Which measurements are needed to calculate the body mass index (BMI)?

Which measurements are needed to calculate the body mass index (BMI)?

• A. Height and waist circumference
• B. Height, weight, and waist circumference
• C. Weight and waist circumference
• D. Height and weight

Answer: (D)

BMI is calculated using height and weight because it expresses body mass relative to stature. The formula is weight in kilograms divided by the square of height in meters, so you need two measurements: height and weight. Waist circumference isn’t part of the calculation; it measures abdominal fat and helps assess cardiometabolic risk, but it doesn’t affect the BMI value. In practice, you may use waist measurements alongside BMI for a fuller assessment, but the BMI itself relies solely on height and weight.

BMI is calculated using height and weight because it expresses body mass relative to stature. The formula is weight in kilograms divided by the square of height in meters, so you need two measurements: height and weight. Waist circumference isn’t part of the calculation; it measures abdominal fat and helps assess cardiometabolic risk, but it doesn’t affect the BMI value. In practice, you may use waist measurements alongside BMI for a fuller assessment, but the BMI itself relies solely on height and weight.