Body Mass Index

Calculate your Body Mass Index by simply entering in your height in centimetres and weight in kilograms.

Enter your height and weight below and click "Calculate" to get your BMI.

kg and cm lbs and inches

What is BMI?

FYI, your BMI is PDI. Huh? Would you like a translation? Here it is: For your information (FYI), your body mass index (BMI) is pretty darn important (PDI).

Did you know you had a BMI? Body mass index is a calculation that uses your height and weight to estimate how much body fat you have.

Too much body fat is a problem because it can lead to illnesses and other health problems. BMI, although not a perfect method for judging someone's weight, is often a good way to check on how healthy you are and a good way to start with your health-improvement program.

Calculating BMI

The best way to determine your BMI is to have your doctor do it for you. That way, you'll know the number is accurate and your doctor can discuss the result with you. If you're interested, you also can figure out your BMI on your own.

If you want to check what sort of shape you're in, the Body Mass Index (BMI) Calculator below is a useful guide. It will tell you if you're a healthy weight for your height. Just enter your height and weight in the BMI Calculator, click on English or Metric, then click to calculate.

Interpreting Results

Remember that information the calculator provides is only a guide and it's aimed at healthy adults. It isn't suitable for children, young people or older people.

Also, if you have well-developed muscles, you may find that you will fall into the category of overweight on the Body Mass Index calculator, when in fact you may have a healthy body shape and very little fat.


  • Less than 19: UNDERWEIGHT - You are under optimum weight for your height. You could afford to gain a little weight.
  • 20 - 25: ACCEPTABLE - You have a healthy weight for your height.
  • 26 - 30: OVERWEIGHT - You are over optimum weight for your height. You may be facing health problems, so losing some weight would be a good idea.
  • 31+: OBESE - You are over optimum weight for your height. You may be facing health risks, so see your doctor to help you achieve a healthier weight.

Whatever the results show, the most important thing to remember is that you need to make sure you're eating a healthy balanced diet and keeping physically active.