{"id":180561,"date":"2026-10-01T14:42:58","date_gmt":"2026-10-01T12:42:58","guid":{"rendered":"https:\/\/stalesia.com\/dn-calculator\/"},"modified":"2026-10-01T14:42:58","modified_gmt":"2026-10-01T12:42:58","slug":"dn-calculator","status":"publish","type":"page","link":"https:\/\/stalesia.com\/en\/dn-calculator\/","title":{"rendered":"Pipe Size Calculator \u2013 DN, Inches and Millimetres"},"content":{"rendered":"        <div id=\"kdn-calculator\" class=\"kdn-calculator\">\n\n            <!-- STEP 1: Source unit tabs -->\n            <div class=\"kdn-step\">\n                <div class=\"kdn-step-header\">\n                    <span class=\"kdn-step-num\">1<\/span>\n                    <div class=\"kdn-step-title\">\n                        <strong>Diameter converter<\/strong>\n                        <span class=\"kdn-step-subtitle\">Select source unit and value<\/span>\n                    <\/div>\n                <\/div>\n                <div class=\"kdn-step-body\">\n                    <div class=\"kdn-tabs-nav\" role=\"tablist\">\n                        <button class=\"kdn-tab-btn kdn-active\" data-tab=\"dn\" role=\"tab\" aria-selected=\"true\">DN<\/button>\n                        <button class=\"kdn-tab-btn\" data-tab=\"inch\" role=\"tab\" aria-selected=\"false\">Inches<\/button>\n                        <button class=\"kdn-tab-btn\" data-tab=\"od\" role=\"tab\" aria-selected=\"false\">OD EN (mm)<\/button>\n                    <\/div>\n\n                    <div class=\"kdn-field-group\">\n                        <label for=\"kdn-value\">Select value<\/label>\n                        <select id=\"kdn-value\">\n                            <option value=\"\">\u2014<\/option>\n                                                            <option value=\"0\">DN6<\/option>\n                                                            <option value=\"1\">DN8<\/option>\n                                                            <option value=\"2\">DN10<\/option>\n                                                            <option value=\"3\">DN15<\/option>\n                                                            <option value=\"4\">DN20<\/option>\n                                                            <option value=\"5\">DN25<\/option>\n                                                            <option value=\"6\">DN32<\/option>\n                                                            <option value=\"7\">DN40<\/option>\n                                                            <option value=\"8\">DN50<\/option>\n                                                            <option value=\"9\">DN65<\/option>\n                                                            <option value=\"10\">DN80<\/option>\n                                                            <option value=\"11\">DN90<\/option>\n                                                            <option value=\"12\">DN100<\/option>\n                                                            <option value=\"13\">DN125<\/option>\n                                                            <option value=\"14\">DN150<\/option>\n                                                            <option value=\"15\">DN200<\/option>\n                                                            <option value=\"16\">DN250<\/option>\n                                                            <option value=\"17\">DN300<\/option>\n                                                            <option value=\"18\">DN350<\/option>\n                                                            <option value=\"19\">DN400<\/option>\n                                                            <option value=\"20\">DN450<\/option>\n                                                            <option value=\"21\">DN500<\/option>\n                                                            <option value=\"22\">DN600<\/option>\n                                                            <option value=\"23\">DN700<\/option>\n                                                            <option value=\"24\">DN750<\/option>\n                                                            <option value=\"25\">DN800<\/option>\n                                                            <option value=\"26\">DN900<\/option>\n                                                            <option value=\"27\">DN1000<\/option>\n                                                            <option value=\"28\">DN1200<\/option>\n                                                            <option value=\"29\">DN1400<\/option>\n                                                            <option value=\"30\">DN1600<\/option>\n                                                            <option value=\"31\">DN1800<\/option>\n                                                    <\/select>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n            <!-- RESULTS -->\n            <div class=\"kdn-results kdn-hidden\" id=\"kdn-results\">\n                <div class=\"kdn-result-card\">\n                    <div class=\"kdn-result-label\">Nominal diameter<\/div>\n                    <div class=\"kdn-result-value\" id=\"kdn-res-dn\">&mdash;<\/div>\n                <\/div>\n                <div class=\"kdn-result-card\">\n                    <div class=\"kdn-result-label\">Inches<\/div>\n                    <div class=\"kdn-result-value\" id=\"kdn-res-inch\">&mdash;<\/div>\n                    <div class=\"kdn-result-unit\">in<\/div>\n                <\/div>\n                <div class=\"kdn-result-card\">\n                    <div class=\"kdn-result-label\">Outside diameter OD (EN)<\/div>\n                    <div class=\"kdn-result-value\" id=\"kdn-res-od\">&mdash;<\/div>\n                    <div class=\"kdn-result-unit\">mm<\/div>\n                <\/div>\n                <div class=\"kdn-result-card\">\n                    <div class=\"kdn-result-label\">Outside diameter OD (ASME)<\/div>\n                    <div class=\"kdn-result-value\" id=\"kdn-res-od-asme\">&mdash;<\/div>\n                    <div class=\"kdn-result-unit\">mm<\/div>\n                <\/div>\n                <div class=\"kdn-result-card\">\n                    <div class=\"kdn-result-label\">Wall thickness Sch 40<\/div>\n                    <div class=\"kdn-result-value\" id=\"kdn-res-wt\">&mdash;<\/div>\n                    <div class=\"kdn-result-unit\">mm<\/div>\n                <\/div>\n                <div class=\"kdn-result-card\">\n                    <div class=\"kdn-result-label\">Inside diameter ID (ASME)<\/div>\n                    <div class=\"kdn-result-value\" id=\"kdn-res-id\">&mdash;<\/div>\n                    <div class=\"kdn-result-unit\">mm<\/div>\n                <\/div>\n            <\/div>\n\n            <!-- FULL TABLE -->\n            <div class=\"kdn-step kdn-table-section\">\n                <div class=\"kdn-step-header kdn-table-toggle\" style=\"cursor:pointer;\">\n                    <span class=\"kdn-step-num\">\n                        <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M3 3h18v18H3z\"\/><path d=\"M3 9h18\"\/><path d=\"M3 15h18\"\/><path d=\"M9 3v18\"\/><\/svg>\n                    <\/span>\n                    <div class=\"kdn-step-title\">\n                        <strong>DN conversion table<\/strong>\n                    <\/div>\n                    <span class=\"kdn-chevron\">&#9662;<\/span>\n                <\/div>\n                <div class=\"kdn-step-body kdn-table-body kdn-hidden\">\n                    <div class=\"kdn-table-wrap\">\n                        <table class=\"kdn-table\">\n                            <thead>\n                                <tr>\n                                    <th>DN<\/th>\n                                    <th>Inches<\/th>\n                                    <th>OD EN (mm)<\/th>\n                                    <th>OD ASME (mm)<\/th>\n                                    <th>WT Sch 40 (mm)<\/th>\n                                    <th>ID (mm)<\/th>\n                                <\/tr>\n                            <\/thead>\n                            <tbody>\n                                                                    <tr>\n                                        <td><strong>DN6<\/strong><\/td>\n                                        <td>1\/8\"<\/td>\n                                        <td>10.2<\/td>\n                                        <td>10.3<\/td>\n                                        <td>1.73<\/td>\n                                        <td>6.8<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN8<\/strong><\/td>\n                                        <td>1\/4\"<\/td>\n                                        <td>13.5<\/td>\n                                        <td>13.7<\/td>\n                                        <td>2.24<\/td>\n                                        <td>9.2<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN10<\/strong><\/td>\n                                        <td>3\/8\"<\/td>\n                                        <td>17.2<\/td>\n                                        <td>17.1<\/td>\n                                        <td>2.31<\/td>\n                                        <td>12.5<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN15<\/strong><\/td>\n                                        <td>1\/2\"<\/td>\n                                        <td>21.3<\/td>\n                                        <td>21.3<\/td>\n                                        <td>2.77<\/td>\n                                        <td>15.8<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN20<\/strong><\/td>\n                                        <td>3\/4\"<\/td>\n                                        <td>26.9<\/td>\n                                        <td>26.7<\/td>\n                                        <td>2.87<\/td>\n                                        <td>21<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN25<\/strong><\/td>\n                                        <td>1\"<\/td>\n                                        <td>33.7<\/td>\n                                        <td>33.4<\/td>\n                                        <td>3.38<\/td>\n                                        <td>26.6<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN32<\/strong><\/td>\n                                        <td>1 1\/4\"<\/td>\n                                        <td>42.4<\/td>\n                                        <td>42.2<\/td>\n                                        <td>3.56<\/td>\n                                        <td>35.1<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN40<\/strong><\/td>\n                                        <td>1 1\/2\"<\/td>\n                                        <td>48.3<\/td>\n                                        <td>48.3<\/td>\n                                        <td>3.68<\/td>\n                                        <td>40.9<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN50<\/strong><\/td>\n                                        <td>2\"<\/td>\n                                        <td>60.3<\/td>\n                                        <td>60.3<\/td>\n                                        <td>3.91<\/td>\n                                        <td>52.5<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN65<\/strong><\/td>\n                                        <td>2 1\/2\"<\/td>\n                                        <td>76.1<\/td>\n                                        <td>73<\/td>\n                                        <td>5.16<\/td>\n                                        <td>62.7<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN80<\/strong><\/td>\n                                        <td>3\"<\/td>\n                                        <td>88.9<\/td>\n                                        <td>88.9<\/td>\n                                        <td>5.49<\/td>\n                                        <td>77.9<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN90<\/strong><\/td>\n                                        <td>3 1\/2\"<\/td>\n                                        <td>101.6<\/td>\n                                        <td>101.6<\/td>\n                                        <td>5.74<\/td>\n                                        <td>90.1<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN100<\/strong><\/td>\n                                        <td>4\"<\/td>\n                                        <td>114.3<\/td>\n                                        <td>114.3<\/td>\n                                        <td>6.02<\/td>\n                                        <td>102.3<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN125<\/strong><\/td>\n                                        <td>5\"<\/td>\n                                        <td>139.7<\/td>\n                                        <td>141.3<\/td>\n                                        <td>6.55<\/td>\n                                        <td>128.2<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN150<\/strong><\/td>\n                                        <td>6\"<\/td>\n                                        <td>168.3<\/td>\n                                        <td>168.3<\/td>\n                                        <td>7.11<\/td>\n                                        <td>154.1<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN200<\/strong><\/td>\n                                        <td>8\"<\/td>\n                                        <td>219.1<\/td>\n                                        <td>219.1<\/td>\n                                        <td>8.18<\/td>\n                                        <td>202.7<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN250<\/strong><\/td>\n                                        <td>10\"<\/td>\n                                        <td>273<\/td>\n                                        <td>273.1<\/td>\n                                        <td>9.27<\/td>\n                                        <td>254.6<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN300<\/strong><\/td>\n                                        <td>12\"<\/td>\n                                        <td>323.9<\/td>\n                                        <td>323.8<\/td>\n                                        <td>10.31<\/td>\n                                        <td>303.2<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN350<\/strong><\/td>\n                                        <td>14\"<\/td>\n                                        <td>355.6<\/td>\n                                        <td>355.6<\/td>\n                                        <td>11.13<\/td>\n                                        <td>333.3<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN400<\/strong><\/td>\n                                        <td>16\"<\/td>\n                                        <td>406.4<\/td>\n                                        <td>406.4<\/td>\n                                        <td>12.7<\/td>\n                                        <td>381<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN450<\/strong><\/td>\n                                        <td>18\"<\/td>\n                                        <td>457<\/td>\n                                        <td>457<\/td>\n                                        <td>14.27<\/td>\n                                        <td>428.5<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN500<\/strong><\/td>\n                                        <td>20\"<\/td>\n                                        <td>508<\/td>\n                                        <td>508<\/td>\n                                        <td>15.09<\/td>\n                                        <td>477.8<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN600<\/strong><\/td>\n                                        <td>24\"<\/td>\n                                        <td>610<\/td>\n                                        <td>610<\/td>\n                                        <td>17.48<\/td>\n                                        <td>575<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN700<\/strong><\/td>\n                                        <td>28\"<\/td>\n                                        <td>711<\/td>\n                                        <td>711<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN750<\/strong><\/td>\n                                        <td>30\"<\/td>\n                                        <td>762<\/td>\n                                        <td>762<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN800<\/strong><\/td>\n                                        <td>32\"<\/td>\n                                        <td>813<\/td>\n                                        <td>813<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN900<\/strong><\/td>\n                                        <td>36\"<\/td>\n                                        <td>914<\/td>\n                                        <td>914<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN1000<\/strong><\/td>\n                                        <td>40\"<\/td>\n                                        <td>1,016<\/td>\n                                        <td>1,016<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN1200<\/strong><\/td>\n                                        <td>48\"<\/td>\n                                        <td>1,219<\/td>\n                                        <td>1,219<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN1400<\/strong><\/td>\n                                        <td>56\"<\/td>\n                                        <td>1,422<\/td>\n                                        <td>1,422<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN1600<\/strong><\/td>\n                                        <td>64\"<\/td>\n                                        <td>1,626<\/td>\n                                        <td>1,626<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                                    <tr>\n                                        <td><strong>DN1800<\/strong><\/td>\n                                        <td>72\"<\/td>\n                                        <td>1,829<\/td>\n                                        <td>1,829<\/td>\n                                        <td>\u2014<\/td>\n                                        <td>\u2014<\/td>\n                                    <\/tr>\n                                                            <\/tbody>\n                        <\/table>\n                    <\/div>\n                    <p class=\"kdn-note\">OD EN \u2014 metric pipes per EN 10220 \/ EN ISO 1127. OD ASME, Sch 40 wall and inside diameter \u2014 inch pipes per ASME B36.10M \/ B36.19M (up to NPS 10 Sch 40S has the same wall). Approximate values.<\/p>\n                <\/div>\n            <\/div>\n\n            \n        <\/div>\n        \n\n\n\n<h2 class=\"wp-block-heading\">DN is a label, not a measurement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DN (nominal diameter) identifies a size class. It does not give you millimetres. A DN50 pipe is not 50 mm across \u2013 the real outside diameter depends on the standard the pipe was made to, and that is the number that decides whether a fitting slides on.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why one DN gives several diameters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In our own stock, DN25 turns up as 33.7, 33.4, 32, 31.8 and 30 mm. The split runs between the European series (EN 10220, EN ISO 1127) and the American one (ASME B36.10M, B36.19M). DN65 is the clearest case: <strong>76.1 mm to EN, 73.0 mm to ASME<\/strong>. Three millimetres decide whether the joint closes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The calculator above returns both, so you can match whichever series your drawing refers to instead of guessing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OD, WT and ID<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>OD<\/strong>\u2013 outside diameter. The figure that decides whether a fitting, flange or clamp fits.<\/li>\n<li><strong>WT<\/strong>\u2013 wall thickness, usually given as a schedule (Sch 10S, Sch 40S). The same DN in a heavier schedule keeps its OD and loses bore.<\/li>\n<li><strong>ID<\/strong>\u2013 inside diameter: OD minus twice the wall. This is what actually carries the flow, and it is the number a pressure-drop calculation needs.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Ordering from us<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Give us the DN and the standard, or simply the outside diameter and wall in millimetres \u2013 either is enough. If your drawing quotes inches, the calculator converts it. Everything we list is stainless: acid-resistant, heat-resistant, duplex and the austenitic grades.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DN is a label, not a measurement DN (nominal diameter) identifies a size class. It does not give you millimetres. A DN50 pipe is not 50 mm across \u2013 the real outside diameter depends on the standard the pipe was made to, and that is the number that decides whether a fitting slides on. Why [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-180561","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pipe Size Calculator \u2013 DN to inches and mm - Stalesia<\/title>\n<meta name=\"description\" content=\"Convert DN to inches, outside diameter and wall thickness. 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