3. Envelope Size
Envelopes come in a wide range of styles, including:
- Letter envelope sizes, including business envelope sizes
- Invitation envelope sizes, including announcement envelopes, as well as baronial and Monarch envelope sizes
- Catalog and manila envelope sizes
- Square envelope sizes
- Small envelope sizes, including coin and mini-lope envelope sizes
To make matters even more complicated, each of these styles comes in a range of different sizes. We’ll spend the rest of this envelope size guide digging into different US envelope sizes and other standard envelope sizes.
Let’s peek under the flap!
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Standard Envelope Sizes
No. 10 regular is the most common envelope size (bills and other business correspondence are typically sent using this size), but there are countless standard envelope sizes available for every imaginable purpose, from teeny-tiny mini-lopes to full size 9” x 12” catalog envelopes.
These are the most common standard envelope sizes used for printing and mailing:
Standard Envelope Sizes for Printing & Mailing
Shop standard envelope sizes:
A1 Envelopes
A2 Envelopes
A6 Envelopes
A7 Envelopes
A8 Envelopes
Monarch Envelopes
No. 10 Commercial Envelopes
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Letter Envelope Sizes
Letter or correspondence envelopes are the most popular envelope style for general correspondence, including most business and personal correspondence. They are typically broken down into two further categories—business and commercial.
These envelopes are used for a variety of purposes, including:
- Business and personal correspondence
- Billing
- Statements
- Legal correspondence
- Invoices
- Promotional mailers
- Handwritten letters
Business Envelope Sizes
Despite their name, business envelopes are commonly used for both business and personal correspondence. They are available in a number of styles with square, side, or pointed flaps (called “commercial flaps”), as well as with or without windows. The term “regular” indicates that the envelope does not have a window.
They are commonly used for:
- Business correspondence
- Bills and notices
Business Envelope Size Chart
Shop business envelope sizes:
No. 6 ¾ Regular Envelopes
No. 9 Regular
No. 10 Regular
No. 10 Policy
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Invitation Envelope Sizes
Invitation envelope sizes include:
- Announcement envelopes
- Baronial and monarch envelopes
Announcement Envelope Sizes
Announcement envelopes feature a side seam and a square flap. They are more casual than other styles and are available in a wide range of different paper stocks, including different paper finishes and basis weights.
They are commonly used for:
- Invitations and wedding stationery
- Greeting and holiday cards
- Photos
- Promotional or marketing material
Announcement Envelope Size Chart
Shop announcement envelope sizes:
A1 Envelopes
A2 Envelopes
A6 Envelopes
A7 Envelopes
A8 Envelopes
A9 Envelopes
A10 Envelopes
Baronial and Monarch Envelope Sizes
Baronial envelopes have diagonal seams with a pointed flap. They are available in many of the same sizes and paper finishes as Announcement envelopes, but their flap style and seam direction make them a more formal alternative. Monarch envelopes are a type of baronial envelopes, but only come in one size (3 ⅞” x 7 ½”).
They are commonly used for:
- Formal announcements
- Wedding invitations
- Hand-lettered notes
Baronial and Monarch Envelope Size Chart
Shop baronial and Monarch envelope sizes:
No. 6 Baronial Envelopes
Monarch Envelopes
Lee Envelopes
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Catalog and Manila Envelope Sizes
Catalog envelopes are constructed using Kraft paper or Manila or other card stocks, with a strong center seam and a heavily gummed flap along the shorter dimension. They’re the perfect size for sending paper documents that can’t be folded, and their strong construction makes them durable and ideal for mailing heavy-weight materials.
They are commonly used for:
- Catalogs
- Large booklets
- Annual reports
- Documents and contracts
- Brochures
- Sales materials
Catalog and Manila Envelope Size Chart
Shop catalog and manila envelope sizes:
No.1 Catalog Envelopes
No. 10 ½ Catalog Envelopes
No. 13 ½ Catalog Envelopes
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Square Envelope Sizes
Square envelopes are a modern and stylish square shape (surprise!) with side seams and contemporary flat flap.
PRO TIP: The United States Postal Service considers square envelopes to be a non-standard, “non-machineable” size, so they require an extra $0.44 (or more, depending on size) in postage per letter in addition to the normal postage required.
They are commonly used for:
- Announcements
- Card making
- Invitations
- Holiday cards
- Greeting cards
Square Envelope Size Chart
Shop square envelope sizes:
No. 5 Square Envelopes
No. 5 ½ Square Envelopes
No. 6 Square Envelopes
No. 8 Square Envelopes
No. 8 ½ Square Envelopes
No. 9 ½ Square Envelopes
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Small Envelope Sizes
Coin and Mini-lope Envelope Sizes
Coin envelopes and mini-lopes are small specialty envelopes that are typically too small to mail, but they’re ideal for hand-delivered notes, coins, or gift cards. Mini-lopes are more decorative with eye-catching colors and styles, while coin envelopes are also commonly made of Manila card stock.
Coin and Mini-lope Envelope Size Chart
Shop coin and mini-lope envelope sizes:
No. 1 Coin Envelopes
Mini-lopes
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Wrapping Up
Envelopes come in copious styles and sizes, which can make it tricky to know which envelope to use for what purpose. The good news is that there are no “rules” when it comes to selecting an envelope, and you can usually adopt the “if I fits, I sits” approach (IYKYK). So long as the envelope contains the item you are sending and it meets postal regulations, you can send it on its way knowing it will arrive.
Shop all envelope sizes:
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