Abstract: An input and output display calculator for tracking medical devices used during surgery. Input buttons corresponding to the numbers and packages of needles and sponges allow the user to input this information into the calculator. Output provide for an up to date readout of the total number of such sponges/needles used during the procedure as well as a total of those that have not yet been accounted for. Input buttons on the display face of the calculator provide a means for the nurse or other personnel to input the number of needles/sponges used in increments corresponding to the number of such needles and sponges found in a typical package of such items. Subtraction buttons allow for such numbers to be removed from the display in the event of errors. A timer means records the time that such numbers are added and subtracted and a printer allows for a printed record of such to be made.