Free BMI Calculator

This free bmi calculator will determine your body mass index based on your weight and height.

You can select from either imperial measurements like feet and inches, or metric such as meters and centimeters.


  1. Enter your height in feet/inches or meters/centimetres
  2. Enter your weight. If you choose kilograms or stones enter a decimal point as required. For example, if you weigh 11 stone 7lbs enter “11.5”.

Once you’ve used the free bmi calculator, use the table below to determine what your score means. But remember that body mass index has its limitations.

Your height: :

Your weight:

Press click, do not press enter

Your Body Mass Index is :


Look at the bmi chart below to see what your score means


Risk of Associated Disease According to BMI and Waist Size

BMI Waist less than or equal to
40 in. (men) or
35 in. (women)
Waist greater than
40 in. (men) or
35 in. (women)
18.5 or less Underweight N/A
18.5 – 24.9 Normal N/A
25.0 – 29.9 Overweight Increased High
30.0 – 34.9 Obese High Very High
35.0 – 39.9 Obese Very High Very High
40 or greater Extremely Obese Extremely High Extremely High

There are two extra columns on this bmi chart for waist measurement. Physicians often use waist measurements alongside bmi to determine if you are at an increased risk from certain degenerative illnesses.