{"id":154640,"date":"2022-04-11T13:42:36","date_gmt":"2022-04-11T13:42:36","guid":{"rendered":"https:\/\/sdcmainprod.wpengine.com\/usps\/first-class-mail-classification-tool\/"},"modified":"2024-11-06T21:01:07","modified_gmt":"2024-11-06T21:01:07","slug":"first-class-mail-classification-tool","status":"publish","type":"page","link":"https:\/\/www.stamps.com\/usps\/first-class-mail-classification-tool\/","title":{"rendered":"First Class Mail Shape Based Classification Tool"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\" id=\"h-determine-if-your-mail-piece-is-a-postcard-letter-large-envelope-or-package\">Determine if your mail piece is a Postcard, Letter, Large Envelope, or Package<\/h3>\n\n\n\n<p>For First-Class Mail\u00ae, USPS rates are based on the size and thickness of your mail piece. Follow the instructions below to determine the type of First-Class Mail\u00ae you are trying to send.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Determine if your mail piece is a Postcard, Letter, Large Envelope, or Package For First-Class Mail\u00ae, USPS rates are based on the size and thickness of your mail piece. Follow the instructions below to determine the type of First-Class Mail\u00ae you are trying to send.<\/p>\n","protected":false},"author":71,"featured_media":0,"parent":155747,"menu_order":0,"comment_status":"open","ping_status":"open","template":"templates\/generic-mail-classification-tool.php","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-154640","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.1 (Yoast SEO v25.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Stamps.com - USPS First Class Mail Classification Tool<\/title>\n<meta name=\"description\" content=\"USPS First Class Mail classification tool helps you determine if your mailpiece is a letter, postcard, large envelope, or package.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.stamps.com\/usps\/first-class-mail-classification-tool\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"First Class Mail Shape Based Classification Tool\" \/>\n<meta property=\"og:description\" content=\"USPS First Class Mail classification tool helps you determine if your mailpiece is a letter, postcard, large envelope, or package.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.stamps.com\/usps\/first-class-mail-classification-tool\/\" \/>\n<meta property=\"og:site_name\" content=\"Stamps.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/stampscom\/\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-06T21:01:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.stamps.com\/wp-content\/uploads\/2025\/04\/img-stamps-PreviewTile-1200x675-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@stampscom\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.stamps.com\/usps\/first-class-mail-classification-tool\/\",\"url\":\"https:\/\/www.stamps.com\/usps\/first-class-mail-classification-tool\/\",\"name\":\"Stamps.com - 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