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Basic guide for paper sheets and envelope sizes

Paper 'A' sizes – general printing, stationary, posters, etc. Paper 'B' sizes – posters, wall charts, etc.
Format Size
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 149 x 210 mm
Format Size
B0 1000 x 1414 mm
B1 707 x 1000 mm
B2 500 x 707 mm
B3 354 x 500 mm
B4 250 x 354 mm
B5 177 x 250 mm

Paper "RA" sizes – used when additional space is needed for trimming after printing. Paper "SRA" sizes – is slightly larger than "A" size to allow for bleed or extra trimming.
Format Size
RA0 860 x 1220 mm
RA1 610 x 860 mm
RA2 430 x 610 mm
Format Size
SRA0 900 x 1280 mm
SRA1 640 x 900 mm
SRA2 450 x 640 mm

Envelope sizes:

Format Size
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
C7 81 x 114 mm
C8 57 x 81 mm
DL 110 x 220 mm
C7/6 81 x 162 mm