ISO 216 - Wikipedia, the free encyclopedia
A6 105 × 148 B6 125 × 176 A7 74 × 105 B7 88 × 125 A8 52 × 74 B8 62 × 88 A9 37 × 52 B9 44 × 62 A10 26 × 37 B10 31 × 44 ... For comparison, the letter paper size commonly used in North America (8.5 in × 11 in (216 mm × 279 mm)) is approximately 6 ......