By default, Excel for Mac uses Body Font in font size 12, which is displayed as Calibri font in font size 12 when you type data in a worksheet, header or footer, or text box. However, you can change the default font and font size for all new workbooks that you create.
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On the Excel menu, click Preferences.
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Under Authoring, click General.
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In the Default font and Font size boxes, select a new font and font size.
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Click OK.
Note: This won’t change the font for an existing workbook.
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Close and restart Excel.
The new default font is applied when you create a new blank worksheet or workbook.