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Standard Envelope Sizes for Card Making

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Whether you are making greeting cards for fun or profit, knowing the popular standard envelope sizes is a useful part of the planning process. A list of the most popular envelope sizes for card makers is listed below in both North American and International ISO sizes.

Making cards to fit standard envelope sizes is useful if you are making a batch of cards, for instance several similar holiday cards or a batch of invitations. Designing cards to fit standard envelope sizes is also useful if you are making cards to sell as standard size envelopes can be purchased in bulk at discount prices. The right size will also ensure that your card arrives in tip-top condition. An envelope that is too small will crush or crease the card. However an envelope that is too large will allow the card to move around and may damage any embellishments.

Tips for Using Standard Size Envelopes

Here are some tips for using standard size envelopes:
  • When you pick an envelope for a card remember to factor on any additional embellishments or features in your card design which may affect the choice of an envelope size.
  • If you have to use an envelope which is too large for your card, place a thick piece of paper or card which is the same size as the envelope with your card to help stop it from moving around.
  • If your card design does not fit a standard sized envelope then consider making your own. This is a great way to add a further handmade touch to your card and will make it stand out from mass-produced alternatives.

Further Reading

  • Cambridge University - useful reading about the ISO paper and envelope sizes
  • USPS - tips for measuring cards and letters for the post
  • Kate Harper - this is useful reading about envelopes for making and selling handmade cards

Popular Standard Envelope Sizes

North American
Size Inches Millimeters
A2 4⅜ x 5¾ 111 x 146
A6 4¾ x 6½ 121 x 165
A7 5¼ x 7¼ 133 x 184
A8 5½ x 8⅛ 139 x 206
A9 5¾ x 8¾ 146 x 222
A10 6 x 9½ 152 x 241


ISO (International Standard) .
Size Inches Millimeters
C4 9 x 12.75 229 x 324
C5 162 x 229 6.38 x 9
C6 114 x 162 4.5 x 6.38 i
C7/6 81 x 162 3.19 x 6.38
C7 81 x 114 3.19 x 4.5
DL 110 x 220 4.32 x 8.69

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