Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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

share|improve this question
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

1 Answer 1

up vote 7 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.
share|improve this answer
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.