Select the cells whose font and font size you want to change, or click the All Cells button (to the left of column A and above row 1) to format all the cells in the worksheet.
Click the Font field down arrow on the Standard toolbar, scroll through the available fonts, and select the font name.
Click the Font Size field down arrow and scroll through the available sizes. Select the size or type it into the Font Size field.
The font and font size you selected are applied.
INTRODUCTION
One way to format data in your worksheet is to change the font used to display it. Changing the font gives data a different look and feel, which can help differentiate the type of data a cell contains. You can also change the font's size for added emphasis.
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Viewing Font Samples
Office enables you to see a sample of each font in the Font drop-down list box, which means you know what the font looks like before you apply it to your cells. This helps you choose the right font more quickly.
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Formatting Options
To format only a portion of a cell's data, select only that portion and then change the font. You can also select a font (or other options) before you begin typing. Then all the data in a cell will be that font.