Set the margin unit of measurement to inches, centimeters, millimeters, points, or picas.
Note: This change also affects the ruler and other measurements.
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Go to File > Options > Advanced.
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Scroll down to Display and select the unit you want in Show measurements in units of.
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Select OK.
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Go to Word > Preferences.
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Under Authoring and Proofing Tools, select General.
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Select the unit you want in Show measurements in units of.
