{"id":2155,"date":"2024-08-07T15:01:25","date_gmt":"2024-08-07T07:01:25","guid":{"rendered":"http:\/\/www.bestpcbs.com\/blog\/?p=2155"},"modified":"2024-08-07T15:09:19","modified_gmt":"2024-08-07T07:09:19","slug":"the-origin-of-inches-and-how-to-convert-millimeters-to-inches","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2024\/08\/the-origin-of-inches-and-how-to-convert-millimeters-to-inches\/","title":{"rendered":"The origin of inches and how to convert millimeters to inches"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/08\/the-origin-of-inches-and-how-to-convert-millimeters-to-inches\/#Inches_to_MM_conversion\" >Inches to MM conversion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/08\/the-origin-of-inches-and-how-to-convert-millimeters-to-inches\/#Origin_of_the_inch\" >Origin of the inch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/08\/the-origin-of-inches-and-how-to-convert-millimeters-to-inches\/#mm_or_inches_in_the_PCB_industry\" >mm or inches in the PCB industry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/08\/the-origin-of-inches-and-how-to-convert-millimeters-to-inches\/#PCB_package_size\" >PCB package size<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inches_to_MM_conversion\"><\/span>Inches to MM conversion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In the imperial system, 12 inches is 1 foot, and 36 inches is 1 yard.<br>1mil=1\/1000inch=0.00254cm=0.0254mm.<br>1inch=2.54cm=25.4mm=1000mil<br>1 inch=2.54cm=25.4mm.<\/p>\n\n\n\n<p><strong>10 mm = 0.393700787 inches<br>50 mm =1.96850394 inches<\/strong><br><\/p>\n\n\n\n<p><strong>1400mm in inches<\/strong><br>1400 mm = 55.1181102 inches<\/p>\n\n\n\n<p><strong>1500 mm to inches<\/strong><br>1500 mm = 59.0551181 inches<\/p>\n\n\n\n<p><strong>1800mm to inches<\/strong><br>1800 mm =70.8661417 inches<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Origin_of_the_inch\"><\/span>Origin of the inch<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The word &#8220;inch&#8221; comes from the Old English word &#8220;ynce&#8221;, which comes from the Latin word &#8220;uncia&#8221; (meaning &#8220;one twelfth&#8221;).<br>In the 14th century, King Edward II of England promulgated the &#8220;standard legal inch&#8221;; its regulations were: the length of the three largest grains of wheat selected from the middle of the barley ear and placed end to end in a row is 1 inch.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/08\/\u5fae\u4fe1\u622a\u56fe_20240807144759.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"599\" height=\"400\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/08\/\u5fae\u4fe1\u622a\u56fe_20240807144759.jpg\" alt=\"\" class=\"wp-image-2156\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/08\/\u5fae\u4fe1\u622a\u56fe_20240807144759.jpg 599w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/08\/\u5fae\u4fe1\u622a\u56fe_20240807144759-300x200.jpg 300w\" sizes=\"auto, (max-width: 599px) 100vw, 599px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"mm_or_inches_in_the_PCB_industry\"><\/span>mm or inches in the PCB industry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(including the substrate and all copper layers, solder mask and silk screen), either millimeters or inches can be used as units. However, 1.6 mm is not the only choice, and the thickness of the PCB can vary depending on the specific application, ranging from 0.3 mm to 4.0 mm1.<br>In PCB design, for design and layout units such as traces, pads, spacing and grids, the imperial unit &#8220;thou&#8221; (one thousandth of an inch) should be used instead of millimeters. For mechanical manufacturing unit requirements such as apertures and PCB board sizes, millimeters can be used. This shows that when designing PCBs, you need to be familiar with the conversion relationship between the imperial unit &#8220;thou&#8221; and the metric unit millimeter. \u200c<br>In summary, the units used in the PCB industry depend on the specific application scenarios and requirements. When describing the thickness of the PCB board, millimeters or inches can be used as units, while in design and layout, the imperial unit &#8220;thou&#8221; should be used to adapt to design requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_package_size\"><\/span>PCB package size<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>PCB length units usually refer to the shortest distance between components on the PCB. Common length units are inches, centimeters and millimeters. For example, the minimum PCB length unit for the 0805 package size is 1 inch, while the minimum PCB length unit for the 0402 package size is 0.25 inches. In addition, there are some other commonly used PCB package sizes, such as 0101 package size, 0201 package size, 0302 package size, etc.<\/p>\n\n\n\n<p>PCB package size is a standard size for mounting and connecting electronic components on PCBs. The following are the most commonly used device PCB package sizes:<br>1.0805 package size: This package size is used for electronic components of 8 inches (about 20 cm) in size, including transistors, capacitors, inductors and other small components.<br>2.0402 package size: This package size is used for electronic components with a size of 4 inches (about 10 cm), including transistors, capacitors, inductors and small components.<br>3.0603 package size: This package size is used for electronic components with a size of 6 inches (about 15 cm), including transistors, capacitors, inductors and small components.<br>4.1206 package size: This package size is used for electronic components with a size of 12 inches (about 30 cm), including transistors, capacitors, inductors and small components.<\/p>\n\n\n\n<p>The unit of PCB length is usually millimeter (mm) or inch (inch), while the unit of copper foil thickness is OZ (ounce), which is about 35um or 1.35mil. When designing the PCB of the op amp circuit, factors such as layout, wiring, power decoupling, and heat dissipation design need to be considered to ensure signal integrity and stability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Inches to MM conversion In the imperial system, 12 inches is 1 foot, and 36 inches is 1 yard.1mil=1\/1000inch=0.00254cm=0.0254mm.1inch=2.54cm=25.4mm=1000mil1 inch=2.54cm=25.4mm. 10 mm = 0.393700787 inches50 mm =1.96850394 inches 1400mm in inches1400 mm = 55.1181102 inches 1500 mm to inches1500 mm = 59.0551181 inches 1800mm to inches1800 mm =70.8661417 inches Origin of the inch The word [&hellip;]<\/p>\n","protected":false},"author":623,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[175,174],"tags":[23],"class_list":["post-2155","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-bestpcb","tag-pcb"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/2155","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/users\/623"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/comments?post=2155"}],"version-history":[{"count":5,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/2155\/revisions"}],"predecessor-version":[{"id":2163,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/2155\/revisions\/2163"}],"wp:attachment":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/media?parent=2155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/categories?post=2155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/tags?post=2155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}