The A3 is paper size of 297 mm by 420 mm. On this page, we answer the following question: What is A3 size?
A0 relative to A3
An A0 has a surface area of 1 m². The length to width ratio of an A0 and all sizes of the A-series are √2:1. The area of an A3 is ½ × ½ × ½ = 1/8 m².
A3 paper size international
A3 size is an international paper size from the DIN quotation (DIN 476 from 1922). This standard has been changed to the ISO 216 standard. In parts of Germany people still speak of DIN A3. An A3 is part of the series A0, A1, A2, A3, A3, A5, A6, A7 and A8.
Weight and mass
A commonly used weight for A0 paper is 80 grams. The 80 grams is for a paper of A0 size. A whole sheet of A0 paper is 80 grams. An A0 paper is 80/8 = 10 grams.
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