Change the default font in excel for mac

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.

1. On the Excel menu, click Preferences.

2. Under Authoring, click General.

3. In the Default font and Font size boxes, select a new font and font size.

4. Click OK.

   Note: This won't change the font for an existing workbook.

5. Close and restart Excel.

   The new default font is applied when you create a new blank worksheet or workbook.