Standard ISO Paper Sizes

Different parts of the world use different standards for paper sheet sizes, but the most widely used system is the ISO standard. This consists of the A series (e.g. A4) and the C series for envelopes (e.g. C4 envelope for an A4 sheet). There is a B series of intermediate sizes for the A series but it is not so commonly used. RA and SRA (e.g. SRA4) sheets are used by printers and are slightly larger than the A series, providing extra grip and trim in the printing process.

SRA0 900 x 1280 mm
SRA1 640 x 900 mm
SRA2 450 x 640 mm

A0 841 x 1189 mm
A1 594 x 841 mm
A2 420 x 594 mm
A3 297 x 420 mm
A4 210 x 297 mm
A5 148 x 210 mm
A6 105 x 148 mm
A7 74 x 105 mm

B0 1000 x 1414 mm
B1 707 x 1000 mm
B2 500 x 707 mm
B3 353 x 500 mm
B4 250 x 353 mm
B5 176 x 250 mm

C0 917 x 1297 mm
C1 648 x 917 mm
C2 458 x 648 mm
C3 324 x 458 mm
C4 229 x 324 mm
C5 162 x 229 mm
C6 114 x 162 mm