Windows 8.1 includes two built-in calculator options, so you may not even need a separate download. You can access a traditional desktop version or a newer "Metro-style" app designed for touchscreens. Built-in Options in Windows 8.1
If the built-in versions don't meet your needs, several free alternatives are available through the Microsoft Store : Calculator X8 - Free download and install on Windows calculator for windows 8.1 free download
This is the familiar version from Windows 7. To open it, press the Windows Key + R , type calc , and hit Enter. You can pin it to your taskbar for quick access. Windows 8
If you are looking for the default tools already on your system: To open it, press the Windows Key +
A full-screen, touch-friendly version included in the Windows 8.1 update. It features three main tabs: Standard , Scientific , and Converter . You can find it by searching "Calculator" on the Start screen or looking in the "All Apps" list. Best Free Third-Party Downloads