{"id":82886,"date":"2025-12-09T00:00:00","date_gmt":"2025-12-09T07:00:00","guid":{"rendered":"https:\/\/ndf-blog.nextdayflyers.com\/blog\/?p=82886"},"modified":"2026-08-09T20:38:32","modified_gmt":"2026-08-10T03:38:32","slug":"guide-to-standard-envelope-sizes","status":"publish","type":"post","link":"https:\/\/www.nextdayflyers.com\/blog\/guide-to-standard-envelope-sizes\/","title":{"rendered":"Guide to Standard Envelope Sizes"},"content":{"rendered":"<main id='bde-main'><section class=\"bde-section-82886-100 bde-section\">\n  \n  \n\t\n\n\n\n<div class=\"section-container\"><h2 class=\"bde-heading-82886-149 bde-heading post-mark-heading\">\nKey Takeaways:\n<\/h2><div class=\"bde-rich-text-82886-101 bde-rich-text breakdance-rich-text-styles\">\n<ul>\n<li>Using standard envelope sizes offers many benefits, including compatibility with standard paper sizes, postal systems, and mail-handling equipment.<\/li>\n<li>By using standard envelope sizes, you can deliver your letters, documents, and matching accessories like folders and cards securely and professionally.<\/li>\n<li>Several factors determine the ideal envelope size, including the type and size of the letter or document, the purpose (business vs. personal use), the recipients, and the budget.<\/li>\n<\/ul>\n<\/div><div class=\"bde-rich-text-82886-148 bde-rich-text breakdance-rich-text-styles\">\n<p>With so many envelope sizes available, it can be confusing to pick the one that fits the letter or document you wish to distribute.<\/p>\n<p>To narrow down the choices, consider the type of correspondence you have. Is it a greeting card for the holiday season, a printed marketing material for high-volume mailing, or a simple thank-you note to a customer?<\/p>\n<p>Next, consider the purpose of your correspondence, the distribution method, and the size and weight of the content.<\/p>\n<p>If you\u2019re unsure which size to choose, see the envelope size chart below.<\/p>\n<\/div><h2 class=\"bde-heading-82886-102 bde-heading post-mark-heading\">\nEnvelope Size Chart\n<\/h2><div class=\"bde-code-block-82886-122 bde-code-block scrollbar-none\">\n\n  <table>\n<tbody>\n<tr>\n<th>Standard Envelope Sizes<\/th>\n<th>Popular Options<\/th>\n<\/tr>\n<tr>\n<td>Business Envelopes<\/td>\n<td>\n<ul>\n<li>#10 (4.125\u2033 x 9.5\u2033)<\/li>\n<li>A2 (4.375\u2033 x 5.75\u2033)<\/li>\n<li>A9 (5.75\u2033 x 8.75\u2033)<\/li>\n<li>A6 (4.75\u2033 x 6.5\u2033)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td>Invitation and Greeting Card Envelope<\/td>\n<td>\n<ul>\n<li>A7 (5.25\u2033 x 7.25\u2033)<\/li>\n<li>A2 (4.375\u2033 x 5.75\u2033)<\/li>\n<li>A9 (5.75\u2033 x 8.75\u2033)<\/li>\n<li>A6 (4.75\u2033 x 6.5\u2033)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td>Return Envelopes<\/td>\n<td>\n<ul>\n<li>#10<\/li>\n<li>#9 (3.875\u201d x 8.875\u201d)<\/li>\n<li>#6-\u00be (6.5\u201d x 3.625\u201d)<\/li>\n<li>A2<\/li>\n<li>A6<\/li>\n<li>A7<\/li>\n<li>A9<\/li>\n<li>6\u201d x 9\u201d<\/li>\n<li>9\u201d x 12\u201d<\/li>\n<li>10\u201d x 13\u201d<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td>Remittance Envelopes<\/td>\n<td>\n<ul>\n<li>#6-\u00be (6.5\u201d x 3.625\u201d)<\/li>\n<li>#9 (3.875\u201d x 8.875\u201d)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td>Oversized Envelopes (Catalog\/Booklet Envelopes)<\/td>\n<td>\n<ul>\n<li>6\u2033 x 9\u2033<\/li>\n<li>9\u2033 x 12\u2033<\/li>\n<li>10\u201d x 13\u201d<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n<\/div><a class=\"bde-container-link-82886-123 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/a7-envelopes\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-110 bde-heading post-mark-heading\">\nA7 (5.25\u2033 x 7.25\u2033)\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-124 bde-rich-text breakdance-rich-text-styles\">\n<p>A7 is the matching envelope size for 5\u2033 x 7\u2033 postcards, greeting cards, and invitations. It is often custom-printed with holiday-themed designs to match the occasion, or logos when used for direct mail marketing.<\/p>\n<p>This envelope features a gummed flap that creates a permanent seal when moistened.<\/p>\n<\/div><a class=\"bde-container-link-82886-146 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/10-envelopes\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-125 bde-heading post-mark-heading\">\n#10 (4.125\u2033 x 9.5\u2033)\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-126 bde-rich-text breakdance-rich-text-styles\">\n<p>Time-sensitive notices (e.g., service disconnection), bank statements, checks, and invoices often use #10. This envelope size is also the go-to option for Z-folded brochures, flyers, and letters.<\/p>\n<p>Many industries use this business envelope size because it is compatible with automated inserting machines that fold and insert paper documents, helping streamline high-volume mailings.<\/p>\n<p>#10 comes with an optional feature called \u201cwindow,\u201d a transparent panel that shows a recipient\u2019s address on the enclosed letter or document.<\/p>\n<\/div><a class=\"bde-container-link-82886-145 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/a2-envelopes\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-128 bde-heading post-mark-heading\">\nA2 (4.375\u2033 x 5.75\u2033)\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-127 bde-rich-text breakdance-rich-text-styles\">\n<p>A2 envelopes are suitable for a wide range of business and personal correspondence, from wedding invitations and RSVP cards to thank-you notes and printed marketing materials.<\/p>\n<p>These envelopes are suitable for 4.25\u2033 x 5.5\u2033 invitations, postcards, and greeting cards.<\/p>\n<\/div><a class=\"bde-container-link-82886-144 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/a9-envelopes\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-132 bde-heading post-mark-heading\">\nA9 (5.75\u2033 x 8.75\u2033)\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-131 bde-rich-text breakdance-rich-text-styles\">\n<p>A9 provides a snug fit for 5.5\u2033 x 8.5\u2033 flat cards and 11\u2033 x 8.5\u2033 folded cards (that fold to 5.5\u2033 x 8.5\u2033). These two card sizes are popular options for sending holiday greetings, announcements, and party invites.<\/p>\n<p>This envelope size is also popular among businesses that use postcard marketing because it meets USPS requirements for First-Class Mail, a cost-effective way to send large volumes of postcards to customers.<\/p>\n<\/div><a class=\"bde-container-link-82886-143 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/a6-envelopes\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-130 bde-heading post-mark-heading\">\nA6 (4.75\u2033 x 6.5\u2033)\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-129 bde-rich-text breakdance-rich-text-styles\">\n<p>A6 is another popular envelope size for greeting cards, announcements, party invites, and postcards. It provides a snug fit for 4\u2033 x 6\u2033 flat cards and 8\u2033 x 6\u2033 folded cards (that fold to 4\u2033 x 6\u2033).<\/p>\n<p>Just like A9, A6 is also a popular envelope size used by businesses across industries because it meets First-Class Mail requirements.<\/p>\n<p>This business envelope features a gummed flap that creates a permanent seal when moistened.<\/p>\n<\/div><a class=\"bde-container-link-82886-142 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/remittance-envelopes\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-134 bde-heading post-mark-heading\">\nRemittance Envelope Sizes\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-133 bde-rich-text breakdance-rich-text-styles\">\n<p>Standard remittance envelopes are available in two sizes: #6-\u00be (6.5\u2033 x 3.625\u2033) and #9 (3.875\u2033 x 8.875\u2033). Charities and non-profit organizations, especially when seeking donations and voluntary contributions, typically use these sizes.<\/p>\n<p>They are also popular for sending invoices, billing statements, and campaign donation requests from political fundraisers.<\/p>\n<\/div><a class=\"bde-container-link-82886-141 bde-container-link breakdance-link\" href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/\" target=\"_self\" data-type=\"url\">\n  \n  \n\t\n\n\n\n<h2 class=\"bde-heading-82886-136 bde-heading post-mark-heading\">\nReturn Envelope Sizes\n<\/h2>\n\n<\/a><div class=\"bde-rich-text-82886-135 bde-rich-text breakdance-rich-text-styles\">\n<p>Return envelopes don\u2019t have a single specific size. However, businesses typically use these dimensions: #10, #9, #6-\u00be, A2, A6, A7, A9, 6\u201d x 9\u201d, 9\u201d x 12\u201d, and 10\u201d x 13\u201d.<\/p>\n<p>Despite being available in a wide range of sizes, all return envelopes have the sender\u2019s address pre-printed, allowing recipients to mail something back to the sender. In some cases, they also include postage, so recipients can send them back without buying their own postage stamps.<\/p>\n<p>In essence, they simplify the process of returning documents, forms, and payments.<\/p>\n<\/div><h2 class=\"bde-heading-82886-138 bde-heading post-mark-heading\">\nOversized Envelope Sizes\n<\/h2><div class=\"bde-rich-text-82886-137 bde-rich-text breakdance-rich-text-styles\">\n<p>Oversized envelopes are often used to distribute booklets, catalogs, brochures, annual reports, branded wall calendars, and other large print materials. The most popular sizes are 6\u2033 x 9\u2033, 9\u2033 x 12\u2033, and 10\u2033 x 13\u2033.<\/p>\n<p>There is an option to order oversized envelopes with their flaps on the short side, giving them a portrait or vertical orientation.<\/p>\n<\/div><div class=\"bde-fancy-divider-82886-140 bde-fancy-divider\">\n\n\n<div class=\"bde-fancy-divider__wrapper\">\n  <div class=\"bde-fancy-divider__separator   \">\n  \t  <\/div>\n<\/div>\n\n<\/div><div class=\"bde-rich-text-82886-139 bde-rich-text breakdance-rich-text-styles\">\n<p>Choosing the right envelope size for your print materials offers many benefits, including lower costs, compatibility with standard paper and card sizes, and a professional appearance. The right size also provides adequate protection and allows the content to fit snugly.<\/p>\n<p>NextDayFlyers offers various types of envelopes suitable for high-volume mailings, marketing materials, formal correspondence, and personal use.<\/p>\n<p>These\u00a0<a href=\"https:\/\/www.nextdayflyers.com\/envelope-printing\/\">envelopes<\/a>\u00a0are highly customizable; you can print your logo or artwork so they reflect your brand or match the occasion or message.<\/p>\n<p>Aside from\u00a0<a href=\"https:\/\/www.nextdayflyers.com\/custom-promotional-printing\/custom-product-calculator\">custom printing<\/a>, you can also add special features like windows or transparent panels and square-shaped flaps. Oversized envelopes (like 6\u2033 x 9\u2033, 9\u2033 x 12\u2033, and 10\u2033 x 13\u2033) even let you place the flaps on their short side for a more modern design.<\/p>\n<\/div><\/div>\n<\/section><\/main>","protected":false},"excerpt":{"rendered":"<p>NextDayFlyers shares this guide to standard envelope sizes to help you pick the right size for your letter, postcard, billing statement, or any document you wish to distribute. <\/p>\n","protected":false},"author":59,"featured_media":68298,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_breakdance_hide_in_design_set":false,"_breakdance_tags":"","footnotes":""},"categories":[4126],"tags":[4078,4077],"class_list":["post-82886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-guides-how-tos","tag-envelope-sizes","tag-envelopes"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/posts\/82886","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/users\/59"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/comments?post=82886"}],"version-history":[{"count":5,"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/posts\/82886\/revisions"}],"predecessor-version":[{"id":84665,"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/posts\/82886\/revisions\/84665"}],"wp:attachment":[{"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/media?parent=82886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/categories?post=82886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nextdayflyers.com\/blog\/wp-json\/wp\/v2\/tags?post=82886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}