What Are the Dimensions of A3 and A4 Paper Sizes?

Learn the exact sizes of A3 and A4 paper and how A3 relates to A4. Understand paper dimensions for printing and folding.

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A3 paper measures 297 x 420 mm (11.7 x 16.5 inches), while A4 paper measures 210 x 297 mm (8.3 x 11.7 inches). In terms of area, A3 is twice the size of A4. If you fold an A3 sheet in half, you get two A4 sheets.

FAQs & Answers

  1. What is the size difference between A3 and A4 paper? A3 paper measures 297 x 420 mm, which is exactly twice the area of A4 paper measuring 210 x 297 mm. Folding an A3 sheet in half produces two A4 sheets.
  2. How do you convert A3 paper to A4 size? You can convert an A3 sheet to A4 by folding it in half along the longer side, resulting in two A4-sized sheets.
  3. Why is A3 paper exactly twice the size of A4? The ISO A-series paper sizes are designed so that each size is half or double the area of the next, allowing easy scaling and folding. A3 is double the area of A4 for this reason.

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