Word Not Displaying Math Equations? Here's Why

The file looks fine on your machine, but the equations turn into empty boxes, garbled text, or blank space when someone else opens it. Here are the 3 most common causes, ranked by how often they happen.

1. The Cambria Math font is missing on the machine opening it

Word's Equation feature uses a dedicated math symbol font called Cambria Math, bundled with Word since the 2007 version on most Windows machines. If the file is opened with something other than real Word (some free document viewers, for example) or on a machine missing that font, the equation can show misplaced characters or empty boxes.

How to check: open the file in actual Microsoft Word (not another viewer app). If the equation displays correctly there, the problem is the viewer, not a broken file.

2. The file is saved in the old .doc format (Word 97-2003)

The old .doc format doesn't fully support the modern Equation Editor (OMML) that current Word versions use. An equation created with the modern editor can turn into a static image or lose its formatting entirely when saved down to .doc.

Fix: Save As the file in .docx format instead of .doc, then check whether the equation displays correctly.

3. It's a MathType equation, but MathType isn't installed

A MathType equation is its own kind of embedded object, not a native Word Equation. If the machine opening the file doesn't have MathType installed (or a trial has expired), the equation might show as a static, non-editable image, or throw an “object not found” error when double-clicked.

How to check: double-click the equation. If Word says it can't find the editor, or opens an unfamiliar interface instead of the usual Equation Editor, it's likely a MathType equation and MathType isn't installed on that machine.

If none of these three is the cause

Try copying that equation into a brand-new Word file. If it still breaks the same way, the original file was probably saved incorrectly from the start (for example, the “equation” was actually just a pasted screenshot, never a real equation object to begin with). See the 4 different types of “equation in Word” for a quick way to tell them apart.