How is BMI calculated using weight in pounds and height in inches?

The calculation of Body Mass Index (BMI) incorporates weight and height to provide a measure of body fatness. The correct approach for calculating BMI when using weight in pounds and height in inches involves multiplying the weight by 703 and then dividing by the square of the height in inches.

This formula is used because BMI is expressed in units that standardize the weight and height measurements, allowing for a meaningful evaluation of body weight relative to height. The factor of 703 adjusts the units for the BMI metric, which is traditionally expressed as weight in kilograms divided by height in meters squared. This adjustment is necessary to maintain the same scale when using pounds and inches, making it directly applicable in the United States where these units are commonly used.

In this formula, the squaring of height is essential because it reflects the relationship between weight and height in a way that accounts for proportional increases in body mass compared to height. Consequently, this calculation provides a reliable estimate of body fatness and is utilized widely in health assessments.