{"id":100155,"date":"2026-02-15T20:21:24","date_gmt":"2026-02-15T20:21:24","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100155"},"modified":"2026-04-05T15:40:31","modified_gmt":"2026-04-05T15:40:31","slug":"motor-capacitor-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/motor-capacitor-calculator\/","title":{"rendered":"\u09ae\u09cb\u099f\u09b0 \u0995\u09cd\u09af\u09be\u09aa\u09be\u09b8\u09bf\u099f\u09b0 \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0 \u2014 C = I\/(2\u03c0fV) | Vibromera"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Motor Capacitor Calculator\",\"description\":\"Calculate start and run capacitor values for single-phase motors.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/motor-capacitor-calculator\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"}}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How do I calculate motor capacitor size?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For a run capacitor: C \u2248 P\/(2\u03c0\u00d7f\u00d7V\u00b2\u00d7\u03b7\u00d7cos\u03c6) \u00d7 10\u2076 \u03bcF. A rough rule of thumb is 30-50 \u03bcF per HP for run capacitors and 100-150 \u03bcF per HP for start capacitors.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between start and run capacitors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Start capacitors are electrolytic, high-value (70-400 \u03bcF), used only during startup then disconnected by a centrifugal switch. Run capacitors are film type, lower value (5-60 \u03bcF), and remain in circuit continuously.\"}},\n{\"@type\":\"Question\",\"name\":\"What happens if the capacitor is too small?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Too small: motor may not start (low starting torque), may overheat, reduced efficiency. Too large: excessive current in auxiliary winding, overheating, possible winding damage.\"}},\n{\"@type\":\"Question\",\"name\":\"Can I use a higher voltage capacitor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, using a capacitor with a higher voltage rating is safe. However, never use a lower voltage rating than required \u2014 typically 1.5\u00d7 the supply voltage for safety margin.\"}},\n{\"@type\":\"Question\",\"name\":\"What are PSC and CSIR motors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"PSC (Permanent Split Capacitor) uses a run capacitor only \u2014 simple but lower starting torque. CSIR (Capacitor Start Induction Run) adds a start capacitor with centrifugal switch for higher starting torque, typical for compressors and pumps.\"}}\n]}\n<\/script>\n\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\":\"Motor Capacitor\",\"item\":\"https:\/\/vibromera.eu\/calculators\/motor-capacitor-calculator\/\"}]}<\/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 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class=\"vc-calculator\" id=\"vc-motor-capacitor-calculator\">\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Motor Capacitor Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Calculate start and run capacitor values for single-phase motors. C = I \/ (2\u03c0fV). Estimates based on motor power, voltage, and frequency.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">Start Capacitor<\/span><span class=\"vc-badge\">Run Capacitor<\/span><span class=\"vc-badge\">Single-Phase<\/span><\/div>\n<\/header>\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-power\">Motor Power <span class=\"vc-label-hint\">(W)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-power\" inputmode=\"decimal\" step=\"any\" min=\"0\" placeholder=\"e.g. 750\" value=\"750\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-voltage\">Voltage <span class=\"vc-label-hint\">(V)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-voltage\" inputmode=\"decimal\" step=\"any\" min=\"0\" placeholder=\"e.g. 230\" value=\"230\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-freq\">Frequency <span class=\"vc-label-hint\">(Hz)<\/span><\/label><select class=\"vc-select\" id=\"vc-freq\"><option value=\"50\" selected>50 Hz<\/option><option value=\"60\">60 Hz<\/option><\/select><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-eff\">Efficiency \u03b7 <span class=\"vc-label-hint\">(0\u20131)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-eff\" inputmode=\"decimal\" step=\"0.01\" min=\"0.1\" max=\"1\" placeholder=\"0.75\" value=\"0.75\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-pf\">Power Factor <span class=\"vc-label-hint\">(cos \u03c6)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-pf\" inputmode=\"decimal\" step=\"0.01\" min=\"0.1\" max=\"1\" placeholder=\"0.80\" value=\"0.80\"><\/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-p=\"370\" data-v=\"230\" data-f=\"50\" data-eff=\"0.70\" data-pf=\"0.75\">0.37 kW \/ 230 V<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"750\" data-v=\"230\" data-f=\"50\" data-eff=\"0.75\" data-pf=\"0.80\">0.75 kW \/ 230 V<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"1500\" data-v=\"230\" data-f=\"50\" data-eff=\"0.78\" data-pf=\"0.82\">1.5 kW \/ 230 V<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"2200\" data-v=\"230\" data-f=\"60\" data-eff=\"0.80\" data-pf=\"0.84\">2.2 kW \/ 230 V \/ 60 Hz<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Results<\/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\">Run Capacitor (estimated)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-run\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Start Capacitor (estimated)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-start\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Motor Current<\/div><div class=\"vc-rcard-value\" id=\"vc-r-current\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Min Capacitor Voltage Rating<\/div><div class=\"vc-rcard-value\" id=\"vc-r-vrating\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\"><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 &amp; Formulas<\/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>Capacitor Formula<\/h3><div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n        <p>Start capacitors are typically 3\u20135\u00d7 the run capacitor value. Run capacitors use film dielectric; start capacitors use electrolytic.<\/p>\n    <\/div><\/div>\n<\/div>\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\/motor-nameplate-current\/\">Motor Nameplate Current<\/a><a class=\"vc-related-link\" href=\"\/calculators\/power-factor-correction\/\">Power Factor Correction<\/a><a class=\"vc-related-link\" href=\"\/calculators\/three-phase-motor-power\/\">Three-Phase Power<\/a><\/div><\/div><\/div><\/div>\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<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<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='motor-capacitor-calculator';\n    function $(id){return document.getElementById(id)}\n    function fmt(n,d){if(isNaN(n)||!isFinite(n))return'\u2014';var f=n.toFixed(d===undefined?2:d);return f.replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}\n\n    function calculate(){\n        var P=parseFloat($('vc-power').value);\n        var V=parseFloat($('vc-voltage').value);\n        var f=parseFloat($('vc-freq').value);\n        var eff=parseFloat($('vc-eff').value);\n        var pf=parseFloat($('vc-pf').value);\n        if(!P||!V||!f||!eff||!pf||P<=0||V<=0){$('vc-results').classList.remove('vc-visible');return}\n\n        var I=P\/(V*eff*pf);\n        \/\/ Run capacitor: approximate reactive current for auxiliary winding\n        var Crun=I*1e6\/(2*Math.PI*f*V)*0.6; \/\/ ~60% of line current for auxiliary winding\n        var Cstart=Crun*3.5; \/\/ start cap ~3.5\u00d7 run cap\n        var Vrating=Math.ceil(V*1.5\/50)*50;\n\n        $('vc-r-run').innerHTML=fmt(Crun,0)+' <span class=\"vc-rcard-unit\">\u03bcF<\/span> <span class=\"vc-rcard-unit\">(film, continuous)<\/span>';\n        $('vc-r-start').innerHTML=fmt(Cstart,0)+' <span class=\"vc-rcard-unit\">\u03bcF<\/span> <span class=\"vc-rcard-unit\">(electrolytic, momentary)<\/span>';\n        $('vc-r-current').innerHTML=fmt(I,2)+' <span class=\"vc-rcard-unit\">A<\/span>';\n        $('vc-r-vrating').innerHTML=Vrating+' <span class=\"vc-rcard-unit\">V AC<\/span>';\n        $('vc-results').classList.add('vc-visible');\n        saveHistory({P:P,V:V,Crun:fmt(Crun,0),Cstart:fmt(Cstart,0),_summary:P+'W \u2192 Run '+fmt(Crun,0)+'\u03bcF, Start '+fmt(Cstart,0)+'\u03bcF'});\n    }\n\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn){btn.addEventListener('click',function(e){e.preventDefault();$('vc-power').value=this.getAttribute('data-p');$('vc-voltage').value=this.getAttribute('data-v');$('vc-freq').value=this.getAttribute('data-f');$('vc-eff').value=this.getAttribute('data-eff');$('vc-pf').value=this.getAttribute('data-pf');calculate()})});\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n    $('vc-copy-btn').addEventListener('click',function(){var text='Motor Capacitor\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nRun Cap: '+$('vc-r-run').textContent+'\\nStart Cap: '+$('vc-r-start').textContent+'\\nMotor Current: '+$('vc-r-current').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(text).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';setTimeout(function(){b.classList.remove('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'},2000)})}});\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){btn.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});\n    var faqData=[{q:'How do I calculate motor capacitor size?',a:'<p>Run cap \u2248 30\u201350 \u03bcF\/HP. Start cap \u2248 100\u2013150 \u03bcF\/HP. More precisely: C = I\/(2\u03c0fV) for the auxiliary winding current.<\/p>'},{q:'Start vs run capacitor \u2014 what is the difference?',a:'<p>Start: electrolytic, 70\u2013400 \u03bcF, momentary use with centrifugal switch. Run: film, 5\u201360 \u03bcF, continuous duty.<\/p>'},{q:'What if the capacitor is too small?',a:'<p>Motor may not start, overheat, or have reduced efficiency. Too large causes excess auxiliary winding current and overheating.<\/p>'},{q:'Can I use a higher voltage capacitor?',a:'<p>Yes, higher voltage rating is safe. Never go lower. Use \u22651.5\u00d7 supply voltage for safety margin.<\/p>'},{q:'What are PSC and CSIR motors?',a:'<p>PSC: run cap only, simple, lower starting torque. CSIR: start cap + centrifugal switch, higher starting torque for compressors\/pumps.<\/p>'}];\n    var fl=$('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>'});fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\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 renderFormulas(){try{katex.render('C = \\\\frac{I}{2\\\\pi f V} \\\\times 10^6 \\\\quad [\\\\mu\\\\text{F}]',$('vc-katex-1'),{displayMode:true,throwOnError:false})}catch(e){}}\n    function init(){renderFormulas();calculate()}\n    if(document.readyState==='loading'){document.addEventListener('DOMContentLoaded',init)}else{init()}\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7 \u0985\u09a8\u09b2\u09be\u0987\u09a8 \u098f\u0995\u0995-\u09aa\u09b0\u09cd\u09af\u09be\u09af\u09bc\u09c7\u09b0 \u09ae\u09cb\u099f\u09b0 \u0995\u09cd\u09af\u09be\u09aa\u09be\u09b8\u09bf\u099f\u09b0 \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0\u0964 \u09b6\u09c1\u09b0\u09c1 \u098f\u09ac\u0982 \u099a\u09be\u09b2\u09be\u09a8 \u0995\u09cd\u09af\u09be\u09aa\u09be\u09b8\u09bf\u099f\u09b0 \u09ae\u09be\u09a8 \u0997\u09a3\u09a8\u09be \u0995\u09b0\u09c1\u09a8\u0964 C = I\/(2\u03c0fV)\u0964 \u0987\u09a8\u09aa\u09c1\u099f: \u09ae\u09cb\u099f\u09b0 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0, \u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c, \u09ab\u09cd\u09b0\u09bf\u0995\u09cb\u09af\u09bc\u09c7\u09a8\u09cd\u09b8\u09bf\u0964<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100155","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100155","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100155\/revisions"}],"predecessor-version":[{"id":100941,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100155\/revisions\/100941"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}