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What formula is used to calculate BMI?

BMI = (
Weight (lbs.)

Height (in.) x Height (in.)
) x 703

For example, if an adult weighs 190 pounds and is 5 feet 10 inches tall, he has a BMI of 27.

How did we do it? First, convert his height to inches only. 5 feet 10 inches is 70 inches. Multiply 70 times 70, which equals 4900. Divide his weight in pounds, 190, by 4900 which equals 0.039. Multiply 0.039 by 703 which equals 26.714 (which we round up to 27).

The BMI formula is pretty easy to calculate (and even memorize!) once you try it a few times.

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This BMI (Body Mass Index) calculator is for informational purposes only. You should discuss any concerns you may have about your weight, weight loss, or changes to your diet with your doctor.
Never make any changes to your diet or exercise regimen without consulting your physician. BMI calculations do not take all factors into consideration and can often be incorrect, especially for people less than five feet tall, the elderly or those with muscular builds. The BMI calculator on this page is designed for adults only and should never be used to attempt to calculate BMI for children.