If printing yourself at home, the Print menu in your photo editor normally does use the file's scaled image dpi number (pixels per inch) to size the images on paper (regardless if it matches the paper size at all). But if the provided image shape does not match the paper shape, the excess image outside the paper edges simply disappears, results may not be what you expected. Or, if too small (insufficient pixels provided), the print quality will be lower, and the lab may refuse worst cases. 
That's not necessarily a problem, except a far too-large image will be slow to upload. If your image dimensions are too large, the photo shop will first resample it to this smaller requested size. Planning ahead to avoid surprises by first cropping the image to match that paper shape, and also to provide enough pixels so that the result will be 250 to 300 pixels per inch will be a very good plan.
If you order 8x10 inches, you will get 8x10 print size. They will ignore your dpi number already in the image file, and will recompute their own necessary "pixels per inch" value, to scale your image to their paper size.
The photo printing shops where we order prints will offer a paper size, and will fill that paper with your image. There are two situations when printing images, depending on if print shops or home printing. The dpi calculator is below, but first, some background concerns.
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