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Quick calculator · Paper Size Tools
Paper Diagonal Calculator
Calculate the diagonal length of a sheet. Use the result when preparing artwork, checking layout dimensions, or comparing standard and custom sheets.
Reviewed 2026-08-18Free · no account
Quick calculator
Enter your job values
Use the real values from your job. Optional fields can stay blank; zero should only be used when the value genuinely does not apply.
Answer
Your result will appear here
2 required values are still missing.
What the result is useful for
Paper Diagonal Calculator helps translate a physical sheet specification into digital artwork dimensions or comparable geometry without relying on a memorized pixel size that may assume the wrong resolution.
How the calculation works
Diagonal = √(width² + height²), using the Pythagorean theorem.
What this calculator cannot know
The result is deterministic from the values entered, but production constraints that are not represented by an input can change the practical decision.
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