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Office Settings & Configuration

How to Restore the Ctrl+Alt+= Formula Shortcut in Word

Elise WilliamsElise Williams Sep 30, 2026 870 views

Question details

The user needs to restore the functionality of the Ctrl+Alt+= shortcut used for opening the equation or formula tool in Microsoft Word.

How to Restore the Ctrl+Alt+= Formula Shortcut in Word
Product
Microsoft Word
Device & OS
not provided
Scenario
Editing a document in Word where the equation shortcut fails to trigger.
Observed behavior
The Ctrl+Alt+= shortcut for the equation tool stops working because the document is currently saved in Compatibility Mode.
Before you start

Ensure your keyboard is functioning properly and that no other background applications are overriding the Ctrl+Alt+= shortcut combination.

Solution 1Recommended

Convert the Document from Compatibility Mode

Update the document to the current Word format to restore advanced features like the equation editor shortcut.

When a document is saved in an older format (.doc) or Compatibility Mode, Microsoft Word disables certain modern features to maintain backward compatibility. This restricts the native equation editor and disables its associated keyboard shortcuts.

1
Open the Document

Launch Microsoft Word and open the specific document where the shortcut is not working.

2
Navigate to Info

Click on 'File' in the top-left corner of the ribbon menu, then select 'Info' from the left sidebar.

3
Convert Document

Click the 'Convert' button (usually located next to a Compatibility Mode warning) to update the file to the newest format.

4
Save and Test

Save the newly converted document. Press 'Ctrl+Alt+=' on your keyboard to verify that the formula shortcut is now working.

Convert the Document from Compatibility Mode
Format Updated: Converting the document will upgrade its format to .docx, re-enabling all modern Word features including the equation editor.
Free Microsoft Office alternative

Use WPS Writer for Seamless Equation Editing

If Microsoft Word compatibility issues disrupt your workflow, try WPS Office. It is a highly compatible, lightweight, and free alternative that supports modern document formats and complex mathematical equations without the hassle of restricted compatibility modes.

  1. 1. Download and Install: Download WPS Office for free from the official website and install it on your device.
  2. 2. Open Your Document: Launch WPS Writer and open your existing Word document.
  3. 3. Insert an Equation: Navigate to the 'Insert' tab and click on 'Equation' to easily build and format mathematical formulas.
Fully compatible with Microsoft Word .docx formatsBuilt-in intuitive Equation Editor for complex mathematical formulasLightweight design with fast loading speedsFamiliar user interface that requires no learning curve
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Frequently Asked Questions

Why does my document say Compatibility Mode in Word?

Compatibility Mode activates when you open a document created in an older version of Word (such as Word 97-2003). It temporarily disables newer features to prevent formatting issues for users on older software versions.

Can I customize the shortcut for inserting equations in Word?

Yes, you can customize shortcuts by navigating to File > Options > Customize Ribbon. Click the 'Customize' button next to Keyboard shortcuts, find the 'EquationInsert' command, and assign a new key combination.

Are formulas saved in Compatibility Mode visible to others?

If you used the modern equation editor before saving to an older format, the equations might be converted into uneditable images. This ensures they remain visible to users with older versions of Word, though they can no longer be modified.