How to Type the Square Root Symbol on Your Keyboard and Phone

The square root symbol (√) is one of the most frequently used mathematical characters in academic, scientific, and financial documentation. Whether you are completing a math assignment in Microsoft Word, preparing a technical report in Google Docs, or quickly sending a formula via text message, knowing how to generate this symbol efficiently can save significant time.

For those looking for the quickest answer: on a Mac, press Option + V. On Windows, hold the Alt key and type 251 on the numeric keypad. In Microsoft Word, type 221A and press Alt + X.

This article provides a comprehensive guide to every reliable method for typing the square root sign across all major operating systems, devices, and software applications.

Quickest Methods to Type Square Root (√)

When you are in a hurry, these are the most direct ways to insert the symbol without digging through complex menus.

• Mac Shortcut: Option + V
• Windows Alt Code: Alt + 251 (using the Numpad)
• Microsoft Word: 221A followed by Alt + X
• Chromebook: Ctrl + Shift + U, then type 221A and press Enter
• Mobile Devices: Copy and paste the symbol: √

While these shortcuts are effective, their success often depends on your specific hardware configuration, such as whether your keyboard has a dedicated number pad or if the software supports Unicode conversion.

How to Type the Square Root Symbol on Windows

Windows offers several ways to input symbols, ranging from legacy Alt codes to modern UI elements like the Emoji and Symbol panel.

Using the Alt Code (Numeric Keypad Required)

The Alt code method is a classic Windows feature that relies on the Windows-1252 or OEM code pages.

1. Ensure that Num Lock is turned on.
2. Press and hold the Alt key on your keyboard.
3. While holding Alt, type the numbers 251 on the numeric keypad (located on the right side of the keyboard).
4. Release the Alt key. The symbol √ will appear.

Important Note for Laptop Users: If your laptop does not have a dedicated 10-key numeric pad, the standard Alt code usually will not work using the number row above the letters. Some laptops have a "Fn" (Function) key that activates a hidden numeric keypad on the letter keys (usually M, J, K, L, U, I, O); however, this is becoming rarer in modern designs.

Using the Windows Emoji and Symbol Panel

In Windows 10 and Windows 11, Microsoft introduced a unified symbol picker that is much more intuitive than memorizing codes.

1. Place your cursor where you want the square root sign.
2. Press the Windows Key + . (Period) or Windows Key + ; (Semicolon).
3. The Emoji panel will pop up. Click on the Symbols icon at the top (it looks like an omega sign Ω).
4. Scroll through the categories or click on the Math Symbols sub-category (usually represented by an infinity sign or mathematical operators).
5. Locate the √ symbol and click it to insert.

Using the Character Map

For older versions of Windows or when the Emoji panel fails to load, the Character Map is a reliable fallback.

1. Click the Start button and type "Character Map."
2. Open the application.
3. Check the Advanced view box to enable searching.
4. In the "Search for" field, type "square root" and hit Enter.
5. Click on the symbol, click Select, and then click Copy.
6. Paste it into your desired application using Ctrl + V.

How to Type the Square Root Symbol on Mac

Apple’s macOS is designed with built-in shortcuts for many mathematical and scientific symbols, making it significantly easier for users to type the square root sign without external tools.

The Standard Keyboard Shortcut

For almost every standard Mac keyboard layout, the shortcut is consistent:

1. Hold the Option key.
2. Press the V key.
3. The symbol √ appears immediately.

This works in virtually all macOS applications, including Pages, Numbers, Keynote, Safari, and Mail.

Using the Character Viewer

If you need variations of the symbol (such as the cube root ∛ or fourth root ∜), the Character Viewer is the best tool.

1. Press Command + Control + Spacebar.
2. The Character Viewer (Emoji & Symbols) window will open.
3. In the search bar at the top right, type "square root."
4. Double-click the √ symbol to insert it into your document.
5. Tip: You can add this symbol to your "Favorites" in the Character Viewer for even faster access in the future.

Typing Square Root in Microsoft Office Applications

Microsoft Word, Excel, and PowerPoint have unique behaviors when it comes to mathematical symbols. They offer professional "Equation" tools that go beyond the simple √ character.

How to Type Square Root in Microsoft Word

Word provides the most flexibility for typing math symbols. The most efficient method for power users is the Alt+X shortcut.

The Alt + X Unicode Shortcut

1. Type 221A in your document.
2. Immediately press Alt + X.
3. The text "221A" will instantly convert into the square root symbol √.

The Insert Symbol Menu

1. Navigate to the Insert tab on the Ribbon.
2. Click on Symbol (located on the far right).
3. Select More Symbols.
4. Change the "Subset" dropdown to Mathematical Operators.
5. Find and click the square root sign, then click Insert.

How to Use the Equation Editor for a "Proper" Radical

In professional mathematics, the square root symbol usually includes a "vinculum"—the horizontal bar that extends over the numbers (the radicand). The simple keyboard symbol √ does not do this. To get a professional-looking radical:

1. Press Alt + = to open the Equation box.
2. Type \sqrt and press the Spacebar.
3. A radical box will appear. Type your number inside the box, and the bar will automatically extend to cover it.
4. Alternatively, click on the Design tab (under Equation Tools) and select the Radical structures menu to choose between square roots, cube roots, or roots with a specific index.

How to Insert Square Root in Microsoft Excel

Excel users often confuse displaying a symbol with calculating a value.

• To Display the Symbol: Use the Alt + 251 method or the Insert > Symbol menu. You can also use the formula =UNICHAR(8730) to generate the symbol in a cell.
• To Calculate a Square Root: Do not use the symbol. Use the SQRT function. For example, =SQRT(64) will return the value 8.

How to Type Square Root in Google Docs and Google Sheets

Google’s productivity suite does not support Windows Alt codes directly, so you must use their internal menus.

Inserting Special Characters in Google Docs

1. Go to the Insert menu.
2. Select Special characters.
3. In the search bar, type "square root."
4. Click the symbol to add it to your page.
5. Bonus Feature: You can also draw the symbol with your mouse in the provided drawing box, and Google will recognize it and suggest the character.

Using the Equation Tool in Google Docs

For a proper mathematical radical with the overhead bar:

1. Go to Insert > Equation.
2. A new toolbar will appear. Click the button with the math symbols (usually the one with a square root icon).
3. Select the square root template.
4. Type your digits; the horizontal bar will expand as you type.

How to Get the Square Root Symbol on iPhone and Android

Mobile keyboards generally do not include the square root symbol on the primary or secondary layout.

Method 1: Copy and Paste

The fastest way for a one-time use is to copy the symbol √ from a website or this article and paste it into your message.

Method 2: Creating a Text Replacement (iOS)

If you use the symbol frequently, you can create a shortcut:

1. Go to Settings > General > Keyboard > Text Replacement.
2. Tap the + icon.
3. In the "Phrase" field, paste the symbol √.
4. In the "Shortcut" field, type sqrt.
5. Now, whenever you type "sqrt" on your iPhone, it will suggest replacing it with √.

Method 3: Android Personal Dictionary

1. Go to Settings > Languages & input > Personal dictionary.
2. Select your language and tap +.
3. Type the symbol √ in the first field and a shortcut like "sqrt" in the second.

Square Root for Web Developers: HTML and Unicode

If you are building a website or writing code, you should use standardized entities to ensure the symbol renders correctly across all browsers.

HTML Entities

• Decimal Entity: √
• Hexadecimal Entity: √
• Named Entity: √

CSS and JavaScript

• CSS: Use content: "\221A";
• JavaScript: Use \u221A within a string.

LaTeX

In LaTeX, the standard for scientific publishing, use the command: \sqrt{x} This will render a perfectly formatted radical with a vinculum.

Troubleshooting Common Issues

Why does my Alt code not work?

The most common reason is the lack of a numeric keypad. Most "top row" numbers do not trigger Alt codes. Additionally, ensure Num Lock is active. In some applications like Slack or certain web browsers, Alt codes may be overridden by the app's own keyboard shortcuts.

Why is the symbol showing up as a box?

If you see a box (□) or a question mark instead of the symbol, it means the font you are using does not support that specific Unicode character. Switch to a standard font like Arial, Times New Roman, or Calibri, which all have extensive support for mathematical symbols.

Is the square root symbol the same as a checkmark?

No. While they look similar, the square root sign (√, Unicode U+221A) and the checkmark (✓, Unicode U+2713) are distinct characters. Using a checkmark in a mathematical context is considered incorrect and may lead to confusion in automated grading systems or data analysis software.

Summary of Square Root Shortcuts

To ensure you have the right tool for the job, refer to this summary table for quick reference.

Frequently Asked Questions

What is the Unicode for the square root symbol?

The Unicode point for the square root symbol is U+221A. In hexadecimal, it is 221A, and in decimal, it is 8730.

How do I type the cube root (∛) or fourth root (∜) symbols?

On Windows, you can use the Character Map or type 221B (cube root) or 221C (fourth root) followed by Alt + X in Microsoft Word. On Mac, use the Character Viewer (Cmd + Ctrl + Space) and search for "cube root."

How do I make the square root bar go over the entire number?

To get the horizontal bar (vinculum), you must use an Equation Editor rather than just a text symbol. In Word, press Alt + = and use the \sqrt command. In Google Docs, use Insert > Equation. Simple text characters like √ cannot automatically stretch over other numbers.

Does the square root symbol work in Excel formulas?

The symbol √ is for visual display only. If you want Excel to perform a mathematical calculation, you must use the SQRT() function or raise the number to the power of 0.5 (e.g., =A1^0.5).

Can I type the square root symbol on a Chromebook?

Yes. Chromebooks use Unicode input. Press Ctrl + Shift + U, type 221A, and press Enter. This will generate the √ symbol in most text fields.

Conclusion

Typing the square root symbol is a straightforward process once you know the specific shortcuts for your device. For Mac users, Option + V is the most efficient route, while Windows users can rely on Alt + 251 or the Windows + Period menu. When professional formatting is required, such as in a thesis or a formal report, using the Equation Editor in Word or Google Docs is the best practice to ensure the radical bar correctly covers the radicand. By mastering these shortcuts and tools, you can ensure your mathematical and technical documents are both accurate and professionally presented.