ISO Standard Sizes

ISO 216 is the international standard by which paper size is defined. It incorporates the A and B series of paper sizes, including the most commonly used paper size in the world today – A4. The underlying principle behind ISO 216 is that when folded in half parallel to its shorter side, any piece of paper conforming to the standard will retain its original aspect ratio of 1:2.

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A Series Paper Sizes
A4 Paper Size
US Letter Paper Size
Billboard Sizes
Newspaper Sizes
ISO Envelope Sizes
US Envelope Sizes
ANSI Paper Sizes
Business Card Sizes
Photo Sizes
Old Imperial Sizes
Canadian Paper Sizes
North American Architectural Sizes


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