BMI Calculator

Find out your BMI, and what it means, with our easy calculator.

BMI Calculator

Choose your measurement preference then enter your height and weight to calculate your BMI

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Metres

Stones & Pounds /
Feet & Inches

Pounds /
Feet & Inches

Height: m
Weight: kg


 

Please enter your height and weight.

What is BMI?

BMI stands for body mass index which is a formula which relates Body Weight to height. This enables people to determine whether they are at a weight which is healthy for them.

What Your BMI Calculation Means

Under 18.5* Underweight
18.5* - 25 Healthy Weight
25 - 30 Overweight
30 - 40 Obese
Over 40 Severely obese

* There are two different ranges for healthy BMI put forward by different, but respected, sources. The British Nutrition Foundation, for example, gives 20-25 as healthy range and less than 20 as underweight. The Food Standards Agency's BMI calculator gives 18.5-25 as healthy and less than 18.5 as underweight. Cancer Research UK gives both ranges in different sections of its website. It seems that we can be a bit relaxed about a BMI of between 18.5 and 20, and not start worrying about being underweight unless BMI is less than 18.5. Having said that, we would not recommend that anybody with a current BMI of less than 20 should try to lose weight.

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Created: 01.06.04 | Updated: 04.08.09