In the papermaking industry there are many different sizes of paper sheets available. Examples of standard sizes of paper sheets are A4, A5, A3, A2, A1, A0. Listed below are standard sizes of envelopes:

F o r m a t

C6 - (114 x 162 mm)

DL - (110 x 220 mm)

C5 - (162 x 229 mm)

B5 - (176 x 250 mm)

C4 - (229 x 324 mm)

B4 - (250 x 353 mm)

E4 - (280 x 400 mm)