get an indication of whether your weight may be affecting your health. BMI is commonly used by Doctors and health professionals worldwide and is calculated using your weight and height. I have provided two calculation choices - metric and imperial.

1) Metric

2) Imperial

What is BMI? How is BMI calculated?

BMI Classifications (International)

BMI of less than 18.5kg/m²

A BMI of less than 18.5 indicates that you are underweight, so you may need to put on some weight. You are recommended to ask your Doctor or a dietician for advice.

BMI of 18.5 - 25kg/m²

A BMI of 18.5 - 25 indicates that you are at a healthy weight for your height. By maintaining a healthy weight, you lower your risk of developing serious health problems.

BMI of 25 - 30kg/m²

A BMI of 25 - 30 indicates that you are slightly overweight. You may be advised to lose some weight for health reasons. You are recommended to talk to your Doctor or a dietician for advice.

BMI of over 30kg/m²

A BMI of over 30 indicates that you are heavily overweight. Your health may be at risk if you do not lose weight. You are recommended to talk to your Doctor or a dietician for advice.

Note:

The results given by this weight calculator should be used only as a guide and should not replace medical advice. Please bear in mind that, when interpreting the results of this body mass index calculator, other factors such as muscle structure and ethnic origin should be considered. For example, a person with a lot of muscle might have a higher BMI, when their body is actually perfectly healthy, due to the fact that muscle weighs more than fat.

Always speak to a Doctor or health professional for advice and guidance before making any dramatic changes to your lifestyle.

Whilst every effort has been made in building this body mass index (BMI) calculator, I am not to be held liable for any special, incidental, indirect or consequential damages or monetary losses of any kind arising out of or in connection with the use of the converter tools and information derived from the web site. This BMI calculator is here purely as a service to you, please use it at your own risk. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate conversions. Please see the disclaimer for more information.