A US letter-size piece of paper is 8.5 inches wide by 11 inches long. Most businesses and organizations in the United States use US letter-size paper for their printing and copying needs. By default, Microsoft Word uses US letter-size paper, but if you're using the program on another computer or you accidentally change the setting, you can easily reset it to US letter-size in the Page Layout section.
Launch Microsoft Word and open your document.
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Click the "Page Layout" tab on the toolbar at the top of the window.
Click "Size" in "Page Setup." Select "8.5 x 11 Letter."