The Programmer mode allows the user to perform operations related to computer programming, and finally, the graphing mode allows users to graph equations on a coordinate plane. The Scientific mode takes the calculator next level, it adds exponents and trigonometric functions. The Standard mode includes a num pad and buttons for performing arithmetic operations. Based on the modes you choose the app will change its appearance and functionality. Basically, the Calculator app has for modes, Standard, Scientific, Programmer, and a graphing mode. Calculator App is the most useful app and widely being used by Windows Users, for some users, this application is very needy, and they will launch and use this application multiple times during their work. Calculator App is a well-known app in the Windows Operating system, it is included in almost all versions of Windows.