Calculator software with easy-to-use interface, various changeable beautiful skin, and paper tape feature (commercial version). You can download new skins from our Web site http://www.9calculator.com. Our objective is to make the most common and easy-to-use and real-calculator-like desktop calculator.

Free calculator for Windows with an editable "tape" instead of one-line screen, which makes everyday calculations very convenient. Performs plus, minus, multiply, divide, square root, and percent calculations. Implies no limitations on precision and provides controllable rounding-up. Remembers everything forever and allows one to browse through full calculation history as if it were a text and reuse numbers or correct any misprints at any moment.