{"id":3287,"date":"2026-11-13T16:36:28","date_gmt":"2026-11-13T15:36:28","guid":{"rendered":"https:\/\/blog.3dbinpacking.com\/?p=3287"},"modified":"2026-11-13T16:37:44","modified_gmt":"2026-11-13T15:37:44","slug":"standard-shipping-box-sizes","status":"publish","type":"post","link":"https:\/\/blog.3dbinpacking.com\/en\/standard-shipping-box-sizes\/","title":{"rendered":"Standard Shipping &amp; Packing Box Sizes: Complete Dimensions Reference"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top kksr-disabled\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;3287&quot;,&quot;readonly&quot;:&quot;1&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Standard Shipping \\u0026amp; Packing Box Sizes: Complete Dimensions Reference&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n\n<p>A reference for corrugated box sizes, carrier flat-rate packaging and the dimensional (DIM) weight rules that turn an oversized box into a bigger invoice. Every figure links to the carrier, USPS or box-maker page it comes from. Sources checked November 13, 2026.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>L \u00d7 W \u00d7 H<\/strong><br>INSIDE DIMENSIONS: HOW BOX MAKERS LIST SIZES<\/td><td><strong>139<\/strong><br>DIM DIVISOR: FEDEX, UPS DAILY RATES &amp; USPS<\/td><td><strong>1,728 cu. in.<\/strong><br>USPS: DIM WEIGHT APPLIES ONLY ABOVE 1 CUBIC FOOT<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Every number in this guide links to the page it comes from. Where I calculate something myself, it is plain arithmetic and I show the working. That is the only way I know to keep a reference like this honest, because carrier rules change and a figure with no source goes stale without anyone noticing.<\/p>\n\n\n\n<p><strong>Table of Contents<\/strong><\/p>\n\n\n\n<p><a href=\"#h_100\"><u>1. How Shipping Box Dimensions are Measured<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_102\"><u>Corrugated Box Strength Indicators<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_104\"><u>2. Standard Shipping Box Sizes: Dimensions Reference Chart<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_106\"><u>3. Carrier Flat-Rate Box Sizes (USPS, UPS &amp; FedEx)<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_108\"><u>3.1 USPS Priority Mail Flat-Rate Sizes<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_110\"><u>3.2 UPS Simple Rate &amp; FedEx One Rate Packaging<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_112\"><u>4. Carrier Envelopes &amp; Soft Packaging<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_114\"><u>5. How Box Size Directly Affects Shipping Costs: The DIM Weight Connection<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_116\"><u>The Financial Impact of Box Over-Sizing<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_900\"><u>Worked Examples From the Sources<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_118\"><u>6. Practical Decision Framework: Which Carrier Rule Applies to Your Package<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_120\"><u>7. Frequently Asked Questions (FAQ)<\/u><\/a><\/p>\n\n\n\n<p><a href=\"#h_901\"><u>Sources and Further Reading<\/u><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_100\"><\/a><strong>1. How Shipping Box Dimensions are Measured<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Box makers list every size as Length \u00d7 Width \u00d7 Height (L \u00d7 W \u00d7 H). The part that trips people up:&nbsp;<a href=\"https:\/\/www.uline.com\/CustomerService\/ULINE_FAQ_Ans?FAQ_ID=57\"><u>Uline<\/u><\/a>&nbsp;states that listed box dimensions are always inside dimensions. The packed carton is bigger.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Length (L):<\/strong>&nbsp;The longest side of the box that has a flap (<a href=\"https:\/\/img.uline.com\/is\/content\/uline\/BoxGuide_ENUS_pdf\"><u>Uline Box Guide<\/u><\/a>).<\/li>\n\n\n\n<li><strong>Width (W):<\/strong>&nbsp;The other side that has a flap, always shorter than the length.<\/li>\n\n\n\n<li><strong>Height (H) \/ Depth:<\/strong>&nbsp;The only dimension without a flap. Height does not include the flaps.<\/li>\n<\/ul>\n\n\n\n<p><strong>Inside vs. outside dimensions:<\/strong>&nbsp;Uline&#8217;s 12 \u00d7 9 \u00d7 6 in. 32 ECT box, for example, measures 12\u215c \u00d7 9\u215c \u00d7 6\u215d in. on the outside, with a manufacturing variance of \u00b1\u215b in. (<a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-18339\/Corrugated-Boxes-32-ECT\/12-x-9-x-6-Lightweight-32-ECT-Corrugated-Boxes\"><u>Uline<\/u><\/a>). Run your DIM calculation on outside measurements, and note that rounding differs by carrier: FedEx and UPS round each side to the nearest whole inch, while USPS rounds up (details in section 5).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"h_102\"><\/a><strong>Corrugated Box Strength Indicators<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Two ratings show up on almost every box specification:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Edge Crush Test (ECT):<\/strong>&nbsp;An edge crush rating in pounds per linear inch. 32 ECT is the most common general-purpose grade and handles products up to about 65 lbs. 44 ECT is roughly equivalent to the old 275# Mullen specification and handles up to about 95 lbs. The same source lists the NMFC Item 222 minimums for single-wall ECT boxes: 32 ECT, 65 lbs and 75 in. combined length, width and height; 44 ECT, 95 lbs and 95 in. (<a href=\"https:\/\/www.corrugatednews.com\/blog\/understanding-board-grades\"><u>Corrugated News<\/u><\/a>).<\/li>\n\n\n\n<li><strong>Bursting Test (Mullen):<\/strong>&nbsp;200# test means the board bursts at 200 psi. The same source lists it as roughly equivalent to 32 ECT. It measures burst resistance, not edge crush (<a href=\"https:\/\/www.corrugatednews.com\/blog\/understanding-board-grades\"><u>Corrugated News<\/u><\/a>).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_104\"><\/a><strong>2. Standard Shipping Box Sizes: Dimensions Reference Chart<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Uline lists&nbsp;<a href=\"https:\/\/www.uline.com\/Grp_9\/Corrugated-Boxes\"><u>over 1,700 stock box sizes<\/u><\/a>. The table shows eight of them, each linked to its catalog item. Sizes are inside dimensions. The last column divides the inside volume by 139 as a reference point only: carriers measure the outside, so the real DIM figure is higher.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Inside Size (L \u00d7 W \u00d7 H inches)<\/strong><\/td><td><strong>Uline Catalog Item<\/strong><\/td><td><strong>Inside Volume (cu. in.)<\/strong><\/td><td><strong>Inside Volume \u00f7 139 (lbs)<\/strong><\/td><td><strong>Outside Size<\/strong><\/td><\/tr><tr><td><strong>6\u2033 \u00d7 4\u2033 \u00d7 2\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-20491\/Corrugated-Boxes-200-Test\/6-x-4-x-2-Corrugated-Boxes\">S-20491<\/a><\/td><td>48<\/td><td>0.35<\/td><td>See item page<\/td><\/tr><tr><td><strong>8\u2033 \u00d7 6\u2033 \u00d7 4\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-4080\/Corrugated-Boxes-200-Test\/8-x-6-x-4-Corrugated-Boxes\">S-4080<\/a><\/td><td>192<\/td><td>1.38<\/td><td>See item page<\/td><\/tr><tr><td><strong>10\u2033 \u00d7 8\u2033 \u00d7 6\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-16709\/Heavy-Duty-Boxes\/10-x-8-x-6-275-lb-Heavy-Duty-Corrugated-Boxes\">S-16709 (275 lb)<\/a><\/td><td>480<\/td><td>3.45<\/td><td>See item page<\/td><\/tr><tr><td><strong>12\u2033 \u00d7 9\u2033 \u00d7 6\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-18339\/Corrugated-Boxes-32-ECT\/12-x-9-x-6-Lightweight-32-ECT-Corrugated-Boxes\">S-18339 (32 ECT)<\/a><\/td><td>648<\/td><td>4.66<\/td><td>12\u215c \u00d7 9\u215c \u00d7 6\u215d (\u00b1\u215b); Uline lists DIM weight 6 lbs<\/td><\/tr><tr><td><strong>14\u2033 \u00d7 12\u2033 \u00d7 6\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-4987\/Corrugated-Boxes-200-Test\/14-x-12-x-6-Corrugated-Boxes\">S-4987<\/a><\/td><td>1,008<\/td><td>7.25<\/td><td>See item page<\/td><\/tr><tr><td><strong>16\u2033 \u00d7 12\u2033 \u00d7 8\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-22581\/Heavy-Duty-Boxes\/16-x-12-x-8-275-lb-Double-Wall-Corrugated-Boxes\">S-22581 (275 lb)<\/a><\/td><td>1,536<\/td><td>11.05<\/td><td>See item page<\/td><\/tr><tr><td><strong>18\u2033 \u00d7 16\u2033 \u00d7 12\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-21546\/Corrugated-Boxes-32-ECT\/18-x-16-x-12-Lightweight-32-ECT-Corrugated-Boxes\">S-21546 (32 ECT)<\/a><\/td><td>3,456<\/td><td>24.86<\/td><td>See item page<\/td><\/tr><tr><td><strong>20\u2033 \u00d7 20\u2033 \u00d7 20\u2033<\/strong><\/td><td><a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-4201\/Corrugated-Boxes-200-Test\/20-x-20-x-20-Corrugated-Boxes\">S-4201<\/a><\/td><td>8,000<\/td><td>57.55<\/td><td>See item page<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_106\"><\/a><strong>3. Carrier Flat-Rate Box Sizes (USPS, UPS &amp; FedEx)<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Flat-rate programs price by package size rather than weight, but each has its own limits. USPS Priority Mail Flat Rate boxes and envelopes allow up to 70 lbs (<a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\"><u>USPS<\/u><\/a>). FedEx One Rate prices by packaging size, destination and <a href=\"https:\/\/blog.3dbinpacking.com\/en\/micro-fulfillment-centers\/\">delivery speed<\/a>, and anything over 50 lbs ships at standard rates based on dimensional weight and zone (<a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\"><u>FedEx<\/u><\/a>). UPS Simple Rate prices by volume tier and speed rather than weight or distance, and packages over 50 lbs or 1,728 cu. in. do not qualify (<a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\"><u>UPS<\/u><\/a>).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"h_108\"><\/a><strong>3.1 USPS Priority Mail Flat-Rate Sizes<\/strong><strong><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>USPS Item<\/strong><\/td><td><strong>Outside Dimensions (inches)<\/strong><\/td><td><strong>Max Weight<\/strong><\/td><td><strong>Inside Dimensions (inches)<\/strong><\/td><\/tr><tr><td><strong>Small Flat Rate Box<\/strong><\/td><td>8-11\/16 \u00d7 5-7\/16 \u00d7 1-3\/4<\/td><td>70 lbs<\/td><td>8-5\/8 \u00d7 5-3\/8 \u00d7 1-5\/8<\/td><\/tr><tr><td><strong>Medium Flat Rate Box (Top-Loading)<\/strong><\/td><td>11-1\/4 \u00d7 8-3\/4 \u00d7 6<\/td><td>70 lbs<\/td><td>11 \u00d7 8-1\/2 \u00d7 5-1\/2<\/td><\/tr><tr><td><strong>Medium Flat Rate Box (Side-Loading)<\/strong><\/td><td>14-1\/8 \u00d7 12 \u00d7 3-1\/2<\/td><td>70 lbs<\/td><td>13-5\/8 \u00d7 11-7\/8 \u00d7 3-3\/8<\/td><\/tr><tr><td><strong>Large Flat Rate Box<\/strong><\/td><td>12-1\/4 \u00d7 12 \u00d7 6<\/td><td>70 lbs<\/td><td>12 \u00d7 11-3\/4 \u00d7 5-1\/2<\/td><\/tr><tr><td><strong>Flat Rate Envelope<\/strong><\/td><td>12-1\/2 \u00d7 9-1\/2<\/td><td>70 lbs<\/td><td>Flat envelope<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"h_110\"><\/a><strong>3.2 UPS Simple Rate &amp; FedEx One Rate Packaging<\/strong><strong><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Carrier &amp; <a href=\"https:\/\/blog.3dbinpacking.com\/en\/how-to-calculate-how-many-boxes-will-fit-in-a-container\/\">Container<\/a> Name<\/strong><\/td><td><strong>Dimensions (L \u00d7 W \u00d7 H inches)<\/strong><\/td><td><strong>Pricing Basis &amp; Limits<\/strong><\/td><td><strong>Source<\/strong><\/td><\/tr><tr><td><strong>UPS Simple Rate: Extra Small<\/strong><\/td><td>1\u2013100 cu. in. (e.g. 4\u00d74\u00d74, 6\u00d74\u00d74, 8\u00d76\u00d72)<\/td><td>Volume tier and speed, not weight or distance; up to 50 lbs<\/td><td><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>UPS Simple Rate: Small<\/strong><\/td><td>101\u2013250 cu. in. (e.g. 6\u00d76\u00d76, 8\u00d76\u00d75, 12\u00d79\u00d72)<\/td><td>Volume tier and speed, not weight or distance; up to 50 lbs<\/td><td><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>UPS Simple Rate: Medium<\/strong><\/td><td>251\u2013650 cu. in. (e.g. 8\u00d78\u00d78, 12\u00d79\u00d76, 13\u00d711\u00d72)<\/td><td>Volume tier and speed, not weight or distance; up to 50 lbs<\/td><td><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>UPS Simple Rate: Large<\/strong><\/td><td>651\u20131,050 cu. in. (e.g. 10\u00d710\u00d710, 12\u00d712\u00d77, 15\u00d711\u00d76)<\/td><td>Volume tier and speed, not weight or distance; up to 50 lbs<\/td><td><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>UPS Simple Rate: Extra Large<\/strong><\/td><td>1,051\u20131,728 cu. in. (e.g. 12\u00d712\u00d712, 16\u00d712\u00d79, 18\u00d712\u00d76)<\/td><td>Volume tier and speed, not weight or distance; up to 50 lbs; max 1,728 cu. in.<\/td><td><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>FedEx One Rate: Extra Small Box<\/strong><\/td><td>7-1\/4 \u00d7 2-1\/2 \u00d7 4-11\/16<\/td><td>Packaging size, destination and speed; up to 50 lbs<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx One Rate: Small Box<\/strong><\/td><td>10-7\/8 \u00d7 1-1\/2 \u00d7 12-3\/8, or 8-3\/4 \u00d7 2-5\/8 \u00d7 11-1\/4<\/td><td>Packaging size, destination and speed; up to 50 lbs<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx One Rate: Medium Box<\/strong><\/td><td>11-1\/2 \u00d7 2-3\/8 \u00d7 13-1\/4, or 8-3\/4 \u00d7 4-3\/8 \u00d7 11-1\/4<\/td><td>Packaging size, destination and speed; up to 50 lbs<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx One Rate: Large Box<\/strong><\/td><td>12-3\/8 \u00d7 3 \u00d7 17-1\/2, or 8-3\/4 \u00d7 7-3\/4 \u00d7 11-1\/4<\/td><td>Packaging size, destination and speed; up to 50 lbs<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx One Rate: Extra Large Box<\/strong><\/td><td>11-7\/8 \u00d7 10-3\/4 \u00d7 11, or 15-3\/4 \u00d7 14-1\/8 \u00d7 6<\/td><td>Packaging size, destination and speed; up to 50 lbs<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_112\"><\/a><strong>4. Carrier Envelopes &amp; Soft Packaging<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Mailer box and poly mailer sizes vary by supplier, so this table lists only the soft packaging that USPS and FedEx publish dimensions for. Dimensions are shown as the carriers publish them.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Packaging<\/strong><\/td><td><strong>Dimensions (inches)<\/strong><\/td><td><strong>Program \/ Limit<\/strong><\/td><td><strong>Source<\/strong><\/td><\/tr><tr><td><strong>FedEx Envelope<\/strong><\/td><td>9-1\/2 \u00d7 12-1\/2<\/td><td>FedEx One Rate packaging<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx Envelope, reusable<\/strong><\/td><td>9-1\/2 \u00d7 15-1\/2<\/td><td>FedEx One Rate packaging<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx Pak<\/strong><\/td><td>10-1\/4 \u00d7 12-3\/4, or 12 \u00d7 15-1\/2<\/td><td>FedEx One Rate packaging<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx Padded Pak<\/strong><\/td><td>11-3\/4 \u00d7 14-3\/4<\/td><td>FedEx One Rate packaging<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>FedEx Reusable Sturdy Pak<\/strong><\/td><td>10 \u00d7 14-1\/2<\/td><td>FedEx One Rate packaging<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a><\/td><\/tr><tr><td><strong>USPS Flat Rate Envelope<\/strong><\/td><td>12-1\/2 \u00d7 9-1\/2<\/td><td>Priority Mail Flat Rate; up to 70 lbs<\/td><td><a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\">USPS<\/a><\/td><\/tr><tr><td><strong>USPS Legal Flat Rate Envelope<\/strong><\/td><td>15 \u00d7 9-1\/2<\/td><td>Priority Mail Flat Rate; up to 70 lbs<\/td><td><a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\">USPS<\/a><\/td><\/tr><tr><td><strong>USPS Padded Flat Rate Envelope<\/strong><\/td><td>12-1\/2 \u00d7 9-1\/2<\/td><td>Priority Mail Flat Rate; up to 70 lbs<\/td><td><a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\">USPS<\/a><\/td><\/tr><tr><td><strong>USPS Small Flat Rate Envelope<\/strong><\/td><td>10 \u00d7 6<\/td><td>Priority Mail Flat Rate; up to 70 lbs<\/td><td><a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\">USPS<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_114\"><\/a><strong>5. How Box Size Directly Affects Shipping Costs: The DIM Weight Connection<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Carriers bill the greater of actual weight and dimensional (DIM) weight. The divisor and the rounding rules depend on the carrier, and they are not identical:<\/p>\n\n\n\n<p>The DIM weight formula is:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>DIM weight (lbs) = [ Length (in) \u00d7 Width (in) \u00d7 Height (in) ] \u00f7 DIM divisor<\/strong>&nbsp;(139 for FedEx; 139 for UPS Daily Rates, 166 for UPS Retail Rates; 139 for USPS since July 12, 2026)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>FedEx:<\/strong>&nbsp;divide by 139 for U.S., Puerto Rico and international shipments, with each side rounded to the nearest whole inch (<a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/packaging\/what-is-dimensional-weight.html\"><u>FedEx<\/u><\/a>).<\/p>\n\n\n\n<p><strong>UPS:<\/strong>&nbsp;the divisor is 139 for Daily Rates and 166 for Retail Rates. Each side rounds to the nearest whole number, and any fraction of the result is increased to the next whole pound (<a href=\"https:\/\/www.ups.com\/us\/en\/support\/shipping-support\/shipping-dimensions-weight\"><u>UPS<\/u><\/a>).<\/p>\n\n\n\n<p><strong>USPS:<\/strong>&nbsp;since July 12, 2026 the divisor is 139 for Priority Mail Express, Priority Mail, USPS Ground Advantage and Parcel Select, and each side is rounded up to the next whole inch (<a href=\"https:\/\/www.federalregister.gov\/documents\/2026\/05\/15\/2026-09785\/domestic-competitive-products-pricing-and-mailing-standards-changes\"><u>Federal Register<\/u><\/a>). DIM weight applies only to packages larger than 1 cubic foot (1,728 cu. in.) (<a href=\"https:\/\/www.usps.com\/ship\/ground-advantage.htm\"><u>USPS<\/u><\/a>).<\/p>\n\n\n\n<p><strong>EU context:<\/strong>&nbsp;Ecoparcel notes that many courier services use a divisor of 5,000 or 6,000 cm\u00b3 per kg, depending on service and route (<a href=\"https:\/\/www.ecoparcel.eu\/en\/volumetric-weight\/\"><u>Ecoparcel<\/u><\/a>). By my arithmetic, 5,000 cm\u00b3\/kg is about 138.4 cu. in. per lb, close to the U.S. figure of 139.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"h_116\"><\/a><strong>The Financial Impact of Box Over-Sizing<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Take a 1.2 lb item in four container sizes. DIM weight is volume \u00f7 139, and the last column shows it as a multiple of actual weight.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Container Dimensions (L \u00d7 W \u00d7 H)<\/strong><\/td><td><strong>Actual Scale Weight<\/strong><\/td><td><strong>Calculated DIM Weight (Divisor 139)<\/strong><\/td><td><strong>Billable Weight (greater of actual and DIM)<\/strong><\/td><td><strong>DIM Weight \u00f7 Actual Weight<\/strong><\/td><\/tr><tr><td><strong>14\u2033 \u00d7 12\u2033 \u00d7 6\u2033 (Oversized Medium)<\/strong><\/td><td>1.2 lbs<\/td><td>7.25 lbs (1,008 \u00f7 139)<\/td><td>8 lbs (DIM, rounded up)<\/td><td>6.0\u00d7<\/td><\/tr><tr><td><strong>10\u2033 \u00d7 8\u2033 \u00d7 4\u2033 (Standard Small)<\/strong><\/td><td>1.2 lbs<\/td><td>2.30 lbs (320 \u00f7 139)<\/td><td>3 lbs (DIM, rounded up)<\/td><td>1.9\u00d7<\/td><\/tr><tr><td><strong>8\u2033 \u00d7 6\u2033 \u00d7 4\u2033 (Compact Small)<\/strong><\/td><td>1.2 lbs<\/td><td>1.38 lbs (192 \u00f7 139)<\/td><td>2 lbs (DIM, rounded up)<\/td><td>1.15\u00d7<\/td><\/tr><tr><td><strong>7\u2033 \u00d7 5\u2033 \u00d7 3\u2033 (Tight Fit)<\/strong><\/td><td>1.2 lbs<\/td><td>0.76 lbs (105 \u00f7 139)<\/td><td>1.2 lbs (actual weight governs)<\/td><td>0.63\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Key Logistics Takeaway:<\/strong>&nbsp;Moving a 1.2 lb item from a 14\u00d712\u00d76 in. box to an 8\u00d76\u00d74 in. box cuts DIM weight from 7.25 lbs to 1.38 lbs, so the billable weight falls from 8 lbs to 2 lbs. Below that point the item&#8217;s own weight governs, and a smaller box no longer changes the bill. One more caveat: at 1,008 cu. in., the 14\u00d712\u00d76 box is under the USPS 1-cubic-foot threshold, so USPS would not apply DIM weight to it at all.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"h_900\"><\/a><strong>Worked Examples From the Sources<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>These examples apply the published rules above. They are arithmetic, not client results or price estimates.<\/p>\n\n\n\n<p><strong>Example 1: a USPS package over the threshold.<\/strong>&nbsp;USPS rounds every fractional inch up and gives 12.2 in. becoming 13 in. as its own example (<a href=\"https:\/\/www.usps.com\/ship\/ground-advantage.htm\"><u>USPS<\/u><\/a>). A carton measuring 12.2 \u00d7 12.2 \u00d7 12.2 in. therefore counts as 13 \u00d7 13 \u00d7 13 = 2,197 cu. in. That is above 1,728, so DIM applies: 2,197 \u00f7 139 = 15.8, rounded up to 16 lbs. A 3 lb product in that carton is billed as 16 lbs.<\/p>\n\n\n\n<p><strong>Example 2: catalog size vs. outside size.<\/strong>&nbsp;The inside volume of a 12 \u00d7 9 \u00d7 6 in. box is 648 cu. in., or 4.66 lbs of DIM weight at 139. Its outside size is 12\u215c \u00d7 9\u215c \u00d7 6\u215d in., which rounds to 12 \u00d7 9 \u00d7 7 = 756 cu. in. and 756 \u00f7 139 = 5.44, so 6 lbs. That matches the 6 lbs Uline lists for the box (<a href=\"https:\/\/www.uline.com\/Product\/Detail\/S-18339\/Corrugated-Boxes-32-ECT\/12-x-9-x-6-Lightweight-32-ECT-Corrugated-Boxes\"><u>Uline<\/u><\/a>). Using the catalog size would understate the billable weight by a full pound.<\/p>\n\n\n\n<p><strong>Example 3: the divisor changes the answer.<\/strong>&nbsp;A 10 \u00d7 8 \u00d7 4 in. carton is 320 cu. in. At 139 (UPS Daily Rates) that is 2.30 lbs, billed as 3 lbs. At 166 (UPS Retail Rates) it is 1.93 lbs, billed as 2 lbs (<a href=\"https:\/\/www.ups.com\/us\/en\/support\/shipping-support\/shipping-dimensions-weight\"><u>UPS<\/u><\/a>). Same box, one pound apart, depending on the rate type.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_118\"><\/a><strong>6. Practical Decision Framework: Which Carrier Rule Applies to Your Package<\/strong><strong><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Situation<\/strong><\/td><td><strong>What the Carrier Rule Says<\/strong><\/td><td><strong>Source<\/strong><\/td><\/tr><tr><td><strong>Package over 50 lbs<\/strong><\/td><td>FedEx One Rate and UPS Simple Rate do not apply; standard rates based on dimensional weight and zone<\/td><td><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\">FedEx<\/a>,&nbsp;<a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>USPS package of 1,728 cu. in. or less<\/strong><\/td><td>DIM weight pricing applies only to packages larger than 1 cubic foot<\/td><td><a href=\"https:\/\/www.usps.com\/ship\/ground-advantage.htm\">USPS<\/a><\/td><\/tr><tr><td><strong>USPS package larger than 1,728 cu. in.<\/strong><\/td><td>Each side rounds up, volume \u00f7 139, and the greater of DIM weight and actual weight is paid<\/td><td><a href=\"https:\/\/www.usps.com\/ship\/ground-advantage.htm\">USPS<\/a>,&nbsp;<a href=\"https:\/\/www.federalregister.gov\/documents\/2026\/05\/15\/2026-09785\/domestic-competitive-products-pricing-and-mailing-standards-changes\">Federal Register<\/a><\/td><\/tr><tr><td><strong>Heavy item up to 70 lbs sent via USPS<\/strong><\/td><td>Priority Mail Flat Rate boxes and envelopes allow up to 70 lbs<\/td><td><a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\">USPS<\/a><\/td><\/tr><tr><td><strong>Package inside a UPS volume tier (up to 1,728 cu. in. and 50 lbs)<\/strong><\/td><td>Simple Rate prices by volume tier and speed, not weight or distance<\/td><td><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\">UPS<\/a><\/td><\/tr><tr><td><strong>Multi-item orders<\/strong><\/td><td>Every extra inch counts toward DIM weight, so the carton choice matters on every order. Cartonization software selects the smallest box that fits<\/td><td><a href=\"https:\/\/www.3dbinpacking.com\/en\/\">3DBinPacking<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"h_120\"><\/a><strong>7. Frequently Asked Questions (FAQ)<\/strong><strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>Q: How do you measure a box correctly?<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Box makers list inside dimensions as Length \u00d7 Width \u00d7 Height. Length is the longest side of the box that has a flap, width is the shorter side that has a flap, and height is the dimension without a flap and does not include the flaps (<a href=\"https:\/\/img.uline.com\/is\/content\/uline\/BoxGuide_ENUS_pdf\"><u>Uline Box Guide<\/u><\/a>). The packed carton is larger than the catalog size, so calculate DIM weight on outside measurements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>Which stock box sizes are available off the shelf?<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Uline alone lists&nbsp;<a href=\"https:\/\/www.uline.com\/Grp_9\/Corrugated-Boxes\"><u>over 1,700 stock sizes<\/u><\/a>, and all eight sizes in the reference table above are in its catalog. I did not find a reliable source that ranks box sizes by popularity, so choose sizes from your own order data.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>Is it cheaper to use carrier flat-rate boxes or your own boxes?<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>The published rules describe how each program prices, not which one is cheaper for you. USPS Priority Mail Flat Rate allows up to 70 lbs (<a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\"><u>USPS<\/u><\/a>). FedEx One Rate prices by packaging size, destination and speed up to 50 lbs (<a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\"><u>FedEx<\/u><\/a>). UPS Simple Rate prices by volume tier and speed up to 50 lbs and 1,728 cu. in. (<a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\"><u>UPS<\/u><\/a>). Standard rates depend on actual or DIM weight, so run both calculations on your own shipments before you switch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>Q: What is the difference between ECT 32 and 200 lb test boxes?<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>ECT measures edge crush strength, while 200# test measures burst resistance. Corrugated News lists 200# test as roughly equivalent to 32 ECT, and gives 65 lbs and 75 in. combined dimensions as the NMFC minimums for 32 ECT (<a href=\"https:\/\/www.corrugatednews.com\/blog\/understanding-board-grades\"><u>Corrugated News<\/u><\/a>). The weight limit refers to the packed box.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>Q: How does box sizing software (cartonization) work?<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Cartonization software takes 3D product dimensions, orientation rules and your available boxes, then chooses the smallest carton that fits every item in the order. A smaller carton means lower DIM weight.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"h_901\"><\/a><strong>Sources and Further Reading<\/strong><strong><\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pe.usps.com\/text\/dmm100\/flat-rate-reference.htm\"><u>USPS Postal Explorer: Flat Rate Quick Reference<\/u><\/a>: flat-rate dimensions and the 70 lb limit<\/li>\n\n\n\n<li><a href=\"https:\/\/www.usps.com\/ship\/ground-advantage.htm\"><u>USPS Ground Advantage<\/u><\/a>: 1 cubic foot DIM threshold, divisor 139, rounding up<\/li>\n\n\n\n<li><a href=\"https:\/\/www.federalregister.gov\/documents\/2026\/05\/15\/2026-09785\/domestic-competitive-products-pricing-and-mailing-standards-changes\"><u>Federal Register: USPS pricing and mailing standards changes<\/u><\/a>: divisor 139 and round-up rule, effective July 12, 2026<\/li>\n\n\n\n<li><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/packaging\/what-is-dimensional-weight.html\"><u>FedEx: What is Dimensional Weight?<\/u><\/a>: divisor 139, rounding<\/li>\n\n\n\n<li><a href=\"https:\/\/www.fedex.com\/en-us\/shipping\/one-rate.html\"><u>FedEx One Rate<\/u><\/a>: packaging dimensions and the 50 lb limit<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ups.com\/us\/en\/support\/shipping-support\/shipping-dimensions-weight\"><u>UPS: Shipping Dimensions and Weight<\/u><\/a>: divisors 139 (Daily) and 166 (Retail)<\/li>\n\n\n\n<li><a href=\"https:\/\/si.ups.com\/us\/en\/support\/shipping-support\/shipping-costs-rates\/flat-rate-shipping\"><u>UPS: Flat Rate Shipping<\/u><\/a>: Simple Rate tiers and limits<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uline.com\/CustomerService\/ULINE_FAQ_Ans?FAQ_ID=57\"><u>Uline: How do you measure a box?<\/u><\/a>&nbsp;and&nbsp;<a href=\"https:\/\/img.uline.com\/is\/content\/uline\/BoxGuide_ENUS_pdf\"><u>Box Guide<\/u><\/a>: inside dimensions, flap rules<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uline.com\/Grp_9\/Corrugated-Boxes\"><u>Uline corrugated box catalog<\/u><\/a>: stock sizes<\/li>\n\n\n\n<li><a href=\"https:\/\/www.corrugatednews.com\/blog\/understanding-board-grades\"><u>Corrugated News: Understanding Board Grades<\/u><\/a>: 32 ECT, 44 ECT, 200# test<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ecoparcel.eu\/en\/volumetric-weight\/\"><u>Ecoparcel: What is volumetric weight?<\/u><\/a>: European divisors 5,000 and 6,000<\/li>\n\n\n\n<li><a href=\"https:\/\/www.3dbinpacking.com\/en\/pricing\"><u>3DBinPacking pricing<\/u><\/a>: plans and free trial<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>Automate Your Box Selection &amp; Stop Paying DIM Penalties<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Picking boxes by hand means every order is a DIM calculation you do in your head. 3DBinPacking&#8217;s cartonization API integrates with your WMS or <a href=\"https:\/\/blog.3dbinpacking.com\/en\/q-commerce-the-ultra-fast-successor-to-e-commerce-3dbinpacking-blog\/\">e-commerce<\/a> store and selects the smallest box from your own list for each multi-item order. Plans start at $39 a month for 1,000 calculations, and the Small plan is $119 a month for 5,000 calculations (<a href=\"https:\/\/www.3dbinpacking.com\/en\/pricing\"><u>pricing<\/u><\/a>).&nbsp;<a href=\"https:\/\/www.3dbinpacking.com\/en\/register\/\"><u>Start a 14-day free trial<\/u><\/a>, no credit card required.<\/p>\n\n\n\n<p>Tom Mulawka, COO, <a href=\"https:\/\/blog.3dbinpacking.com\/en\/what-should-you-know-about-the-proposed-eu-packaging-directive\/\">3DBinPacking<\/a>.com<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A reference for corrugated box sizes, carrier flat-rate packaging and the dimensional (DIM) weight rules that turn an oversized box into a bigger invoice. Every figure links to the carrier, USPS or box-maker page it comes from. Sources checked November 13, 2026. L \u00d7 W \u00d7 HINSIDE DIMENSIONS: HOW BOX MAKERS LIST SIZES 139DIM DIVISOR: &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/blog.3dbinpacking.com\/en\/standard-shipping-box-sizes\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Standard Shipping &amp; Packing Box Sizes: Complete Dimensions Reference&#8221;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,15],"tags":[],"class_list":["post-3287","post","type-post","status-publish","format-standard","hentry","category-3dbp-hints","category-wysylka"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Box Sizes Chart &amp; DIM Weight Rules (2026)<\/title>\n<meta name=\"description\" content=\"Standard shipping box sizes with USPS, UPS and FedEx flat-rate dimensions and DIM weight rules for 2026. Every figure linked to its source.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.3dbinpacking.com\/en\/standard-shipping-box-sizes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Box Sizes Chart &amp; DIM Weight Rules (2026)\" \/>\n<meta property=\"og:description\" content=\"Standard shipping box sizes with USPS, UPS and FedEx flat-rate dimensions and DIM weight rules for 2026. 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