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Standard Envelope Sizes

You may already be familiar with common paper sizes like A4 or A3 and accustomed to the idea that the lower the number, the bigger the size. E.g. A3 is bigger than an A4 piece of paper.

Envelope sizing has been defined similarly, but the key difference is that paper sizes start with an “A” and envelope sizes start with “C” except for “DL”. (DL envelope stands for dimension lengthwise)

It can be confusing trying to work out what size you need so we created the guide below to help you understand.

C6 Envelope Size Guide

C6 ENVELOPE SIZE

114 x 162 mm - Takes A4 paper folded in half twice BROWSE C6 ENVELOPE SIZES
DL Envelope Size Guide

DL ENVELOPE SIZE

110 x 220 mm - Takes A4 paper folded in three, width ways BROWSE DL ENVELOPES
DL+ Envelope Size Guide
C5 Envelope Size Guide

C5 ENVELOPE SIZE

162x229mm - Takes A4 paper folded in half BROWSE C5 ENVELOPE SIZES
C+ Envelope Size Guide

C5+ ENVELOPE SIZE

162x235mm Oversize - ideals for envelope inserters BROWSE C5+ ENVELOPE SIZES
C4 Envelope Size Guide

C4 ENVELOPE SIZE

229x324mm - Takes A4 paper unfolded BROWSE C4 ENVELOPE SIZES
C7 Envelope Size Guide

C7 ENVELOPE SIZE

82x113mm - Takes A5 paper folded four times BROWSE C7 ENVELOPE SIZES


Envelope Size Chart