BMI (Body Mass Index) Calculator

BMI (Body Mass Index) Calculator

Are You Overweight ?

<!-- This script and many more are available free online at --> <!-- The JavaScript Source!! /web/20071106042211/ --> <!-- Created by: Bob Mason :: /web/20071106042211/ --> <!-- Begin function calculateBMI() { var weight = eval(document.form.weight.value) var height = eval(document.form.height.value) var height2 = height / 100 var BMI = weight / (height2 * height2) document.form.BodyMassIndex.value=custRound(BMI,1); } function custRound(x,places) { return (Math.round(x*Math.pow(10,places)))/Math.pow(10,places) } // End -->

Weight (in Kilos) Height (in Cm''s)


It is the view of that the results of The BMI Calculator is not a perfect guide to your weight. The results do not take into consideration your body shape of muscle density.

Please use this as a general guide.

What These Numbers Mean

18 or less 19-24 25-29 30-39 40 or over
Underweight Normal Overweight Obese Dangerously Obese

What Should I Do Now

18 Or Less

If your BMI results were 18 or less you are underweight - there may be an underlying reason for this. A visit to your GP or doctor is recommended. Being underweight can just as unhealthy for you as being overweight.


If you are between these values you should not need to take any action. Although if you are at the bottom end of the value range you may drop into into the underweight zone. Those approaching a BMI of 24 should start to think about controlling their weight.


If you are between these scores then you should seriously contemplate doing something to reduce your weight. As we get older we find it more and more difficult to control our weight and so may creep into the obese range without care.


This range is considered very overweight or obese. Action should be taken to not only give yourself a better quality of life but to prolong it.

40 Or Over

Dangerously obese, not a good postion to find yourself in. If you have a BMI of 40 or over you should make an appointment to visit your GP. Being in this bracket could potentially shorten your life expectancy.