How to Convert BMI to Pounds


Body mass index, or BMI, is a rough measure of body weight that estimates whether your weight is healthy for an average person of your height. BMI is not a suitable measurement for children or very muscular athletes. For the rest of us, however, it's a useful tool that can help to identify and maintain the appropriate weight range for a given height.

Things You'll Need

  • Calculator
  • Measure the height, in inches, of the person whose BMI you want to convert to pounds. One foot is 12 inches, so a 5-foot-6-inch person would be (5 x 12) + 6 inches tall, or 66 inches.

  • Calculate weight from BMI using this formula:

    (BMI / 703) x (height in inches x height in inches) = weight in pounds

    As an example, if a person were 66 inches tall, and had a BMI of 27, his weight would be (27 / 703) x (66 x 66), which is 0.0384 x 4,356, or 167 pounds.

  • Check your results. Enter the height and weight into this formula to convert to BMI:

    weight in pounds / (height in inches x height in inches) x 703 = BMI

    The answer should be the BMI you started with. (Note that you may have to round the answer up or down to get a whole number.) If the BMI is different, there is an error in your calculations.

Tips & Warnings

  • BMI values represent points within categories that describe how close an individual is to the ideal height/weight ratio for adults. The World Health Organization defines eight categories, from severe thinness to obese class III.

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  • Photo Credit Body image by Snezana Skundric from
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