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 13×19“
• A2+ format 432 x 635mm or 17×25”

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%
  

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

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

approximately otherwise →