How to Find the Right Envelope Size for Your Invitation

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Choose an Envelope 1/8 – 1/4 Inch Larger than Your Card or Match A-Sizes

When making invitations, envelope sizing is an important factor to consider.

Watch this quick video and read below for some helpful tips on properly sizing your invitation and envelope set.

Avoid Headaches – Always Choose Invitation Envelopes First!

When making invitations, many are inclined to design their invitations first and worry about finding envelopes later. This is a very common mistake that should be avoided. Here’s why:

Cards are cut to order, but envelopes are made in standard industry sizes. Where invitations can easily be altered to fit into an envelope, an envelope can not be altered to accommodate an invitation. You do not want to spend hours designing invitations only to find out that proper envelopes for them do not exist. And if you are thinking custom made sizes, think again. Envelope converters typically require a several thousand envelope minimum for custom work.

Now that you know the importance of choosing envelopes first, learn how to choose the right size envelopes for your invitations.

example of card and proper envelope size

Find that Perfect Fit

The guideline to the perfect fit is an envelope that is 1/8 to 1/4 of an inch larger than your card. This will allow plenty of room for your car(s) without excessive wiggle room that can make your presentation look sloppy.

Example of matching 5x7 card and envelope size. Pair A7 card with A7 envelope

Standard “A” Sizes Make it Easy

Standard “A” Sizes (A1, A2, A6, A7, etc.) are designated with an A followed by a number corresponds to specific card and envelope sizes.

For convenience & simplicity, a card and envelope with the same A size are designed to be paired together.

For example, A7 size cards and A7 size envelopes are the perfect fit:

  • A7 card size: (5 1/8 x 7)
  • A7 envelope size: (5 1/4 x 7)

No measuring required; all you have to know with A sizes is that if the numbers match, the card and envelope sizes match – easy!

Shop A7 Envelope Size – Envelopes for 5×7 Cards

We designed this handy chart of LCI Paper Standard Envelope Sizes. This should help simplify the process on pairing our cards and envelopes.

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  1. Dina Goldstein says:

    Do you have a Baronial cream or off white smooth envelope to fit an A-10 size invitation? Would you have an unlinned inner and outer envelope this size, I need 500 of them. If not, what size is the largest that would fit this request? Thank you for your prompt reply.
    Dina Goldstein

  2. JB says:

    Hi Dina,

    Unfortunately, there is no true double envelope set for an A10 size invitation. We carry an Ecru Cream A10 – 6 x 9 1/2 Envelope but it has a straight flap, not a pointed flap.

  3. Geradline Glendenning says:

    my card is 5 3/8 x 7 1/4. do you have a nice ivory envelope. Need 50.

  4. JB says:

    Hi Geraldine,

    Thank you for your interest in our envelopes. As the video shows, an envelope to accommodate your card should be 1/8 to 1/4 of an inch larger. The perfect envelope size for your card would be about 5 1/2 x 7 1/2, but we are unaware of an envelope in this size. The closest size that we offer is our A8 – 5 ½ x 8 ⅛ Envelope Ecru. This envelope is a bit wider than ideal so if you’re interested in trying it, we encourage you to first order a sample. It is an Ecru Cream color, perhaps a bit more creamy and less yellow than ivory.

  5. DJ says:

    Hello, I am looking for a 5 1/2 x 8 1/2 ivory envelope with a pointed flap. It is for my wedding invitations that came with a flat flap and will not look as nice with my wax stamp as a pointed one would. Thank you

  6. JB says:

    Hi DJ. Thank you for checking with us for wedding quality envelopes. Unfortunately, we do not carry any 5 1/2 x 8 1/2 envelopes. But a very popular envelope size is 5 3/4 x 8 3/4. We offer a wide range of 5 3/4 x 8 3/4 (A9) size envelopes.

  7. TaNeshia Clinton says:

    Can a A7 – 5 1/4 x 7 1/4 Envelope Ecru fit inside a A9 – 5 3/4 x 8 3/4 Envelope Carnival Black

  8. JB says:

    Hi TaNeshia,

    Yes, an A7 envelope will fit inside an A9 envelope. But keep in mind this is not a true inner/outer wedding envelope set. Feel free to get in touch if you have any specific questions about this. We’ll be happy to help.

  9. Sheila Frink says:

    If I am ordering the 5 1/8 x 7 landscape pocket fold, Ebenum, will it fit in the 5 1/4 x 7 1/4 envelopes or should I go one size bigger, 5 7/16 x 7 7/8, to accomodate the thickness of all of the inserts (RSVP, hotel information, map/directions)?

  10. JB says:

    Hi Sheila,

    Yes, a 5 1/4 x 7 1/4 (A7) Mailing Envelope is the correct size to accommodate our A7 Landscape Pocket Folds – 5 1/8 x 7. You should not need to go with a larger size. Please see our Pocket Fold sizing chart for the complete picture.

    For peace of mind, you may want to order an A7 Pocket Fold, A7 Mailing Envelope, and possibly cards. Load the Pocket Fold as you envision and place it into the envelope. You can bring the finished invitation ensemble into your local Post Office to have it weighed to determine the postage.

  11. Judy says:

    My daughter’s wedding invitation is 5.5 x 7.75. She would like to put a backing sheet on it to make it a little heavier. What would you suggest the size of the cardstock be so we can buy an envelope to fit?

    • Kristen says:

      Hi Judy,

      The answer to your question is dependent on the envelope you are using; but assuming you have not already purchased your envelopes, please take the following suggestions into consideration.

      The next pre-cut card size up that we offer is an A9, which measures 5 1/2 x 8 1/2. If you used a 5 1/2 x 8 1/2 (A9) card as a backing card beneath your 5 1/2 x 7 3/4 top layer, you would have just a slight border at the top and bottom of the invitation card but no border on the sides, which would be an interesting look. Keep in mind that one advantage to using this size is that we offer lots of 5 3/4 x 8 3/4 (A9) envelopes to accommodate it.

      If you would prefer a border all around your top layer, you might consider using a custom cut card that measures 5 7/8 x 8 1/8. This would give you a small, but uniform border all around, and would allow you to fit the card into a 6 x 8 1/4 inch baronial envelope. We offer these envelopes in white and ecru. If you are interested in custom cutting, please give us a call for additional information.

      Please let us know if you have any additional questions for us.

  12. Angela says:

    Hello, the reply card for me wedding invitation is 3.5 x 5. Which would be the right size envelope to purchase?

  13. Jill says:

    I have a 5×7 invitation that I would like to layer on top of an A9 card stock. After layering, adding a response card, response envelope, and information card will it all still fit in an A9 envelope? Any suggestions to share? Thanks!

    • Kristen says:

      Hi Jill,

      The more you put in an envelope, the more the sides bow out, making it less accommodating. However, you should have no problem placing the items you mentioned inside of your envelope. Just be sure it’s sealed well before mailing.

  14. Jennifer says:

    I was wondering if you had a recommendation for an outer envelope for our wedding invitations. The size we are using for the inner envelope and cardstock is the A9.

  15. Christan says:

    Hello, I am using a seal and send invitation but I wanted to used a envelope because I didnt want the invite to get dirty or torn in the mailing process. This invite is measured at 5 5/8 and 4 1/8…what size do you suggest I purchase?

    • Kristen says:

      Hi Christian,

      Since seal and sends are not designed to go in envelopes, we do not have one that is a great fit unfortunately. However, they do fit inside of an A6 Envelope – just keep in mind there will be a bit more slack between the envelope and the invitation than average.

  16. juvina says:

    Hi, I have an invite that measures 5×7 and I want to attach a colored backer card to this to show a slight border around all edges. What size backer do you recommend so that I can still fit into a A9 envelope? Also, what weight do you recommend for the top invite and what weight do you recommend for the backer card to keep postage costs as low as possible? Thank you 🙂

    • Kristen says:

      Hi Juvina,

      An A9 envelope measures 5 3/4 x 8 3/4 so your backer card can be up to 5 1/2 x 8 1/2 inches. We have this size pre-cut:

      5 1/2 x 8 1/2 A9 cards

      Of course, this will leave you with a very large border. You might consider trimming your 5 x 7 card a bit and laying it on top of an A7 (5 1/8 x 7) card and using an A7 envelope (5 1/4 x 7 1/4).

      As far as weight goes, this is really a matter of preference. Some people prefer very thick invitations, some prefer thinner. If you have a very thick 5 x 7 card, you can probably go just slightly heavier on the backer, but if you 5 x 7 card is not very thick, you can go heavier on the backer.

  17. Lauren says:

    I have a 5 x 6 1/2 greeting card. What is the correct size envelope for that greeting card?

    • Kristen says:

      Hi Lauren,

      Typically the right size envelope for your card is one that is 1/8 – 1/4 inch larger than the card on both the length and width ends. However, as your card is an uncommon size, our best fit envelope would be our 6 3/4 square envelopes.

  18. Bobbi says:

    I am designing a Wedding Anniversary invitation for a friend. I am considering using your envelops

    Code: EBEGLD
    Paper: 70lb Text
    Density: 104 g/m2
    Format: Double Lined
    Finished Size: Inner Envelope 5 1/8 x 6 7/8 Outer Envelope 5 1/4 x 7 1/4
    Color: Ecru Gold Lined
    Liner: Pearlescent
    Finish: Matte
    Brand: LCI
    Printer: Laser,Inkjet [disclaimer]

    What will be the best size for the invites, if I also need to include a RSVP/menu card and return envelop?

    • Kristen says:

      Hi Bobbi,

      Typically you want a card is is 1/8 to a 1/4 inch smaller than your envelope, so to fit inside of the Embassy Inner envelope, you need a card that is 5 x 6 3/4 or smaller.

      The most popular r.s.v.p. size is an A1. A1 response cards measure 3 1/2 x 4 7/8 and A1 response envelopes measure 3 5/8 x 5 1/8.

  19. jacklyn says:

    hi there!
    i have a 6×8 invitation and a standard reply card with envelope. what envelope size would be suitable for all these items? would 6.13 x 8.38 work?


    • Kristen says:

      Hi Jacklyn,

      The rule of thumb is to go with an envelope that is 1/8 to 1/4 inch larger than the card, so that size envelope would work for you, yes.

  20. Emi says:


    Hi I got A7 envelopes (AP7E-SW)for A7 invitations…
    The invitation has a small charm that seems to pierce the envelope.
    There is other thicker envelope on snow willow?

    • Kristen says:

      For metallic envelopes, we do not have any heavier envelopes. However, you might consider using a layer of tissue or vellum over your invite so that the charm does not pierce through the envelope.