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How to Calculate Your BMI

Learn how to calculate your body mass index (BMI) -- your body fat measurement based on height and weight -- in this Howcast video.


BMI or body mass index is a number that we calculate to determine of you are a healthy weight. BMI is calculated by taking your weight in kilograms and dividing it by your height in meters squared. This is obviously not a number that we're able to calculate in our heads, so there are tools online that can help you do so.

On our website there's a B-M-I calculator, you can go there and just plugin your height in inches, and your weight in pounds, and it will tell you what your BMI is. A healthy BMI is anywhere between 18 and 25. Over 25, you're considered overweight. Once your BMI reaches 30, you're considered to be obese or to have obesity.

When your BMI reaches 40 or greater, this is when you're diagnosed with class III obesity or morbid obesity. The higher your BMI, the more likely you are to develop other illnesses that are related to being overweight, such as high blood pressure, diabetes, heart disease, sleep apnea, infertility and even cancer. I hope this answered some questions on how to calculate your BMI.

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