Envelope size guide
Known as the ISO C series, these are standard industry envelope sizes designed to accommodate standard ISO A size papers. This guide shows finished envelope sizes in millimeters.
C6 | 114 x 162 | Use with A6 (¼ A4) |
DL | 110 x 220 | Use with DL (1/3 A4) |
C5 | 162 x 229 | Use with A5 (½ A4) |
C4 | 229 x 324 | Use with A4 |
C3 | 324 x 458 | Use with A3 |