Our Envelope Size Guide

Envelopes are an office staple and are essential for sending out important documents, and mailing out correspondence even in our digital world.

There are a huge range of envelopes depending on your needs, but the following essential guide can help you pick the right size. Please note that these are just some of the most common envelope sizes as there are plenty more. 

Most common envelope sizes:

Size    Millimetres    Inches

C3    457 x 324mm   18 x 12.75 inches
C4    324 x 229mm   12.75 x 9 inches
C5    229 x 162mm    9 x 6.4 inches
C6    162 x 114mm    6.4 x 4.5 inches
DL    220 x 110mm   8.7 x 4.3 inches

If you navigate to office supplies, and then envelopes on our main menu just below the search bar, you’ll be able to browse by specific envelope size, making your search far easier.

We also have categories for padded envelopes, coloured envelopes and so much more. However, if you are unsure or need some advice, please reach out to our team on the phone or via email who will be more than happy to assist your search for the perfect envelopes.