ICal is the Mac OS built-in calendar program. Like other built-in Mac applications, it's easy to use and integrates well with other Mac programs. Unfortunately, iCal can't easily be customized, which includes font sizes: You're stuck with the extremely small font size. However, one workaround allows you to make the text bigger, at least temporarily: the Mac's built-in "Zoom" feature. You can also print the calendar pages at a larger size through the Print dialog.
Using a TrackpadOpen iCal.
Press and hold the "Control" key on your keyboard.
Place two fingers on the trackpad and move them up to zoom in on iCal. Move your fingers down to zoom out.
Using the KeyboardOpen iCal.
Press the "Command" key and "+" keys to zoom in on iCal. Press "Command" and "-" to zoom out.
Select "Apple," "System Preferences" and "Universal Access" to open the Universal Access Control, which lets you control the degree that your keyboard controls will zoom in on the image.
Click "Options" under the Zoom section to open the Options dialog.
Drag the "Maximum Zoom" slider farther to the right to zoom in more tightly.
Click "Done" when finished to close the dialog.
Click the red button in the upper left corner of the dialog to close the Universal Access control.
Printing the Calendar With Larger TextOpen iCal.
Select "File," "Print" from the main menu to open the Print dialog box.
Select "Medium" or "Big" from the "Text Size" field to increase the text size on a printed calendar.
Click "Continue" to print the calendar.