Inserting the square root symbol (√) into a document, spreadsheet, or text message is a frequent requirement for students, educators, and technical professionals. While it is one of the most common mathematical notations, it does not have a dedicated key on standard QWERTY keyboards. Depending on the operating system or the specific software application being used, the method for generating this character varies significantly.

Below is a comprehensive guide covering every reliable method to type the square root sign across all major platforms and applications.

Quick Copy and Paste

For those who need the symbol immediately without memorizing shortcuts, the most efficient method is to copy it from here and paste it into the destination field:

Square Root Symbol: √ Cube Root Symbol: ∛ Fourth Root Symbol: ∜

To copy, highlight the symbol above and press Ctrl + C (Windows) or Command + C (Mac). To paste it, press Ctrl + V (Windows) or Command + V (Mac).

Typing the Square Root Symbol on Windows

Windows provides several ways to access special characters. The best method depends on whether the hardware includes a dedicated numeric keypad and which version of Windows is running.

Using Alt Codes with a Numeric Keypad

The Alt code method is a legacy system that remains highly reliable across most Windows applications, including Notepad, WordPad, and web browsers.

  1. Ensure Num Lock is turned on.
  2. Hold down the Alt key.
  3. Type the numbers 251 on the numeric keypad (located on the right side of the keyboard).
  4. Release the Alt key.

Technical Note: This shortcut relies on the original OEM code page 437. If the software environment uses a different encoding, this shortcut may occasionally produce a different character. Furthermore, this method generally requires a physical numeric keypad. Using the number keys at the top of the keyboard will not work.

Using the Windows Symbol Panel (Windows 10 and 11)

Modern versions of Windows include an integrated emoji and symbol picker that is extremely user-friendly.

  1. Place the cursor where the symbol is needed.
  2. Press the Windows Key + . (Period) or Windows Key + ; (Semicolon).
  3. Once the panel appears, click on the Symbols icon (the third icon from the top, represented by a small omega Ω sign).
  4. Scroll through the categories or select the Math symbols subsection.
  5. Click on the √ symbol to insert it.

This method is particularly effective because it allows for visual confirmation before insertion and provides access to related mathematical operators like the infinity sign (∞) or the integral sign (∫).

Using the Character Map

The Character Map is a built-in utility that displays every character available in any font installed on the system.

  1. Type Character Map into the Windows search bar and press Enter.
  2. Ensure the "Font" is set to a standard type like Arial or Segoe UI.
  3. Check the Advanced view box.
  4. In the "Search for" field at the bottom, type "square root" and click Search.
  5. Click the √ symbol, click Select, and then click Copy.
  6. Paste the symbol into the desired application.

Typing the Square Root Symbol on macOS

Apple’s macOS offers the most streamlined keyboard shortcuts for mathematical symbols, integrated directly into the standard keyboard layouts.

The Keyboard Shortcut

For users with the standard U.S. English keyboard layout, the square root sign is just two keystrokes away:

  1. Hold the Option key.
  2. Press the V key.

This generates the √ symbol instantly in almost any Mac application, including Pages, Numbers, and Safari.

Using the Character Viewer

If the keyboard layout is non-standard or if the shortcut is forgotten, the Character Viewer (Emoji & Symbols) is the best alternative.

  1. Go to the top menu bar and select Edit > Emoji & Symbols, or press Control + Command + Space.
  2. In the search bar at the top of the window, type "square root".
  3. Double-click the √ symbol to insert it at the current cursor position.

Note for Grapher users: In the macOS Grapher application, which is used for creating 2D and 3D graphs, the shortcut may require Shift + Option + V depending on the specific math-entry mode active at the time.

Inserting the Square Root Sign in Microsoft Word

Microsoft Word provides specialized tools for mathematical typesetting that go beyond simple character insertion.

The Alt + X Shortcut (Hex Code)

Word has a unique feature that allows users to convert Unicode hex codes into their corresponding characters.

  1. Type the code 221A (this is the Unicode hex value for the square root sign).
  2. Immediately press Alt + X.
  3. The text "221A" will transform into the √ symbol.

This is often the fastest method for touch-typists who do not want to lift their hands from the home row to use the mouse.

The Equation Editor (For Professional Layouts)

If a "vinculum" is required—the horizontal bar that extends over the numbers inside the root—the standard text symbol is insufficient. The Equation Editor must be used.

  1. Press Alt + = to open a new equation box.
  2. Type \sqrt and then press the Spacebar.
  3. A square root box with a placeholder will appear. Type the radicand (the number or expression) inside the box.
  4. Press Enter or click outside the box to finish.

This method ensures the radical scales correctly with the size of the expression and is essential for academic papers and technical reports.

Inserting the Square Root Sign in Microsoft Excel

In Excel, there is a crucial distinction between displaying the square root symbol as a label and using the square root function for calculations.

Using the UNICHAR Function

If the goal is to display the symbol based on a formula (for dynamic labels), the UNICHAR function can be used.

  1. Select a cell.
  2. Enter the formula =UNICHAR(8730).
  3. The cell will display the √ symbol (8730 is the decimal equivalent of the hex 221A).

The Insert Symbol Menu

For static text within a cell:

  1. Go to the Insert tab on the Ribbon.
  2. Click on Symbol at the far right.
  3. In the Symbol dialog box, set the "Subset" to Mathematical Operators.
  4. Find and select the √ sign, then click Insert.

Calculation vs. Display

It is important to remember that typing √16 in an Excel cell will not result in the number 4. To perform the mathematical operation, use the SQRT function: =SQRT(16) This will return the value 4 for use in further calculations.

How to Type the Square Root Symbol on Google Docs

Google Docs handles special characters through a dedicated search interface that even allows for freehand drawing.

  1. Go to the Insert menu and select Special characters.
  2. A pop-up window will appear.
  3. In the search bar on the right, type "square root".
  4. Alternatively, use the mouse to draw the shape of a square root in the large empty box. The system will recognize the shape and suggest the symbol.
  5. Click the √ symbol to add it to the document.

For complex math, Google Docs also features an Insert > Equation tool similar to Microsoft Word, where typing \sqrt followed by a space creates a radical with a vinculum.

Typing on Chromebook and Linux

Chromebooks and most Linux distributions (using the GNOME or KDE desktop environments) utilize a standardized Unicode entry system.

  1. Click into the text area where the symbol is needed.
  2. Press Ctrl + Shift + U. An underlined "u" will appear.
  3. Type 221a.
  4. Press Enter.

The underlined "u221a" will be replaced by the square root symbol. This method is universal across most modern Linux applications.

Mobile Devices: iPhone, iPad, and Android

Mobile keyboards are optimized for speed and social communication, meaning mathematical operators are often hidden or absent.

The Text Replacement Trick (Recommended)

Since the square root sign is not on the standard iOS or Android keyboard, creating a shortcut is the most effective long-term solution.

For iPhone/iPad:

  1. Copy the √ symbol.
  2. Go to Settings > General > Keyboard > Text Replacement.
  3. Tap the + icon.
  4. Paste the √ symbol into the Phrase field.
  5. Type "sqrt" into the Shortcut field.
  6. Tap Save.
  7. Now, whenever you type "sqrt" followed by a space, it will automatically change to √.

For Android (Gboard):

  1. Copy the √ symbol.
  2. Go to Settings > System > Languages & input > Personal dictionary.
  3. Select your language.
  4. Tap the + icon.
  5. Paste the symbol into the top field.
  6. Type "sqrt" as the shortcut.

Using the Google Keyboard (Gboard) Math Mode

Some versions of Gboard allow you to find math symbols by tapping the ?123 button and then the =< button. However, availability varies by region and version, so the Text Replacement method remains the most reliable.

Square Root Symbol in Web Development and Coding

Web designers and programmers often need to represent the square root sign in code. Using the literal character can sometimes cause encoding issues, so entities are preferred.

HTML Entities

In HTML, use the following codes to ensure the symbol renders correctly across all browsers:

  • Named Entity: &radic;
  • Decimal Code: &#8730;
  • Hex Code: &#x221A;

CSS Content

To insert the symbol via CSS (for example, in a ::before pseudo-element):