Print calculators
The three sums that decide whether a file prints the size you meant. Free, no sign-up, and they run in this page — nothing is uploaded and nothing is stored.
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Bleed calculator
Finished size in, document size out — with the safe area and the pixels at 300 DPI.
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DPI calculator
Inches to pixels, pixels to inches, and whether what you have is big enough to print.
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Print layout calculator
How many fit a sheet, which way round, and a picture of it. The same code the app prints with.
Why these three
They are the three questions that come up between finishing a design and getting it onto paper, and the three that are most often answered wrong by half.
The layout calculator is worth singling out: it runs the same layout code BoboCreate prints with, exported from the app itself rather than written again here. If the app says two 5 × 7 invitations fit a Letter sheet, this page says it too, because it is the same function.
If you want the numbers for a size you already know, the printable size reference lists all of them worked out — finished size, bleed, safe area, pixels at 300 DPI and how many fit a sheet.