1-800-388-5122 Careers Contact Us Search Menu Envelope Size Charts Standard Envelope Sizes You are here Home > Envelope Know-How > Envelope Size Charts Common Envelope Sizes Tension produces custom envelopes based on your specific requirements, so to us there is no "standard size" envelope. The following charts represent typical sizes for common envelope size. However, we rely on your explicit instructions to deliver accurate, final specifications. Click below to jump to each section: Business envelopes Booklet envelopes Catalog envelopes Business Envelopes for Direct and Transactional Mail Sizes Business envelopes are widely used for direct mail and transactional mail (e.g., monthly statements or bills). A #10 envelope is the popular business envelope size, and is used for both direct mail and transactional mail. Want an in-depth look at popular envelope products? Read our blog "How Big is a Number 10 Envelope?" or learn more about #10 envelopes on our product page. Or, check out "How Big is a Number 9 Envelope?" or learn more about #9 envelopes on our product page. See below for standard sizes of business envelopes*. COMMON ENVELOPE NAME STANDARD SIZE MAXIMUM ENCLOSURE SIZE 6-1/4 envelope 3-1/2 x 6 inches 3-1/4 x 5-3/4 inches 6-3/4 envelope 3-5/8 x 6-1/2 inches 3-3/8 x 6-1/4 inches 7 envelope 3-3/4 x 6-3/4 inches 3-1/2 x 6-1/2 inches 8-5/8 envelope 3-5/8 x 8-5/8 inches 3-3/8 x 8-3/8 inches 9 envelope 3-7/8 x 8-7/8 inches 3-5/8 x 8-5/8 inches 10 envelope 4-1/8 x 9-1/2 inches 3-7/8 x 9-1/4 inches 11 envelope 4-1/2 x 10-3/8 inches 4-1/4 x 10-1/8 inches 12 envelope 4-3/4 x 11 inches 4-1/2 x 10-3/4 inches 14 envelope 5 x 11-1/2 inches 4-3 /4 x 11-1/4 inches *Standard envelope sizes are listed for illustrative purposes. We rely on your explicit instructions to deliver accurate, final specifications. Booklet Envelopes Sizes Booklets are open-side, double side seam envelopes that come in many standard sizes*. Learn more about open-side envelopes, and the difference between an open-side and open-end envelope in our popular blog, "Envelope Basics: The Grand Opening." COMMON ENVELOPE NAME STANDARD SIZE MAXIMUM ENCLOSURE SIZE 6 envelope 5-3/4 x 8-7/8 inches 5-1/2 x 8-5/8 inches 6-1/2 envelope 6 x 9 inches 5-3/4 x 8-3/4 inches 6-5/8 envelope 6 x 9-1/2 inches 5-3/4 x 9-1/4 inches 9 envelope 8-3/4 x 11-1/2 inches 8-1/2 x 11-1/4 inches 9-1/2 envelope 9 x 12 inches 8-3/4 x 11-3/4 inches 10 envelope 9-1/2 x 12-5/8 inches 9-1/4 x 12-3/8 inches *Standard envelope sizes are listed for illustrative purposes. We rely on your explicit instructions to deliver accurate, final specifications. Catalog Envelopes Sizes Catalogs are open-end, center-seam or single side seam envelopes with the seal flap on the short dimension. They are often used for policy mailers and/or insurance information that is not meant to be folded. Below are three standard sizes* of catalog envelopes: COMMON ENVELOPE NAME STANDARD SIZE MAXIMUM ENCLOSURE SIZE 6 x 9 envelope 6 x 9 inches 5-3/4 x 8-3/4 inches 9 x 12 envelope 9 x 12 inches 8-3/4 x 11-3/4 inches 10 x 13 envelope 10 x 13 inches 9-3/4 x 12-3/4 inches *Standard envelope sizes are listed for illustrative purposes. We rely on your explicit instructions to deliver accurate, final specifications. Envelope Products Print Marketing Envelope Know-How About Tension Blog Privacy Policy Site Map Terms and Conditions Tension Headquarters 819 E. 19th Street Kansas City, MO 64108-1781 1-800-388-5122 Tension Packaging & Automation Tension Corporation © 2021 Tension Envelope Corporation. All rights reserved.