Envelope Sizing made Easy

    • Envelopes are almost always converted from text weight paper. The heavier the weight number, the heavier the envelope. A basic economy envelope will be converted from 20/50# paper. A nicer Invitation Envelope may be converted from 80lb text weight paper.  If you need more information on paper weights, be sure to check out our Paper Weights Simplified Article
    • Announcement Envelopes such as A1, A2, A6, A7 and A9, generally have a square flap.
    • We also sell Announcement envelopes that have a long triangular flap, these are called Euro Flap or deep flap envelopes.
    • Baronial envelopes have a pointed flap and correspond to announcement envelope sizings: A1 Envelopes = 4 Bar Envelopes; A2 Envelopes = 5-1/2 Baronial Envelopes, A6 Envelopes = 6 Bar Envelopes and A7 Envelopes = Lee Envelopes.
    • Cards, letter, invitations and inserts must all be smaller than their corresponding envelope size.  Be sure to read our handy article on Choosing the Correct Card Stock or Paper Size
    • The sizing for Square Envelopes match their name. For instance, a 6 inch square envelope measures 6"x6".
    • PLEASE NOTE: Enclosures for Square Envelopes must be at least ¼ “ smaller than the envelope size. The invitation size for a 6 inch square envelopes would need to be 5.75 inches by 5.75 inches or smaller (We recommend a 5.5" square invitation for a 6" square envelope). A 6 inch square envelope will not hold a 6 inch square invitation.
    • A handy Guide for choosing your perfect invitation envelope can be found at the CutCardStock Blog.
    • Be sure to check United States Postal Service for additional costs and sizing restrictions for specialty envelopes.
    • Checkout our article on Envelope Addressing 101 andFun Envelope Addressing Ideas

    Paper and Envelope Size Chart

    Type Envelope Size Enclosed Size Popular Use 
    A1 (4 Bar) 3.625" x 5.125"

    3.475" x 4.874"

    3" x 5"

    Response Cards, RSVP Cards


    A2 (5 1/2 Bar) 4.375" x 5.75" 4.25" x 5.5"

    Party Invitations, Annoucements

    Thank You Notes

    A4 4.25" x 6.25" 4" x 6" Save the Dates, Party announcements, Birth announcements
    A6 (6 Bar) 4.75" x 6.5"

    4.625" x 6.25"

    4.5" x 6.25"

    Invitations, Announcements, 

    Save The Dates

    A7 (Lee) 5.25" x 7.25"

    5" x 7"

    5.125" x 7"

    Very Popular for Wedding Invitations,

    Greeting Cards, Party Invitations, 

    Announcements, etc.

    A8 5.5" x 8.125" 5.125" x 7.75" Wedding Invitations
    A9 5.75" x 8.75" 5.5" x 8.5"

    Wedding Invitations, Other Invitations, 

    Greeting Cards

    No. 10 4.125" x 9.5" 4" x 9.25"

    Announcements, Party Invitations,

    Wedding Invitations, Business Sized Envelope