In order to buy the correct picture frame for that print or photo you that have,  you will need to know what its size it is first.  And to know what size it is, you'll have to measure it even if these are in "inches" frame sizes instead of the more familiar, centimetres.  Thing is, if you're from Europe, schooled and grown up with centimetres and decimetres, you would always have measured everything in decimetres, centimetres or millimetres.  So when you go to buy and look for photo frames or picture frames, and you find a lot of them still labelled in Imperial sizes such as 8"x10" or 11"x14", chances are that you'll be a little confused.  After all Australia is supposed to be a metric country, right, so what's going on? ..