I have an image that is 2362 x 1671, I would to print the image and put it in a frame roughly A2 size. I don't want to crop it or ideally alter the ratio, what would be the best way of doing this? Thanks

But if my ratio isn't A2 it will either crop or stretch to fit. There's lot's of different frame sizes with different ratios how do I work out what size to get?

Divide the big number by the little number to get the aspect ratio: 1.4135 Then choose paper that is the same Luck for you the A sizing convention is 1.4142. Shouldn't make much difference, although you'd only be getting 71 pixels per inch if they could print the whole page

Reading your post, I realised that it's just the square root of 2 Just need to put √2 in the calculator and you'll have it in as many decimal places that you need.

That suddenly makes sense! Because A sizing is always two sheets together to make the next size up. Amazing.