BMI is calculated as weight in kilograms divided by height squared. Which formula matches this definition?

• A. Weight (kg) / height^2 (m)
• B. Height (m) / weight (kg)
• C. Weight (lb) / height (in)^2
• D. Weight (kg) * height (m)

Answer: (A)

BMI measures how heavy someone is relative to their height, so weight goes in the numerator and height in the denominator, with height squared. Using kilograms for weight and meters for height gives the standard units of kg/m^2 and makes the measure consistent across people. This is why the correct expression is weight in kilograms divided by height in meters squared. The other forms either swap weight and height, use different units without proper conversion, or multiply rather than divide, which would not reflect BMI.