{"id":100113,"date":"2026-02-15T20:17:14","date_gmt":"2026-02-15T20:17:14","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100113"},"modified":"2026-02-15T20:17:14","modified_gmt":"2026-02-15T20:17:14","slug":"gear-oil-quantity","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/nb\/calculators\/gear-oil-quantity\/","title":{"rendered":"Kalkulator for giroljemengde | Girkassens fyllevolum | Termisk ekspansjon | Gratis verkt\u00f8y"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Gear Oil Quantity Calculator\",\"description\":\"Estimate oil quantity for gearboxes. 5 gearbox types, thermal expansion, drain interval, oil weight.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/gear-oil-quantity\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2025-06-01\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How much oil does a gearbox need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oil fill depends on gearbox type and size. Empirical: V \u2248 k \u00d7 a\u00b2 \u00d7 b, where a = center distance, b = face width. Factor k varies: spur\/helical 0.5, bevel 0.6, worm 0.8, planetary 0.35.\"}},\n{\"@type\":\"Question\",\"name\":\"What oil level should I maintain?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For splash lube: lowest gear immersed 1-2\u00d7 tooth height. Worm gears: oil to worm shaft center. Planetary: 1\/3 to 1\/2 housing height. Always check manufacturer marks.\"}},\n{\"@type\":\"Question\",\"name\":\"How does temperature affect oil level?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oil expands ~0.07% per \u00b0C. A 50\u00b0C temperature rise on 10 L increases volume by ~350 mL. Fill to cold level mark \u2014 hot level will be higher.\"}},\n{\"@type\":\"Question\",\"name\":\"What ISO VG grade for gearboxes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"VG 220 for general spur\/helical, VG 320-460 for worm or heavy loads, VG 68-150 for high-speed. Follow manufacturer specs.\"}},\n{\"@type\":\"Question\",\"name\":\"Should I use synthetic gear oil?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Synthetic (PAO, PAG) recommended for worm gears (higher efficiency), extreme temps, and long intervals. Better VI and oxidation stability. PAG especially good for worm efficiency.\"}}\n]}<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&#038;family=JetBrains+Mono:wght@400;500;600&#038;family=Fraunces:opsz,wght@9..144,700;9..144,800&#038;display=swap\" rel=\"stylesheet\">\n\n<link rel=\"stylesheet\" 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16px;font-size:13px;color:var(--vc-ink-muted)}.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}\n@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\n<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-gear-oil\">\n<header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p><h1 class=\"vc-header-title\">Gearbox Oil Fill Volume Calculator<\/h1><p class=\"vc-header-subtitle\">Estimate oil quantity for industrial gearboxes. Supports spur, helical, bevel, worm, and planetary types. Oil level at temperature, thermal expansion, drain interval, and oil weight.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">5 Gearbox Types<\/span><span class=\"vc-badge\">Thermal Expansion<\/span><span class=\"vc-badge\">Drain Interval<\/span><span class=\"vc-badge\">Oil Weight<\/span><\/div><\/header>\n\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-type\">Gearbox Type<\/label><select class=\"vc-select\" id=\"vc-type\"><option value=\"spur\" selected>Spur \/ Helical<\/option><option value=\"bevel\">Bevel (Straight \/ Spiral)<\/option><option value=\"worm\">Worm<\/option><option value=\"planetary\">Planetary (Epicyclic)<\/option><option value=\"hypoid\">Hypoid<\/option><\/select><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-stages\">Number of Stages<\/label><select class=\"vc-select\" id=\"vc-stages\"><option value=\"1\" selected>1 Stage<\/option><option value=\"2\">2 Stages<\/option><option value=\"3\">3 Stages<\/option><option value=\"4\">4 Stages<\/option><\/select><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-cd\">Center Distance <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-cd\" step=\"any\" value=\"160\" placeholder=\"e.g. 160\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-fw\">Face Width <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-fw\" step=\"any\" value=\"50\" placeholder=\"e.g. 50\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-oildens\">Oil Density <span class=\"vc-label-hint\">(kg\/L at 15\u00b0C)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-oildens\" step=\"any\" value=\"0.87\" placeholder=\"e.g. 0.87\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-optemp\">Operating Temperature <span class=\"vc-label-hint\">(\u00b0C)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-optemp\" step=\"any\" value=\"70\" placeholder=\"e.g. 70\"><\/div>\n        <\/div>\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-tp=\"spur\" data-st=\"1\" data-cd=\"100\" data-fw=\"30\">Small Spur 1-stg a=100<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-tp=\"spur\" data-st=\"2\" data-cd=\"200\" data-fw=\"60\">Medium Helical 2-stg a=200<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-tp=\"worm\" data-st=\"1\" data-cd=\"80\" data-fw=\"50\">Worm a=80<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-tp=\"planetary\" data-st=\"2\" data-cd=\"120\" data-fw=\"40\">Planetary 2-stg a=120<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-tp=\"bevel\" data-st=\"1\" data-cd=\"150\" data-fw=\"45\">Bevel a=150<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Oil Volume &amp; Specifications<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button><\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Estimated Oil Fill Volume<\/div><div class=\"vc-rcard-value\" id=\"vc-r-vol\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Single Stage Volume<\/div><div class=\"vc-rcard-value\" id=\"vc-r-s1\" style=\"font-size:18px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Oil Weight<\/div><div class=\"vc-rcard-value\" id=\"vc-r-weight\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Volume at Operating Temp<\/div><div class=\"vc-rcard-value\" id=\"vc-r-hot\" style=\"font-size:18px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Thermal Expansion<\/div><div class=\"vc-rcard-value\" id=\"vc-r-expand\" style=\"font-size:18px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Type Factor (k)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-k\" style=\"font-size:18px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Recommended VG Grade<\/div><div class=\"vc-rcard-value\" id=\"vc-r-vg\" style=\"font-size:15px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Oil Level Guidance<\/div><div class=\"vc-rcard-value\" id=\"vc-r-level\" style=\"font-size:13px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Drain Interval (mineral)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-drain\" style=\"font-size:14px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Drain Interval (synthetic)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-drains\" style=\"font-size:14px\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Theory, Formulas &amp; Oil Guide<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>Empirical Oil Volume Formula<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n        <p>Where <strong>k<\/strong> is a type-dependent factor, <strong>a<\/strong> is center distance (m), <strong>b<\/strong> is face width (m). Multi-stage: each additional stage adds ~70% of the first stage volume.<\/p>\n        <table class=\"vc-table\"><thead><tr><th>Gearbox Type<\/th><th>Factor k<\/th><th>Fill Ratio<\/th><th>VG Grade<\/th><\/tr><\/thead><tbody>\n            <tr><td>Spur \/ Helical<\/td><td>0.50<\/td><td>1\/3 housing<\/td><td>VG 220<\/td><\/tr>\n            <tr><td>Bevel<\/td><td>0.60<\/td><td>Per marks<\/td><td>VG 220\u2013320<\/td><\/tr>\n            <tr><td>Worm<\/td><td>0.80<\/td><td>To worm center<\/td><td>VG 320\u2013460 (PAG)<\/td><\/tr>\n            <tr><td>Planetary<\/td><td>0.35<\/td><td>1\/3\u20131\/2 housing<\/td><td>VG 150\u2013220<\/td><\/tr>\n            <tr><td>Hypoid<\/td><td>0.65<\/td><td>Per marks<\/td><td>VG 220\u2013320 (EP)<\/td><\/tr>\n        <\/tbody><\/table>\n        <h3>Oil Thermal Expansion<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n        <p>Mineral oil expansion coefficient \u03b2 \u2248 0.0007\/\u00b0C. Synthetic PAO similar. This means ~7% expansion per 100\u00b0C rise.<\/p>\n        <h3>Practical Example<\/h3>\n        <div class=\"vc-example-box\"><div class=\"vc-example-title\">Example \u2014 2-Stage Helical Gearbox, a=200mm, b=60mm<\/div>\n            <p>V\u2081 = 0.50 \u00d7 0.200\u00b2 \u00d7 0.060 \u00d7 1000 = <strong>1.20 L<\/strong><\/p>\n            <p>V_total = 1.20 + 1.20 \u00d7 0.70 = <strong>2.04 L<\/strong><\/p>\n            <p>Oil weight = 2.04 \u00d7 0.87 = <strong>1.77 kg<\/strong><\/p>\n            <p>At 70\u00b0C (vs 15\u00b0C fill): V_hot = 2.04 \u00d7 (1 + 0.0007 \u00d7 55) = <strong>2.12 L<\/strong> (+79 mL)<\/p>\n        <\/div>\n        <h3>Drain Interval Guidelines<\/h3>\n        <table class=\"vc-table\"><thead><tr><th>Oil Type<\/th><th>Normal (\u226470\u00b0C)<\/th><th>Warm (70-90\u00b0C)<\/th><th>Hot (>90\u00b0C)<\/th><\/tr><\/thead><tbody>\n            <tr><td>Mineral (VG 220)<\/td><td>8,000\u201310,000 h<\/td><td>4,000\u20136,000 h<\/td><td>2,000\u20133,000 h<\/td><\/tr>\n            <tr><td>Semi-synthetic<\/td><td>12,000\u201315,000 h<\/td><td>6,000\u201310,000 h<\/td><td>3,000\u20135,000 h<\/td><\/tr>\n            <tr><td>Full synthetic (PAO)<\/td><td>15,000\u201320,000 h<\/td><td>10,000\u201315,000 h<\/td><td>5,000\u20138,000 h<\/td><\/tr>\n            <tr><td>PAG (worm gears)<\/td><td>20,000\u201330,000 h<\/td><td>12,000\u201318,000 h<\/td><td>6,000\u201310,000 h<\/td><\/tr>\n        <\/tbody><\/table>\n        <div class=\"vc-warning-box\"><p style=\"margin:0;font-size:14px;color:var(--vc-ink-secondary)\"><strong>\u26a0\ufe0f Note:<\/strong> These are approximate empirical values. Always follow the gearbox manufacturer&#8217;s specification for actual fill volume and oil grade.<\/p><\/div>\n    <\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-related\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/oil-viscosity-temperature\/\">Oil Viscosity\u2013Temperature<\/a><a class=\"vc-related-link\" href=\"\/calculators\/oil-change-interval\/\">Oil Change Interval<\/a><a class=\"vc-related-link\" href=\"\/calculators\/density-mass-volume\/\">Density Calculator<\/a><\/div><\/div><\/div><\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-faq\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div><\/div>\n\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional instruments. Used in 50+ countries.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n<\/div>\n\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\n<script>\n(function(){\n    'use strict';var SLUG='gear-oil-quantity';function $(id){return document.getElementById(id)}\n    var K={spur:0.50,bevel:0.60,worm:0.80,planetary:0.35,hypoid:0.65};\n    var VG={spur:'VG 220 (general) \/ VG 320 (heavy)',bevel:'VG 220 \u2013 VG 320',worm:'VG 320 \u2013 VG 460 (PAG recommended for efficiency)',planetary:'VG 150 \u2013 VG 220',hypoid:'VG 220 \u2013 VG 320 (EP additive required)'};\n    var LEVEL={spur:'Lowest gear immersed 1\u20132\u00d7 tooth height. Typically 1\/3 housing height.',bevel:'Oil sump level per manufacturer sight glass or dipstick marks.',worm:'Oil level at worm shaft center line. Critical for cooling.',planetary:'1\/3 \u2013 1\/2 housing height. Check sun gear immersion.',hypoid:'Per manufacturer marks. Pinion should have adequate splash.'};\n    var DRAIN_MIN={spur:8000,bevel:8000,worm:6000,planetary:10000,hypoid:8000};\n    var DRAIN_SYN={spur:18000,bevel:18000,worm:25000,planetary:20000,hypoid:18000};\n    var BETA=0.0007; \/\/ thermal expansion coeff of mineral oil per \u00b0C\n\n    function fmt(n,d){return isNaN(n)||!isFinite(n)?'\u2014':n.toFixed(d===undefined?2:d)}\n\n    function calculate(){\n        var type=$('vc-type').value;var stages=parseInt($('vc-stages').value)||1;\n        var cd=parseFloat($('vc-cd').value);var fw=parseFloat($('vc-fw').value);\n        var oilDens=parseFloat($('vc-oildens').value)||0.87;\n        var opTemp=parseFloat($('vc-optemp').value)||70;\n        if(isNaN(cd)||isNaN(fw)||cd<=0||fw<=0){$('vc-results').classList.remove('vc-visible');return}\n        var k=K[type]||0.5;\n        var aM=cd\/1000, bM=fw\/1000;\n        var v1=k*aM*aM*bM*1000; \/\/ litres\n        var vTotal=v1;for(var s=1;s<stages;s++)vTotal+=v1*0.7;\n        var weight=vTotal*oilDens;\n        var dT=opTemp-15;\n        var vHot=vTotal*(1+BETA*dT);\n        var expand=vHot-vTotal;\n        \/\/ Drain intervals (Arrhenius-like adjustment for temp)\n        var tempFactor=opTemp<=70?1.0:opTemp<=90?0.5:0.25;\n        var drainMin=Math.round(DRAIN_MIN[type]*tempFactor\/100)*100;\n        var drainSyn=Math.round(DRAIN_SYN[type]*tempFactor\/100)*100;\n\n        $('vc-r-vol').innerHTML=fmt(vTotal,1)+' <span class=\"vc-rcard-unit\">litres<\/span> <span class=\"vc-rcard-unit\">('+fmt(vTotal\/3.785,1)+' US gal)<\/span>';\n        $('vc-r-s1').innerHTML=fmt(v1,2)+' <span class=\"vc-rcard-unit\">L per stage<\/span>';\n        $('vc-r-weight').innerHTML=fmt(weight,2)+' <span class=\"vc-rcard-unit\">kg<\/span> <span class=\"vc-rcard-unit\">('+fmt(weight*2.205,2)+' lb)<\/span>';\n        $('vc-r-hot').innerHTML=fmt(vHot,2)+' <span class=\"vc-rcard-unit\">L at '+opTemp+'\u00b0C<\/span>';\n        $('vc-r-expand').innerHTML='+'+fmt(expand*1000,0)+' <span class=\"vc-rcard-unit\">mL<\/span> <span class=\"vc-rcard-unit\">(+'+fmt(expand\/vTotal*100,1)+'%)<\/span>';\n        $('vc-r-k').textContent=k+' ('+type+')';\n        $('vc-r-vg').textContent=VG[type]||'\u2014';\n        $('vc-r-level').textContent=LEVEL[type]||'\u2014';\n        $('vc-r-drain').innerHTML=drainMin.toLocaleString()+' <span class=\"vc-rcard-unit\">hours (at '+opTemp+'\u00b0C)<\/span>';\n        $('vc-r-drains').innerHTML=drainSyn.toLocaleString()+' <span class=\"vc-rcard-unit\">hours (at '+opTemp+'\u00b0C)<\/span>';\n        $('vc-results').classList.add('vc-visible');\n\n        try{var u=new URLSearchParams();u.set('type',type);u.set('stages',stages);u.set('cd',cd);u.set('fw',fw);u.set('temp',opTemp);history.replaceState(null,'','?'+u.toString())}catch(e){}\n        saveHistory({type:type,stages:stages,cd:cd,fw:fw,vol:+fmt(vTotal,2),_summary:type+' '+stages+'stg a='+cd+' \u2192 '+fmt(vTotal,1)+'L'});\n    }\n\n    function saveHistory(e){var k='vc_history_'+SLUG;var a=[];try{a=JSON.parse(localStorage.getItem(k))||[]}catch(x){}e._ts=new Date().toISOString();a.unshift(e);if(a.length>10)a=a.slice(0,10);try{localStorage.setItem(k,JSON.stringify(a))}catch(x){}}\n    function loadURL(){try{var p=new URLSearchParams(location.search);if(p.has('type')){$('vc-type').value=p.get('type');$('vc-stages').value=p.get('stages');$('vc-cd').value=p.get('cd');$('vc-fw').value=p.get('fw');if(p.has('temp'))$('vc-optemp').value=p.get('temp')}}catch(e){}}\n\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n    document.querySelectorAll('.vc-preset-btn').forEach(function(b){b.addEventListener('click',function(e){e.preventDefault();$('vc-type').value=this.getAttribute('data-tp');$('vc-stages').value=this.getAttribute('data-st');$('vc-cd').value=this.getAttribute('data-cd');$('vc-fw').value=this.getAttribute('data-fw');calculate()})});\n    $('vc-copy-btn').addEventListener('click',function(){var t='Gear Oil Volume\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nVolume: '+$('vc-r-vol').textContent+'\\nWeight: '+$('vc-r-weight').textContent+'\\nAt '+$('vc-optemp').value+'\u00b0C: '+$('vc-r-hot').textContent+'\\nVG: '+$('vc-r-vg').textContent+'\\nDrain (mineral): '+$('vc-r-drain').textContent+'\\nDrain (synthetic): '+$('vc-r-drains').textContent+'\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu';if(navigator.clipboard)navigator.clipboard.writeText(t)});\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){btn.addEventListener('click',function(){this.closest('.vc-section').classList.toggle('vc-open')})});\n\n    var faqData=[\n        {q:'How much oil does a gearbox need?',a:'<p>Depends on type and size. Empirically: V \u2248 k \u00d7 a\u00b2 \u00d7 b. For a 2-stage helical with a=200mm, b=60mm: V \u2248 0.5 \u00d7 0.04 \u00d7 0.06 \u00d7 1000 \u00d7 1.7 \u2248 2.04 L. Always verify with manufacturer data.<\/p>'},\n        {q:'What oil level should I maintain?',a:'<p>Splash lube: lowest gear immersed 1\u20132\u00d7 tooth height. Worm: oil up to worm center for cooling. Planetary: 1\/3\u20131\/2 housing. Always fill at ambient temperature and check hot level is not above max mark.<\/p>'},\n        {q:'How does temperature affect oil level and volume?',a:'<p>Oil expands ~0.07% per \u00b0C (\u03b2 \u2248 0.0007\/\u00b0C). Over a 55\u00b0C rise (15\u219270\u00b0C), 10 L becomes 10.39 L. Fill to the COLD mark \u2014 the hot level will rise accordingly. Overfilling can cause foaming and seal damage.<\/p>'},\n        {q:'What ISO VG grade for gearboxes?',a:'<p>VG 220 for general spur\/helical, VG 320\u2013460 for worm or heavy loads (PAG preferred for worm efficiency), VG 68\u2013150 for high-speed units. Always follow the gearbox manufacturer specification.<\/p>'},\n        {q:'Should I use synthetic gear oil?',a:'<p>Synthetic oils (PAO, PAG) offer: better VI (less viscosity change with temp), longer drain intervals (2\u20133\u00d7), better low-temp flow, and better oxidation stability. PAG is especially recommended for worm gears where it can improve efficiency by 2\u20134%. The higher upfront cost is offset by longer life and lower energy consumption.<\/p>'}\n    ];\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+f.a+'<\/div><\/div><\/div>'});\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(!b)return;b.closest('.vc-faq-item').classList.toggle('vc-open')});\n\n    function renderFormulas(){try{\n        katex.render('V_{\\\\text{oil}} = k \\\\cdot a^2 \\\\cdot b \\\\quad [\\\\text{litres}],\\\\;\\\\; a,b\\\\;\\\\text{in metres}',$('vc-katex-1'),{displayMode:true,throwOnError:false});\n        katex.render('V_{\\\\text{hot}} = V_{\\\\text{cold}} \\\\times (1 + \\\\beta \\\\cdot \\\\Delta T),\\\\quad \\\\beta \\\\approx 0.0007\\\\;\/\u00b0\\\\text{C}',$('vc-katex-2'),{displayMode:true,throwOnError:false});\n    }catch(e){}}\n    function init(){loadURL();renderFormulas();calculate()}\n    if(document.readyState==='loading')document.addEventListener('DOMContentLoaded',init);else init();\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Gratis kalkulator for giroljep\u00e5fyllingsvolum. Girkassetyper for sylindrisk, spiralformet, konisk, snekke- og planetgir. Oljeniv\u00e5 ved temperatur, termisk ekspansjon, oljeskiftintervall, oljevekt fra volum\u00d7tetthet.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100113","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/calculator\/100113","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/calculator\/100113\/revisions"}],"predecessor-version":[{"id":100414,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/calculator\/100113\/revisions\/100414"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media?parent=100113"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/categories?post=100113"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/tags?post=100113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}