We have taken into consideration that you may not want to go to the expense of having your prints professionally framed (although they do look great when they are!) so have kept to standard sizes -
A4 Prints - 21cm x 29.7cm will fit 'off the shelf' A4 frames
A3 Prints - 29.7cm x 42cm will fit 'off the shelf' A3 frames, but check frame measurement first
50cm x 70cm Prints - 52cm x 72cm which includes a 2cm white border which can be altered if necessary to fit an 'off the shelf' frame
Calendars - These are A4 when folded, so easy to pop in the post as a pressie. Double A4 when opened and hanging.