What is the Size Ratio of A4 Paper Compared to Letter Paper?

Learn the size difference and ratio between A4 and Letter paper, including exact measurements and how they compare by area.

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A4 paper measures 210 x 297 mm, while Letter paper is 216 x 279 mm. To compare, A4 is narrower and longer. The ratio of A4 to Letter size by area is approximately 1:1.02, with Letter paper being slightly larger.**

FAQs & Answers

  1. What are the exact dimensions of A4 and Letter paper sizes? A4 paper measures 210 x 297 mm, while Letter paper measures 216 x 279 mm.
  2. How much larger is Letter paper compared to A4 by area? Letter paper is approximately 2% larger than A4 by area, with a size ratio of about 1:1.02.
  3. Why do A4 and Letter paper sizes differ? A4 is an international standard (ISO 216), commonly used outside North America, while Letter is the standard paper size primarily used in the United States and Canada.
  4. Can A4 and Letter paper be used interchangeably in printers? While many printers support both sizes, the difference in dimensions may cause slight formatting or margin issues when using the wrong size.