===ISO A SERIES (mm)====

| {{http://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/A_size_illustration.png/436px-A_size_illustration.png}} |  A0 | 841 x 1189 |
| ::: |  A1 | 594 x 841 |
| ::: |  A2 | 420 x 594 |
| ::: |  A3 | 297 x 420 |
| ::: |  A4 | 210 x 297 |
| ::: |  A5 | 148 x 210 |
| ::: |  A6 | 105 x 148 |
| ::: |  A7 | 74 x 105 |
| ::: |  A8 | 52 x 74 |
| ::: |  A9 | 37 x 52 |
| ::: |  A10 | 26 x 37 | 

  * Area of A0 = 1m^2
  * A0/A1 = A1/A2 = A2/A3 = A3/A4 ... A9/A10 = 2
  * Length = √2 * Width

non-ISO sizes
  * A3+ format (aka "Super B" or "Super A3") 330 x 482 mm  or 13x19"
  * A2+ format 432 x 635mm or 17x25"

reducing size for scaled printing

    From A1 to A2 = 71%
    A2 to A3 = 71%
    A3 to A4 = 71%
    A4 to A5 = 71%
    From A1 to A3 = 50%
    A2 to A4 = 50%
    A4 to A6 = 50%
    From A1 to A4 = 35%

increasing size for scaled printing

    From A2 to A1 = 141%
    A3 to A2 = 141%
    A4 to A3 = 141%
    A5 to A4 = 141%
    From A3 to A1 = 200%
    A4 to A2 = 200%
    From A4 to A1 = 283%
    From A5 to A1 = 400%
    
===ISO B SERIES (mm)====

| {{https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/B_size_illustration2.svg/439px-B_size_illustration2.svg.png}} [[https://en.wikipedia.org/wiki/Paper_size#/media/File:B_size_illustration2.svg|svg]] | B0 | 1000 x 1414 |
| ::: | B1 | 707 x 1000 |
| ::: | B2 | 500 x 707  |
| ::: | B3 | 353 x 500  |
| ::: | B4 | 250 x 353  |
| ::: | B5 | 176 x 250  |
| ::: | B6 | 125 x 176  |
| ::: | B7 | 88 x 125   |
| ::: | B8 | 62 x 88    |
| ::: | B9 | 44 x 62    |
| ::: | B10 | 31 x 44   |

The area of B series sheets is the geometric mean of successive A series sheets. B1 is between A0 and A1 in size, with an area of 0.707 m2 (​1⁄√2 m2). As a result, B0 is 1 metre wide, and other sizes of the series are a half, a quarter or further fractions of a metre wide.

  * B5 is a relatively common choice for books
  * B7 is equal to the passport size ID-3 from ISO/IEC 7810

====US (inches)====

{{https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Paper_size_-_US_system.svg/660px-Paper_size_-_US_system.svg.png}}

====Non-ISO=====

otherwise, from JIS to Double elephant via Duodecimo et Coquille -> https://en.wikipedia.org/wiki/Paper_size

approximately otherwise -> 

| {{https://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Comparison_paper_sizes.svg/773px-Comparison_paper_sizes.svg.png?350}} | {{https://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Comparison_newspaper_size.svg/600px-Comparison_newspaper_size.svg.png?550}} |