Okay, get out your calculators.
When buying consider not only the DPI (dots per inch), but also the size of the sheet. A 300 DPI sheet is great, but consider that on a 5x7 sheet that, that is the optimum size for those images. Double the size to 10 x 14. Those images are now 150 DPI. At that rate things are going to look a bit ratty at 20 x 28.
The 300 DPI is a common standard for printing. So you will have to divide the size of your print by 300. Elements always has the amount of pixels at the top of the new page box. Play around with the DPI and watch the pixel count automatically change. They are also located at the bottom left of your screen.
To print a 5 x 7 at 300 DPI
1500 px divided by 300 = 5'
2100 px divided by 300 = 7"
Hoped that helped.
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