In Word, you can select one of several units of measurement for the ruler. You may be working on a document for someone who measures their margins, tabs, etc. in a different set of units than you usually use. It’s easy to change.

Click the "File" tab.

01_clicking_the_file_tab

Click "Options" in the menu list on the left.

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The Word Options dialog box displays. Click "Advanced" in the menu list on the left side of the dialog box.

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Scroll down to the Display section. Select an option from the "Show measurements in units of" drop-down list.

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The units of measurement on the ruler changes to your selection.

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If your ruler is not displaying, click the "View" tab and check the "Ruler" box in the Show group.

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You can easily access the Word Options dialog box again and change the ruler to use different units as needed.