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Re:Ask YC: Feedback please - Actual size visualization webapp. by alexkay on Monday September 22, 2008 @07:49PM (#311787)
Monitors with the same diagonal can have vastly different DPI resolution.

Other than that, a very nice website.

Re:Ask YC: Feedback please - Actual size visualization webapp. by ptm on Monday September 22, 2008 @10:49PM (#311962)
Of course, it does take into account both physical size (inch) and screen resolution (pixels) to calculate DPI.