{"id":211,"date":"2018-06-06T02:47:05","date_gmt":"2018-06-06T02:47:05","guid":{"rendered":"https:\/\/www.qinprinting.com\/blog\/?p=211"},"modified":"2026-01-08T16:21:33","modified_gmt":"2026-01-08T08:21:33","slug":"common-paper-weights-lb-to-gsm-conversions","status":"publish","type":"post","link":"https:\/\/www.qinprinting.com\/blog\/common-paper-weights-lb-to-gsm-conversions\/","title":{"rendered":"Common Paper Weights: LB To GSM Conversions"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"211\" class=\"elementor elementor-211\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-49b029b e-flex e-con-boxed e-con e-parent\" data-id=\"49b029b\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4788285 elementor-widget elementor-widget-text-editor\" data-id=\"4788285\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size: 18px;\"><div class=\"boldgrid-section\"><div class=\"container\"><div class=\"row\"><div class=\"col-md-12 col-xs-12 col-sm-12\"><p>We often say that there&#8217;s no border of knowledge in the world, but the carrier of knowledge \u2013paper is different.<\/p><p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-45757\" src=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2018\/10\/Which-paper-should-I-choose-for-my-printing-project-2.jpg\" alt=\"Which paper should I choose for my printing project?\" width=\"1000\" height=\"574\" srcset=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2018\/10\/Which-paper-should-I-choose-for-my-printing-project-2.jpg 1000w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2018\/10\/Which-paper-should-I-choose-for-my-printing-project-2-500x287.jpg 500w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2018\/10\/Which-paper-should-I-choose-for-my-printing-project-2-100x57.jpg 100w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2018\/10\/Which-paper-should-I-choose-for-my-printing-project-2-768x441.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p class=\"\">When we need to custom printing a <a href=\"https:\/\/www.qinprinting.com\/hardcover-book-printing\/\">hardcover book<\/a>, a booklet that promotes the company or a personalized poster to a foreign company, we&#8217;re going to have a problem, I use &#8220;LB&#8221; to describe paper, but the other uses &#8220;GSM&#8221;. How should we convert paper weights?<\/p><p class=\"\">Before answering this question, we need to know what is <a href=\"https:\/\/www.qinprinting.com\/paper-weight-conversion-gsm-to-lbs\/\">&#8220;LB&#8221; and &#8220;GSM&#8221;<\/a> first.<\/p><p class=\"\">In China, the paper quantitation is called &#8220;gram weight&#8221;, it commonly uses GSM\u00a0to represent, meaning the grams per square meter of paper.\u00a0But the United States and the United Kingdom adopt the British system and weigh paper in pound (LB), it means the pounds per piece of paper.<\/p><p class=\"\">And here comes some formulas to be used,<\/p><ul class=\"\"><li>one ream paper = 500 piece paper<\/li><li>one inch = 2.54cm<\/li><li>one pound = 453.6g<\/li><li>one GSM= the weight of one square meter paper<\/li><li>one LB= the weight of one ream paper = the weight of 500 pieces paper<\/li><\/ul><p class=\"\">Now we give an example with text paper. This paper is 25*38 inch. It is 25*0.0254*38*0.0254=0.6129 m<sup>2<\/sup>,so the size of 500 pieces paper is 500*0.6129\u00a0=\u00a0304.65m<sup>2<\/sup>.<\/p><p class=\"\">We assume that the weight of this paper is 1g per square meters. Then 500 pieces are 304.65g, it is also 304.65\/453.6\u00a0=\u00a00.676\u00a0pounds. So\u00a0for 25*38 inch text paper, 1\u00a0GSM =\u00a00.676 LB<\/p><p class=\"\">Make a conclusion, <strong><b>LB = GSM*length(m) * width(m) * 500 \/ 453.6<\/b><\/strong><\/p><p class=\"\">Is it a lot simpler? But it&#8217;s not over yet. From the above formula, we can see that the factor\u00a0of the two units is related to the size of paper, but the size of paper is various\u00a0in the world, so the number of the conversion is also different. Next, I will focus on three\u00a0kinds of common American paper.<\/p><h2><span style=\"color: #000000;\">Writing papers<\/span><\/h2><p class=\"\"><img decoding=\"async\" class=\"alignnone wp-image-975 size-full\" src=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/manual-printing.jpg\" alt=\"manual printing\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/manual-printing.jpg 600w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/manual-printing-500x333.jpg 500w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/manual-printing-100x67.jpg 100w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><p class=\"\" style=\"text-align: left;\">Writing papers are generally used for letterhead and communication systems, but can also be used for advertising flyers\u00a0printing, reports printing or any other project where a lightweight paper is appropriate.\u00a0The size of this paper is 17 *22 inch.<\/p><h2><span style=\"color: #000000;\">Text papers<\/span><\/h2><p class=\"\"><img decoding=\"async\" class=\"alignnone wp-image-973 size-full\" src=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/book-printing-service.jpg\" alt=\"book printing service\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/book-printing-service.jpg 600w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/book-printing-service-500x333.jpg 500w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2019\/01\/book-printing-service-100x67.jpg 100w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><p class=\"\">Text papers are classified\u00a0into offset paper or coated paper in China, it is\u00a0typically used for the inside pages of books\u00a0printing, brochures\u00a0printing, and catalogue printing. The weight of text papers also lends itself to advertising flyers printing as well as letterhead and communication systems.\u00a0The size of this paper is 25*38 inch.<\/p><h2><span style=\"color: #000000;\">Cover papers<\/span><\/h2><p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7712 size-full\" src=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2024\/04\/How-to-choose-between-paperback-and-hardcover.jpg\" alt=\"How to choose between paperback and hardcover\" width=\"800\" height=\"459\" srcset=\"https:\/\/www.qinprinting.com\/wp-content\/uploads\/2024\/04\/How-to-choose-between-paperback-and-hardcover.jpg 800w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2024\/04\/How-to-choose-between-paperback-and-hardcover-500x287.jpg 500w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2024\/04\/How-to-choose-between-paperback-and-hardcover-100x57.jpg 100w, https:\/\/www.qinprinting.com\/wp-content\/uploads\/2024\/04\/How-to-choose-between-paperback-and-hardcover-768x441.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p><p class=\"\">Cover papers are also called C1S papers. It is\u00a0heavier than text sheets and is generally used for the covers of hardcover books printing and folders printing where extra bulk and protection are needed. Other cover paper uses include calendars\u00a0printing, menus\u00a0printing, invitations and thanks cards printing. \u00a0The size of this paper is 20*36 inch.<\/p><p class=\"\">The sizes of these three kinds of paper are different, so the factor of their LB and GSM are different. Is it a bit confusing?\u00a0Don&#8217;t worry,\u00a0I\u00a0list\u00a0a form\u00a0for you.<\/p><table><tbody><tr><td colspan=\"2\" width=\"143\">Writing paper<\/td><td rowspan=\"11\" width=\"15\">\u00a0<\/td><td colspan=\"2\" width=\"143\">Text paper<\/td><td rowspan=\"11\" width=\"15\">\u00a0<\/td><td colspan=\"2\" width=\"143\">Cover paper<\/td><\/tr><tr><td colspan=\"2\" width=\"143\">Factor = 3.760<\/td><td colspan=\"2\" width=\"143\">Factor = 1.480<\/td><td colspan=\"2\" width=\"143\">Factor = 1.480<\/td><\/tr><tr><td width=\"71\">LB<\/td><td width=\"71\">GSM<\/td><td width=\"71\">LB<\/td><td width=\"71\">GSM<\/td><td width=\"71\">LB<\/td><td width=\"71\">GSM<\/td><\/tr><tr><td width=\"71\">16<\/td><td width=\"71\">60<\/td><td width=\"71\">45<\/td><td width=\"71\">67<\/td><td width=\"71\">40<\/td><td width=\"71\">108<\/td><\/tr><tr><td width=\"71\">17<\/td><td width=\"71\">64<\/td><td width=\"71\">50<\/td><td width=\"71\">74<\/td><td width=\"71\">50<\/td><td width=\"71\">135<\/td><\/tr><tr><td width=\"71\">20<\/td><td width=\"71\">75<\/td><td width=\"71\">60<\/td><td width=\"71\">89<\/td><td width=\"71\">60<\/td><td width=\"71\">162<\/td><\/tr><tr><td width=\"71\">24<\/td><td width=\"71\">90<\/td><td width=\"71\">70<\/td><td width=\"71\">104<\/td><td width=\"71\">65<\/td><td width=\"71\">176<\/td><\/tr><tr><td width=\"71\">28<\/td><td width=\"71\">105<\/td><td width=\"71\">80<\/td><td width=\"71\">118<\/td><td width=\"71\">80<\/td><td width=\"71\">216<\/td><\/tr><tr><td width=\"71\">31<\/td><td width=\"71\">117<\/td><td width=\"71\">90<\/td><td width=\"71\">133<\/td><td width=\"71\">90<\/td><td width=\"71\">250<\/td><\/tr><tr><td width=\"71\">32<\/td><td width=\"71\">120<\/td><td width=\"71\">100<\/td><td width=\"71\">148<\/td><td width=\"71\">100<\/td><td width=\"71\">270<\/td><\/tr><tr><td width=\"71\">36<\/td><td width=\"71\">135<\/td><td width=\"71\">120<\/td><td width=\"71\">178<\/td><td width=\"71\">105<\/td><td width=\"71\">284<\/td><\/tr><\/tbody><\/table><p class=\"\">Do you have any question about the paper? Please <a href=\"https:\/\/www.qinprinting.com\/contact-us\/\">contact us<\/a> right now.<\/p><\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>We often say that there's no border of knowledge in the world, but the carrier of knowledge \u2013paper is different. When we need to custom printing a hardcover book, a booklet that promotes the company or a personalized poster to a foreign company, we're going to have a problem, I use \"LB\" to describe paper, [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":45757,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[77],"tags":[],"class_list":["post-211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-printing-guide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Common Paper Weights: LB To GSM Conversions - QinPrinting<\/title>\n<meta name=\"description\" content=\"We often say that there&#039;s no border of knowledge\u00a0in the world, but the carrier of knowledge \u2013paper is different. 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