Unlike the dollar sign or the percentage symbol, the radical symbol doesn't have its own dedicated key. But don't worry—there are several simple ways to type it, regardless of whether you are using Windows, Mac, or a smartphone.
Here is the ultimate guide on how to type the square root symbol on Windows, Mac, mobile devices, and within popular apps like Word and Excel. 1. Windows: Using Alt Codes how to type square root on keyboard
Note: This generally does not work with the number row at the top of the keyboard; you must use the numeric keypad. Unlike the dollar sign or the percentage symbol,
Windows offers three distinct ways to type the square root symbol, ranging from simple shortcuts to built-in tools. Press and hold the Alt key, then type
Press and hold the Alt key, then type 251 on your numeric keypad.