What is the wedding invitation size in cm and mm?

If you are ordering invitations or making your own, it helps to know the sizes in both centimetres and millimetres. The most common UK size, DL, measures 21 cm by 9.9 cm, which is 210 mm by 99 mm. That fits a DL envelope, which is 22 cm by 11 cm. A6 is another popular choice, measuring 14.8 cm by 10.5 cm, or 148 mm by 105 mm. That fits a C6 envelope, which is 16.2 cm by 11.4 cm. A5 is larger, at 21 cm by 14.8 cm, or 210 mm by 148 mm, and fits a C5 envelope. If you want a square invitation, a common size is 15 cm by 15 cm, or 150 mm by 150 mm, but you will need a square envelope. When you design your invitation, leave a margin of at least 5 mm from the edge so nothing gets cut off. Always check your printer's settings, because some home printers cannot handle very thick card. If you are unsure, ask your print shop for a sample before you order the full batch.