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How do I type the square root symbol (√) in Windows?

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As a side note- that symbol, and the Alt-code to enter it have nothing to do with ASCII. ASCII only defines 128 symbols. – Michael Kohne May 2 '14 at 15:14

3 Answers 3

up vote 8 down vote accepted

In short it's ALT + 251 (note, no preceding zero)

Unicode it is U-221A

If that doesn't work then:

Press and hold down the Alt key.
Press the + (plus) key on the numeric keypad.
Type the hexidecimal unicode value (221A).
Release the Alt key.
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I am getting û for Alt 251 – ajy Oct 12 '11 at 2:04
alt-251 is font dependent, so use the unicode sequence alt+221a as above - this will only work in unicode aware apps. Note you can use charmap in most versions of Windows to work out either the alt sequence or alt-unicode sequence. – Paul Oct 12 '11 at 2:31
doesn't work. I am using an apple keyboard on a windows machine. Could that be a problem? – ajy Oct 12 '11 at 4:08
I am afraid it doesn't work for me – Jess Stone Jul 14 '14 at 15:24
I am getting ¹ for Alt+251 – sergiol May 19 at 7:33

Alt 251 didn't work for me, nor did alt +... but alt 8730 did (0x221A in decimal), i.e. hold alt, type 8730 on the numeric pad, release alt.

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→, doesn't work. – redbeam_ May 12 at 18:45

I used charmap and seeked to the position where the character U+221A is, clicked the buttons Select and Copy, then I pasted it where I wanted to use it.

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