‘C’ Paper Sizes.
Used for standard envelope sizes used in the UK, slightly larger than A size. For example, an A5 document will fit neatly inside the dimensions of a C5 envelope.
C7
81 x 144 mm
C6
114 x 162 mm
C5
162 x 229 mm
C4
229 x 324 mm
C3
324 x 458 mm
C2
458 x 648 mm
C1
648 x 917 mm
C0
917 x 1297 mm
