- 1). Calculate your height in inches by multiplying the number of feet tall you are by 12. For example, if you measure 5 feet, 10 inches tall, you would multiply 5 by 12 to get 60 and add 10 to get 70 inches.
- 2). Square your height in inches. In this example, you would square 70 to get 4,900.
- 3). Divide your weight in pounds by 4,900. For example, if you weigh 170 pounds, you would divide 170 by 4,900 to get 0.034693878.
- 4). Multiply the result from Step 3 by 703 to find your BMI. Finishing the example, you would multiply 0.034693878 by 703 to find your BMI to be at 24.4.
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