BMI Calculator

Calculate Your BMI

Body Mass Index (BMI)


Simply enter your height and weight, being careful to specify the measures (i.e feet and inches or metres and centimeters for height, and stones and pounds or kilos and grams for weight).


  1. If you are 6 foot and 1 inches tall, then enter 6.1
  2. If you are 1.83 metres tall then enter 1.83
  3. If you are 14 stones and 4 pounds in weight, then enter 14.4

Then hit the calculate button. We'll do some magic behind the scenes and give you your BMI in a flash.

Body Mass Index (BMI)

The Body Mass Index (BMI) is a statistical measurement which compares a person's weight and height. Though it does not actually measure the percentage of body fat, it is used to estimate a healthy body weight based on how tall a person is.

Due to its ease of measurement and calculation, it is the most widely used diagnostic tool to identify weight problems within a population, usually whether individuals are underweight, overweight or obese.

BMI Categories:

  • Underweight = less then 18.5
  • Normal weight = between 18.5-24.9
  • Overweight = between 25-29.9
  • Obesity = between 30 - 34.9
  • Very Obese = over 35

You should, ideally, be aiming for a BMI around the 20 - 22 mark - which is comfortably within the normal weight category.

You should also be aware of the limitations of the BMI calculation. The BMI is dependent only upon weight and height, it makes simplistic assumptions about distribution of muscle and bone mass, and therefore should only be taken as a guideline for certain groups of people e.g Elderly, athletes. An athlete may appear to have a high BMI, indicating that they are overweight, but this is due to athletes having a high muscle density instead. Muscle weighs more than fat.