Calculator

Calculator is an application for mathematical operations that is included with Windows 1.0 and up. In Windows 3.0, the program was completely re-written, adding a Scientific mode allowing for more complex operations such as sin or log. In Windows 7, the Calculator app got redesigned and the program received features like History, Programmer Mode, Statistics Mode, Date Calculation and Unit Conversion. In Windows 8.1, a Metro-based version was introduced. The UWP version of Calculator was made open-source in 2019 and its source code was made available on GitHub.