1.Select the cell or range (see the diagram below)
2. Click on the Home tab
3. Click on the down arrow to the right side of the Font size command
A drop down list will appear offering several font sizes to choose from (up to size 72). The font size is measured in points, and 72 points represent an inch.
4. Click on the font size you want
MS Excel will apply the changes for you.
Tip: If you scroll the pointer of your mouse over the font sizes, Excel will give you a preview of how it would look in your Worksheet.
Lesson 29: How to apply Font effects