{"id":100177,"date":"2026-02-15T20:25:15","date_gmt":"2026-02-15T20:25:15","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100177"},"modified":"2026-07-13T01:09:54","modified_gmt":"2026-07-13T01:09:54","slug":"oil-viscosity-class-iso3448","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sk\/calculators\/oil-viscosity-class-iso3448\/","title":{"rendered":"ISO VG Band Lookup at 40 \u00b0C"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"ISO VG Band Lookup at 40 \u00b0C\",\"description\":\"Checks a documented kinematic-viscosity value at 40 \u00b0C against the publicly corroborated ISO VG bands without assigning gap values to a nearest grade.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/oil-viscosity-class-iso3448\/\",\"applicationCategory\":\"EngineeringApplication\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2026-07-13\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true,\"featureList\":[\"Twenty ISO VG designations\",\"Exact low-grade midpoints\",\"Gap detection\",\"Source and method gate\"],\"keywords\":\"ISO 3448,ISO VG,kinematic viscosity,40 degrees Celsius,viscosity band\"}<\/script>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does every positive viscosity belong to an ISO VG band?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The bands have gaps. A value outside every listed interval must not be assigned to the nearest grade as if it conformed.\"}},{\"@type\":\"Question\",\"name\":\"Is the number always the exact midpoint?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The exact midpoints for VG 2, 3, 5 and 7 are 2.2, 3.2, 4.6 and 6.8 mm\u00b2\/s respectively.\"}},{\"@type\":\"Question\",\"name\":\"Does ISO VG select a lubricant for my machine?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It classifies kinematic viscosity at 40 \u00b0C; it does not establish performance, chemistry, operating-temperature suitability or OEM approval.\"}},{\"@type\":\"Question\",\"name\":\"Is cSt the same as mm\u00b2\/s?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. One centistoke equals one square millimetre per second.\"}}]}<\/script>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"ISO VG Band Lookup at 40 \u00b0C\",\"item\":\"https:\/\/vibromera.eu\/calculators\/oil-viscosity-class-iso3448\/\"}]}<\/script>\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\"><link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin><link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:wght@400;500;600;700&#038;family=JetBrains+Mono:wght@400;500;600&#038;family=Fraunces:opsz,wght@9..144,700;9..144,800&#038;display=swap\" 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var(--y);color:var(--is)}.vc-table-wrap{overflow-x:auto;margin-top:14px}.vc-table{width:100%;border-collapse:collapse;font-size:13px}.vc-table th,.vc-table td{padding:9px 11px;border:1px solid var(--bl);text-align:right}.vc-table th:first-child,.vc-table td:first-child{text-align:left}.vc-table th{background:var(--sa);font-size:11px;text-transform:uppercase}.vc-table tr.vc-highlight{background:var(--al)}.vc-faq-item{border:1px solid var(--bl);margin-top:8px}.vc-faq-q{width:100%;padding:14px;border:0;background:var(--sa);text-align:left;font-weight:600}.vc-faq-a{display:none;padding:14px;color:var(--is)}.vc-faq-item.vc-open .vc-faq-a{display:block}.vc-related{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.vc-related a{padding:8px 14px;border:1px solid var(--b);border-radius:6px;text-decoration:none;color:var(--is)}.vc-promo{margin-top:24px;padding:20px;border:1px solid var(--b);border-radius:12px;background:var(--al);display:flex;justify-content:space-between}.vc-promo a{padding:8px 18px;background:var(--a);color:#fff;border-radius:6px;text-decoration:none}.vc-footer{text-align:center;padding:30px;color:var(--im);font-size:13px}.vc-footer a{color:var(--a)}@media(max-width:600px){.vc-grid,.vc-result-grid{grid-template-columns:1fr}.vc-full,.vc-primary,.vc-status{grid-column:1}.vc-promo{display:block}.vc-promo a{display:inline-block;margin-top:10px}}<\/style>\n<div class=\"vc-calculator\" id=\"vc-vg-lookup\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Classification-band worksheet<\/p><h1 class=\"vc-header-title\">ISO VG Band Lookup at 40 \u00b0C<\/h1><p class=\"vc-header-subtitle\">Compare a documented kinematic-viscosity result with the ISO VG intervals. Values in the gaps are reported as no band match\u2014not forced into a nearest grade.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">20 designations<\/span><span class=\"vc-badge\">mm\u00b2\/s = cSt<\/span><span class=\"vc-badge\">No lubricant selection<\/span><\/div><\/header>\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\" novalidate><div class=\"vc-grid\"><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-viscosity\">Kinematic viscosity at 40 \u00b0C <span class=\"vc-hint\">(mm\u00b2\/s = cSt; &gt;0)<\/span><\/label><input class=\"vc-input\" id=\"vc-viscosity\" inputmode=\"decimal\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-vg\">Or inspect a designation<\/label><select class=\"vc-select\" id=\"vc-vg\"><option value=\"\">\u2014 Select ISO VG \u2014<\/option><option>2<\/option><option>3<\/option><option>5<\/option><option>7<\/option><option>10<\/option><option>15<\/option><option>22<\/option><option>32<\/option><option>46<\/option><option>68<\/option><option>100<\/option><option>150<\/option><option>220<\/option><option>320<\/option><option>460<\/option><option>680<\/option><option>1000<\/option><option>1500<\/option><option>2200<\/option><option>3200<\/option><\/select><\/div><div class=\"vc-field vc-full\"><label class=\"vc-label\" for=\"vc-source\">Measurement or specification record<\/label><input class=\"vc-input\" id=\"vc-source\" type=\"text\" placeholder=\"report ID\/date\/method\/temperature or controlled specification reference\"><\/div><div class=\"vc-field vc-full\"><label class=\"vc-check\" for=\"vc-gate\"><input id=\"vc-gate\" type=\"checkbox\"><span>The value is kinematic viscosity at 40 \u00b0C,not dynamic viscosity or a value at another temperature.Any measurement uncertainty and the applicable test\/specification decision rule are handled by the controlling source.<\/span><\/label><\/div><\/div><div class=\"vc-validation\" id=\"vc-validation\" role=\"status\" aria-live=\"polite\"><\/div><\/form>\n<div class=\"vc-results\" id=\"vc-results\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Band comparison<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\"><div class=\"vc-rcard vc-primary\"><div class=\"vc-rcard-label\">Result<\/div><div class=\"vc-rcard-value\" id=\"vc-r-status\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Table midpoint at 40 \u00b0C<\/div><div class=\"vc-rcard-value\" id=\"vc-r-mid\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Table interval at 40 \u00b0C<\/div><div class=\"vc-rcard-value\" id=\"vc-r-range\">\u2014<\/div><\/div><div class=\"vc-status\" id=\"vc-r-note\">ISO VG alone does not select or approve a lubricant.<\/div><\/div><\/div><\/div>\n<div class=\"vc-section vc-open\"><button class=\"vc-section-toggle\" type=\"button\" aria-expanded=\"true\"><span class=\"vc-section-title\">Classification data and boundaries<\/span><span>\u2304<\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><h3>Band rule<\/h3><div class=\"vc-formula\">lower limit = 0.90 \u00d7 table midpoint; upper limit = 1.10 \u00d7 table midpoint<\/div><p>The grade designation is a rounded label. In particular,the table midpoints for VG 2,3,5 and7 are 2.2,3.2,4.6 and6.8 mm\u00b2\/s\u2014not2,3,5 and7.<\/p><p>The intervals have gaps. This worksheet uses inclusive displayed limits and returns no match outside every row. A real conformity decision at a boundary must follow the controlling measurement uncertainty and decision rule.<\/p><div class=\"vc-table-wrap\"><table class=\"vc-table\"><thead><tr><th>Designation<\/th><th>Midpoint (mm\u00b2\/s)<\/th><th>Minimum (mm\u00b2\/s)<\/th><th>Maximum (mm\u00b2\/s)<\/th><\/tr><\/thead><tbody id=\"vc-ref-tbody\"><\/tbody><\/table><\/div><h3>Scope<\/h3><p>ISO 3448:1992,edition2,confirmed2023,establishes a viscosity classification for industrial liquid lubricants and related fluids. ISO3448:1992\/Cor1:1993 is a published corrigendum. ISO VG is not an application,performance,chemistry,quality,temperature-range or interchangeability approval.<\/p><p>ISO 3104:2023,edition4,is a current procedure for kinematic-viscosity determination within its scope;this browser worksheet does not perform that laboratory measurement.<\/p><div class=\"vc-warning\"><strong>Evidence boundary:<\/strong> the ISO status\/scope and corrigendum are official. Rows through VG1500 are publicly reproduced in Shell&#8217;s manufacturer pocketbook;Kl\u00fcber publicly states the system spans VG2\u2013VG3200 with \u00b110% tolerance. Exact licensed clause\/table and corrigendum text remain <strong>NEEDS_LICENSED_SOURCE<\/strong>.<\/div><h3>Sources<\/h3><p><a href=\"https:\/\/www.iso.org\/standard\/8774.html\" target=\"_blank\" rel=\"noopener\">ISO3448:1992 official record<\/a>; <a href=\"https:\/\/www.iso.org\/standard\/22787.html\" target=\"_blank\" rel=\"noopener\">ISO3448:1992\/Cor1:1993 official record<\/a>; <a href=\"https:\/\/www.iso.org\/standard\/81853.html\" target=\"_blank\" rel=\"noopener\">ISO3104:2023 official record<\/a>; <a href=\"https:\/\/www.shell.com\/content\/dam\/shell\/assets\/en\/business-functions\/business-customer\/marine\/documents\/shell-marine-forward-together-pocketbook-digital.pdf\" target=\"_blank\" rel=\"noopener\">Shell Marine Lubricants Pocketbook<\/a>; <a href=\"https:\/\/www.klueber.com\/br\/pt\/empresa\/novidades\/novidades\/especifica%C3%A7%C3%B5es-gerais-de-%C3%B3leos-parte-1\/\" target=\"_blank\" rel=\"noopener\">Kl\u00fcber ISO VG overview<\/a>.<\/p><\/div><\/div><\/div>\n<div class=\"vc-section\"><button class=\"vc-section-toggle\" type=\"button\" aria-expanded=\"false\"><span class=\"vc-section-title\">Related calculators<\/span><span>\u2304<\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a href=\"\/calculators\/oil-viscosity-temperature\/\">Oil Viscosity\u2013Temperature<\/a><a href=\"\/calculators\/viscosity-converter\/\">Viscosity Units<\/a><\/div><\/div><\/div><\/div><div class=\"vc-section\"><button class=\"vc-section-toggle\" type=\"button\" aria-expanded=\"false\"><span class=\"vc-section-title\">Frequently asked questions<\/span><span>\u2304<\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div id=\"vc-faq-list\"><\/div><\/div><\/div><\/div><div class=\"vc-promo\"><div><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional field balancing instruments and software.<\/div><a href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div><footer class=\"vc-footer\">\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 reviewed 13 July 2026<\/footer><\/div>\n<script>(function(){'use strict';var data=[[2,2.2,1.98,2.42],[3,3.2,2.88,3.52],[5,4.6,4.14,5.06],[7,6.8,6.12,7.48],[10,10,9,11],[15,15,13.5,16.5],[22,22,19.8,24.2],[32,32,28.8,35.2],[46,46,41.4,50.6],[68,68,61.2,74.8],[100,100,90,110],[150,150,135,165],[220,220,198,242],[320,320,288,352],[460,460,414,506],[680,680,612,748],[1000,1000,900,1100],[1500,1500,1350,1650],[2200,2200,1980,2420],[3200,3200,2880,3520]];function $(id){return document.getElementById(id)}function read(raw){var t=String(raw||'').trim();if(!t||(t.includes(',')&&t.includes('.')))return null;t=t.replace(',','.');if(!\/^(?:\\d+(?:\\.\\d*)?|\\.\\d+)$\/.test(t))return null;var v=Number(t);return Number.isFinite(v)&&v>0?v:null}function fmt(v){return 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