FAQs > Office Supplies - Envelopes Size and Style Guide

Envelopes come is a variety of shapes, sizes and specifications which can seem bewildering at first. Below is our handy envelope size guide which should answer all your questions.

international envelope sizes infographic


 

Sizes


The most common sizes used are normally those that can fit A4 paper inside either whole or by folding a certain number of time. These envelopes are named with a letter and a number e.g. C6.
 
C4 Envelopes

C4 size 324 x 229mm or 12.75" x 9"
C4 envelopes hold an A4 sheet unfolded.


C5 Envelopes

C5 size 229 x 162mm or 9" x 6.38"
C5 envelopes hold an A4 sheet folded once or an A5 sheet unfolded.

C6 Envelopes

C6 size 114 x 162mm or 4.5" x 6.38"
C6 envelopes hold an A4 sheet folded twice or an A5 sheet folded once.

DL Envelopes

DL size 110 x 220mm or 4.5" x 8.67
DL envelopes hold an A4 sheet folded twice or an A5 sheet folded once.

 

 

Envelopes come in standardised sizes which lets you easily choose what is right for your needs.

Below is a table of the most common sizes.


 

Metric (mm)

Envelope Size

Imperial (inches)

 

 

 

98 x 67

 

3.86" x 2.67"

102 x 76

 

4" x 3"

110 x 220

DL

4.33" x 8.67"

114 x 162

C6

4.5" x 6.38"

125 x 89

 

4.88" x 3.5"

152 x 102

 

6" x 4"

190 x 127

 

7.5" x 5"

229 x 140

 

7.5" x 5.5"

229 x 102

 

9" x 4"

229 x 162

C5

9" x 6.38"

235 x 121

 

9.25" x 4.75"

240 x 165

 

9.5" x 6.5"

241 x 178

  

9.5" x 7"

254 x 178

 

10" x 7"

270 x 216

 

10.63" x 8.5"

292 x 241

 

11.5" x 9.5"

305 x 127

 

12" x 5"

305 x 250

 

12" x 10"

318 x 267

 

12.5" x 10.5"

324 x 229

C4

12.75" x 9"

330 x 279

 

13" x 11"

350 x 248

 

13.75" x 9.75"

353 x 229

 

14" x 9"

381 x 254

 

15" x 10"

381 x 151

 

15" x 6"

394 x 318

 

15.5" x 12.5"

406 x 305

 

16" x 12"

444 x 368

 

17.5" x 14.5"

457 x 324

C3

18" x 12.75"



Envelope Styles

Envelopes can come in a variety of styles and specifications.

  • Gummed - Moisten adhesive on flap and press to seal.
  • Press Seal - Simply fold flap against back of envelope and press to seal.
  • Peel and Seal - Remove Strip to reveal adhesive and press against back of the envelope.
 
Banker Envelope

Banker Envelope Style
Wallet Envelope
Wallet Envelope Style

Pocket Envelope

Pocket Envelope Style


Our Full Range of Envelopes

 

My Basket

Your basket is empty