Default Font size

What is the default font size in Microsoft Excel?
How to change the default font size in Microsoft Excel?

The default font size in Microsoft Excel is 10 points (all Excel versions)
The minimum font size is 1 point and the maximum font size is 409 points.

Know more about font size here

To change the default font size,

• Go to TOOLS->OPTIONS
• Select the GENERAL tab
• Change the FONT SIZE in the SIZE box. (This would be located to the right of the Standard Font box.

To know how to change the default font,click here

Also see,
True type font
Install a font