- How to open (keyboard): Press
Win + Rto open Run, typecalc, then pressEnter. Windows launches the Calculator app. - Function: Offers more than just basic arithmetic. Clicking the menu allows you to switch to "Scientific Calculator," "Programmer Mode," and useful tools like "Currency Converter" and "Unit Converter."
The built-in Calculator app: open the menu (☰) to switch modes. The screenshot shows Scientific mode with advanced keys, memory buttons, and History / Memory on the side.