BMI Calculator

Free online BMI Calculator

Your BMI, or Body Mass Index, provides a simple numeric measure of your "fatness" or "thinness".
BMI is based on your weight to height ratio and our free BMI calculator below
uses the internationally recognised formula to calculate your BMI index.

BMI Calculator

Use our free BMI calculator to find your body mass index. Simply enter your height and weight, click "Calculate BMI" and then see where you are on the WHO scale on the right.

The World Health Organisation
has issued the following
classifications for BMI:-

  Classification BMI
Severe thinness <16.00
Moderate thinness 16.00 - 16.99
Mild thinness 17.00 - 18.49
Normal range 18.50 - 24.99
Pre-obese 25.00 - 29.99
Obese class I 30.00 - 34.99
Obese class II 35.00 - 39.99
Obese class III >40.00

Enter your height:

feet inches

Enter your weight:
You can enter your weight in pounds and leave the stones box blank

stones pounds



Your BMI index is:

See our Diet Chart - which automatically calculates your BMI and plots it on a graph as your weight changes. A separate graph also shows your weight loss compared to your target to help you get to the weight you want to be - a great motivational tool!

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BMI Calculator

You can use this BMI calculator free but for a simpler solution see our new Diet Chart
Diet Chart with built in BMI Calculator

This helps you monitor your weight loss AND automatically calculates your BMI and creates a graph of your weight loss and BMI as you progress.

The Diet Chart - a simple to use and powerful motivational tool

BMI Calculator