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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.

4 x 6 Inches Envelope Size Guide

4 x 6" ENVELOPE SIZE

4 x 6 " - Takes A4 paper folded in half twice BROWSE 4 x 6 " ENVELOPE SIZES
4 x 8 Inches Envelope Size Guide

4 x 8" ENVELOPE SIZE

4 x 8" - Takes A4 paper folded in three, width ways BROWSE 4 x 8" ENVELOPES
6 x 9 Inches Envelope Size Guide

6 x 9" ENVELOPE SIZE

6 x 9" - Takes A4 paper folded in half BROWSE 6 x 9" ENVELOPE SIZES
9 x 12 Inches Envelope Size Guide

9 x 12" ENVELOPE SIZE

9 x 12" - Takes A4 paper unfolded BROWSE 9 x 12" ENVELOPE SIZES
 3 x 4 Inches Envelope Size Guide

3 x 4" ENVELOPE SIZE

3 x 4" - Takes A5 paper folded four times BROWSE 3 x 4" ENVELOPE SIZES


Envelope Size Guide

Envelope Name Millimeters Centimeters Inches
C3 Envelopes 324 x 458 mm 32.4 x 45.8 cm 12.75 x 18.03
C4 Envelopes 229 x 324 mm 22.9 x 32.4 cm 9.01 x 12.75
C5 Envelopes 162 x 229 mm 16.2 x 22.9 cm 6.37 x 9.01
C6 Envelopes 114 x 162 mm 11.4 x 16.2 cm 4.48 x 6.37
C7 Envelopes 83 x 112 mm 8.3 x 11.2 cm 3.26 x 4.40
DL Envelopes 110 x 220 mm 11 x 22 cm 4.33 x 8.66
A7 Envelopes 133 x 184 mm 13.3 x 18.4 cm 5.24 x 7.24
Gift Card Envelopes 95 x 122 mm 9.5 x 12.2 cm 3.74 x 4.8