emily -

I'm curious more about whether many people have printers capable of handling A3 size than about the program to make calendars.

In the US, it's rather difficult to get the metric size papers, but many "consumer grade" printers will handle A4 and A5 sizes. Very few people here have printers capable of printing A3, as the machines to do it are somewhat more expensive and are considered "commercial" machines.

The question isn't whether it's useful to have an A3 layout, since I assume you can always take your file to a commercial print shop for printing. I'm simply curious whether larger format printers are more commonly available (and commonly used) in the metric consumer markets.

John