The days' supply is calculated by which of the following formulas?

The days' supply is calculated by which of the following formulas?

• A. The daily usage is the total amount dispensed in a year divided by 365
• B. The daily usage is the total amount dispensed in a year divided by 12
• C. The daily usage is the total amount on hand divided by 365
• D. The daily usage is the total amount dispensed in a day divided by 1

Answer: (A)

Days' supply shows how many days current inventory will last given normal consumption. The best way to estimate this is to use the average daily usage. This is typically found by taking the total quantity dispensed in a year and dividing by 365, which yields the average units used per day. With that daily usage figure, you can divide the on-hand quantity by the daily usage to get the days' supply. Other approaches miss the core idea: one option uses a monthly divisor, which doesn’t reflect daily usage; another uses on-hand divided by 365, which measures stock size rather than how quickly it’s consumed; and another simply repeats a daily amount for one day, which doesn’t capture ongoing usage patterns.

Days' supply shows how many days current inventory will last given normal consumption. The best way to estimate this is to use the average daily usage. This is typically found by taking the total quantity dispensed in a year and dividing by 365, which yields the average units used per day. With that daily usage figure, you can divide the on-hand quantity by the daily usage to get the days' supply.

Other approaches miss the core idea: one option uses a monthly divisor, which doesn’t reflect daily usage; another uses on-hand divided by 365, which measures stock size rather than how quickly it’s consumed; and another simply repeats a daily amount for one day, which doesn’t capture ongoing usage patterns.