Not sure what size you need?

Not sure which envelope you need? Check out our guide to find the perfect sized envelope for your project. 

The most popular size Envelopes are the #10 (standard business) and 9x12 size, which accommodate a variety of items. The #10 envelope will fit a standard letter, folded in thirds, while the 9x12 will fit any document up to 8 3/4 x 11 3/4, with room to spare. Check out our Envelopes Size Guide below to find the perfect size envelope for your project.

 

Envelope Sizes - Business Envelopes

 

Small — 

#6 1/2 - (3 1/2 x 6 1/4) Fits a personal check, plus a small insert - up to 3x6.

#6 3/4 - (3 5/8 x 6 1/2) Fits a personal check, plus a small insert - up to 3 1/2 x 6 1/4.

#7 3/4 - (3 7/8 x 7 1/2) Standard small envelope, most commonly used for personal checks.

 

Standard —

#8 5/8 - (3 5/8 x 8 5/8) Can be used as a return envelope. Common for smaller checks.

#9 - (3 7/8 x 8 7/8) Return envelope. Fits comfortably inside a standard #10 envelope.

#10 - (4 1/8 x 9 1/2) Standard business envelope. Fits an 8 1/2 x 11 piece of paper folded in thirds.

 

Oversized —

#11 - (4 1/2 x 10 3/8) Larger then a standard envelopes. Can fit a #10 envelope, plus a document.

#12 - (4 3/4 x 11) Most commonly used for mailing larger documents, along with a #10 envelope.

#14 - (5 x 11 1/2) Often used for mailing folded larger documents. Can accommodate a #12 envelope. 

 

Most Popular Styles —

 

Check Envelopes - Standard #10 window or double window. Used for business checks or statements.

Security Envelopes - These envelopes have an inside tint, designed to obscure enclosed information.

Window Envelopes - Used for mailing larger checks, invoices, or standard documents. 

Double Window Envelopes - Used for mailing checks/invoices. Often used with accounting software.

Payment Envelopes - Smaller than a standard envelope. Often included when mailing a #10 envelope.

 

Envelope Sizes - Large Envelopes

 

Basic — 

 

6x9* - (Exactly 6 x 9) Can be used to fit 8 1/2 x 11 document(s), folded in half, brochures or small catalogs.

6 x 9.5 - (6 x 9 1/2) Slightly larger then a 6x9 (in length). Can be used for similar purposes. 

6.5 x 9.5 - (6 1/2 x 9 1/2) Can fit a 6x9 catalog or brochure, or several sheets of standard paper (folded).

#6 Catalog - (7 1/2 x 10 1/2) Can be used for mailing larger documents, brochures, or catalogs.

 

*The 6x9 envelope is the most common small envelope used for bulk mailings.

 

Large — 

 

#9 Catalog - (8 3/4 x 11 1/4) Can be used to mail a standard (8 1/2 x 11) document(s) or catalog. 

9x12 - (Exactly 9 x 12) Can be used to mail a stack of documents or a catalog up to 8.75 x 11.75.

9.5 x 12.5 - (9 1/2 x 12 1/2) Slightly larger then the 9x12, this envelope can hold a 9x12 presentation folder.

10x13 - (Exactly 10 x 13) Standard extra large mailing envelope. Fits larger catalogs or presentation folders.

 

*The 9x12 envelope is the most common large envelope used for bulk mailings.

 

Envelope Sizes - Invitation Envelopes

 

Standard A Series (Straight Flap) — 

 

A1 - (3 5/8 x 5 1/8) - Typically used for an RSVP envelope. Fits neatly inside an A4, A6, or larger envelope.

A2 - (4 3/8 x 5 3/4) - Typically used for an RSVP envelope. Fits neatly inside an A6, A7, or larger envelope.

4x6 - (4 1/8 x 6 1/8) - Often used for 4x6 photos or invitations. Fits inside an A7, A8, A9 or A10 envelope.

A4 - (4 1/4 x 6 1/4) - Often used for 4x6 photos or invitations. Fits inside an A7, A8, A9 or A10 envelope.

A6 - (4 3/4 x 6 1/2) - Commonly used for invitations up to 4 1/2 x 6 1/4. Fits inside an A7, A8, A9 or A10.

A7 - (5 1/4 x 7 1/4) - Also known as a 5x7 envelope. Used for many standard cards and invitations.

A8 - (5 1/2 x 8 1/8) - Used as an outer envelope. Fits a card, invitation, or insert up to 5 1/4 x 8 inches.

A9 - (5 3/4 x 8 3/4) - Used as an outer envelope. Fits cards, invitations, or inserts up to 5 1/2 x 8 1/2.

A10 - (6 x 9 1/2) - Also known as a 6x9 envelope. Fits envelopes, invitations, or inserts up 5 7/8 x 9 3/8.

 

Baronial Series (Pointed Flap) — 

 

#4 Baronial — (3 5/8 x 5 1/8) - Same size as an A1. Typically used for an RSVP envelope.

#5 1/2 Baronial — (4 3/8 x 5 3/4) - Same size as an A2. Typically used for an RSVP envelope.

Lee Baronial — (5 1/4 x 7 1/4) - Same size as an A7. Used for many standard cards and invitations.