A patient weighs 121 pounds. What is the patient's weight in kg?

To convert a patient's weight from pounds to kilograms, you can use the conversion factor where 1 pound is approximately equal to 0.453592 kilograms. The equation to convert pounds to kilograms can be expressed as:

Weight in kg = Weight in pounds × 0.453592

For a patient weighing 121 pounds, the calculation would be as follows:

Weight in kg = 121 × 0.453592 ≈ 54.884 kg

When rounded to the nearest whole number, this value approximates to 55 kg. This is why the correct answer is 55 kg.

This conversion is essential in pharmacy practice, especially when calculating dosages, as many medication dosages are often prescribed in kilograms rather than pounds. Understanding this conversion ensures proper medication management and patient safety.