Word Not Displaying Math Equations? Here's Why

Updated 09/02/2026

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.