What are the "A" paper sizes?

The "A" system of paper sizes is defined in International Standard ISO 216. The largest size, A0, was set so that its area is 1 square metre and all sizes have an aspect ratio of width to length of 1 to the square root of 2 (1.414). Therefore, if an A0 sheet is folded in half across its width, the resultant size is A1 and so on.

The table below summarises the sizes:

Sizelengthwidth
A01189841
A1841594
A2594420
A3420297
A4297210
A5210148
A6148105
A710574

Testimonials ( 4585 )
(5,0/5)

Review By Robert Marsh,
A half dozen recent purchases by me all flawlessly fulfilled by The Writing Desk . Other reviewers ...
13-02-2020
Verified Purchase
Review By David Griffiths,
Looking in my e-mails, I see that my earlier order with The Writing Desk was in August 2014, it now ...
09-02-2020
Verified Purchase
Review By Mark Brailsford,
I'm writing yet another review for the this wonderfull old fashioned pen shop as I'm just blown away ...
07-02-2020
Verified Purchase