I have taken pictures and am sending them into the printers to get them blown up. I am starting with a 4 by 6 photo. And I want to a variety of sizes that are up to two feet on one side. I just cannot figure out all the sizes in between to get there. I don't want the photos to be stretched, but retain original proportions. Is there a formula I can use or anything? Basically what are the 6 or so sizes that get me up to 24 " on one side. Thanks.


The ratio of 4 x 6 is 1.5.

So if you know what the short side should be, just multiply it by 1.5 (or if you know the long side, divide by 1.5 to ascertain the short side).

Short side: 12
Long side: 18

Short side: 24
Long side: 36

And so on

  • 1
    Thanks so much. I couldn't get a solid multiplier because i know 5 x 7 is another standard photo size. It doesn't follow the multiply by 1.5 rule. Does that mean it's slightly distorted or do they just call it 5 x 7 but really it's 5 x 7.5? May 23 '16 at 15:45
  • I think 7x5 is standard and that ratio is 1.4. I think alot of labs offer 6 x 4.5 which is closer. but admittedly as these ratios differ it would mean cropping the image at one particular print size. I used to be very anal retentive about that sort of stuff, wanting what was composed in the viewfinder to be printed, and there are different paper sizes, but then I learnt about all the different negative sizes, 6x4.5, 6x6, 6x7, 6x9 and then 4x5 inch and many many more. Arrrrgghhh
    – lharby
    May 23 '16 at 16:03
  • Oh wow, so its hard to say what the negative size is to know what the view finder would be actually seeing to know what ratio makes the picture true to size? May 24 '16 at 18:41

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