BMI Calculator (Imperial)
Calculate Body Mass Index using pounds, feet and inches.
Results
If you measure your weight in pounds and height in feet and inches, this BMI calculator is built for you. The imperial BMI formula multiplies your weight in pounds by 703, then divides by height in inches squared. It gives the same result as the metric formula - just with the units you already know.
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Frequently asked questions
Multiply your weight in pounds by 703, then divide by your height in inches squared. For example, 154 lb at 5'9" (69 inches): 154 x 703 / (69 x 69) = 22.7.
The number 703 is a conversion factor that adjusts the formula from metric (kg and meters) to imperial (pounds and inches). It accounts for the unit differences.
For a BMI of 18.5-24.9 at 5'9", healthy weight ranges from about 125 to 168 pounds. Individual factors like muscle mass and frame size matter too.
The BMI formula is the same for everyone. However, women naturally carry more body fat than men at the same BMI. Some experts suggest using different category thresholds by sex.
Children use BMI-for-age percentile charts rather than the standard adult categories. A pediatrician should interpret BMI for anyone under 20.