correct cropping tech

I have this burning question but dont know how to ask it, so bare with me as I explain my problem.

Ok, lets say I snap a picture in portrait orientation of a person, but it has way too much sky so I want to crop it.

So I use my crop tool and cut some of the sky off. Now that picture is no longer the correct size for printing. So if I wanted to make an 8x10 of this I would have to also cut some of the sides off to make it the same height to width ratio as it was.

I hope I explain it correctly, so if I want to use some of a photo for print, is there an easy way to make sure it stays the correct size for printing??

What image editor are you using?

I suppose it depends on the image, but why not do the 8 X 10 crop first? Should be any need for a second.

I think this may be a variation of the "why can't I make one crop for any aspect ratio?" question that pops up from time to time. I just keep an uncropped version archived, and crop and save a copy based on the print size. Different aspect ratios (and their corrosponding print sizes) can have a profound impact on the overall composition. Going from 2:3 - standard 35mm and dslr aspect ratio - to 4:5 (8x10 print) can sometimes drastically change the overall look of an image. Some images may not be appropriate for a change in format, especially if cropping involves losing some critical part of the picture. There are print services that offer other, relatively large, print sizes. Mpix and EZPrint are just two that offer 8x12. It also isn't that difficult to find precut matting and frames for this size, as well.

Savone; if you're using Adobe Phoshop (I think any flavor) this should work:

Select the Crop tool; and you have spaces to put in your desired screen or print size.

Shown below is Landscape 8.5 X 11; if I wanted portrait; I'd hit the little double arrow between length and height to swap them.

Hitting the dropdown arrow on the crop tool gives you some presets as well:

Hopefully this is what you were after..

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The dropdown presets also contain ppi settings - which involve resampling - something you may or may not want to do. Cropping isn't quite as simple as it looks. Here are two excellent tutorials on the subject:
https://photography-on-the.net/forum/showthre​ad.php?t=34477
https://photography-on-the.net/forum/showthre​ad.php?t=34567