The Pro-Rate Calculator can be used to quickly calculate payments for partial billing periods. For example, you might want to calculate the payment needed to cover dues from today until the end of the month.
Select Pro-Rate Calculator from the Utilities menu.
Enter the Begin Date and End Date for the time to be billed.
Enter the Renewal Amount, which is the standard amount due for a full billing period (e.g. the monthly or annual payment).
Enter the Renewal Period, which is the standard billing period length (e.g. 1-month or 6-months).
Click Calculate.