A cash calculator or cash tally is a tool used to quickly and accurately count the amount of money in a cash drawer. It helps to ensure that the amount of cash on hand matches the amount that is recorded in the cash register or accounting system. The calculator typically has a number of buttons or keys for entering the denomination of each type of coin or bill, and displays the total amount of cash counted. The device is often used by businesses, especially those handling a large amount of cash transactions, to speed up the process of counting and reconciling cash at the end of the day or shift.