A4 paper is precisely 210x297mm (according to the standard), so the aspect ratio... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		DominikPeters on Sept 5, 2022 \| parent \| context \| favorite \| on: Why A4? – The Mathematical Beauty of Paper Size A4 paper is precisely 210x297mm (according to the standard), so the aspect ratio deviates from 1:sqrt(2) a little. Following that aspect ratio, the size would be 210x296.985..mm, so the rounding is really very slight.

jwilk on Sept 5, 2022 [–]

How exactly is it defined in the standard? Is there a formula? Or just a list of sizes for A0, A1, etc.?

I wanted to read the standard myself, but CHF 58 is a bit too much:

https://www.iso.org/standard/36631.html

DominikPeters on Sept 5, 2022 | | [–]

This seems to be a sample containing the relevant parts. https://cdn.standards.iteh.ai/samples/36631/c0883203ea25445c...

justsomehnguy on Sept 5, 2022 | | [–]

   y : x = √2 : 1 = 1,414

http://www.ikserang.com/qa/ISO_PAPER_BOARD/standards/en/iso_...

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact