Paper Size Reference

Diagram

Introduction

1. Paper size memory method: By comparing the length and width data of paper sizes in the above figure, we can see the pattern of paper size changes. Thus, we can deduce that: A0 paper folded in half along the length becomes A1 paper; A1 paper folded in half becomes A2 paper; A2 paper folded in half becomes A3 paper, and A3 paper folded in half becomes A4 paper. A4 size paper is the most commonly used in our daily lives, and generally, if we remember that A4 is 210mm × 297mm, we can quickly deduce the dimensions of other paper sizes.
2. Paper pixels and resolution: Based on A4 paper dimensions of 210mm × 297mm, and 1 inch = 2.54cm, we can calculate the paper size in pixels at different resolutions. Here are the commonly used specifications:
   1. At 72 pixels/inch, A4 paper pixel dimensions are 842×595
   2. At 100 pixels/inch, A4 paper pixel dimensions are 1169×827
   3. At 120 pixels/inch, A4 paper pixel dimensions are 1403×992
   4. At 150 pixels/inch, A4 paper pixel dimensions are 1754×1240
   5. At 300 pixels/inch, A4 paper pixel dimensions are 3508×2479