{"id":100160,"date":"2026-02-15T20:21:41","date_gmt":"2026-02-15T20:21:41","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100160"},"modified":"2026-02-15T20:21:41","modified_gmt":"2026-02-15T20:21:41","slug":"motor-sizing-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/motor-sizing-calculator\/","title":{"rendered":"Motor Sizing Calculator | Load \u2192 Motor Selection"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Motor Sizing Calculator\",\"description\":\"Calculate required motor power from load parameters and select standard IEC motor size.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/motor-sizing-calculator\/\",\"applicationCategory\":\"Engineering 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class=\"vc-calculator\">\n\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Motor Sizing Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Calculate required motor power from load parameters and get recommended standard IEC motor size with starting current and torque estimates.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">IEC Standard Sizes<\/span><span class=\"vc-badge\">0.37 \u2013 315 kW<\/span><span class=\"vc-badge\">DOL \/ Y-\u0394 \/ VFD<\/span><\/div>\n<\/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\">\n                <label class=\"vc-label\" for=\"vc-load-type\">Load Type<\/label>\n                <select class=\"vc-select\" id=\"vc-load-type\">\n                    <option value=\"constant_torque\" selected>Constant Torque (conveyors, compressors)<\/option>\n                    <option value=\"variable_torque\">Variable Torque (fans, pumps)<\/option>\n                    <option value=\"constant_power\">Constant Power (winders, lathes)<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-input-mode\">Input Mode<\/label>\n                <select class=\"vc-select\" id=\"vc-input-mode\">\n                    <option value=\"power\" selected>Known Power (kW)<\/option>\n                    <option value=\"torque\">Known Torque (Nm)<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-load-value\">Load Value <span class=\"vc-label-hint\" id=\"vc-load-unit\">(kW)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-load-value\" inputmode=\"decimal\" step=\"any\" min=\"0.01\" placeholder=\"e.g. 7.5\" value=\"7.5\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-speed\">Required Speed <span class=\"vc-label-hint\">(RPM)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-speed\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 1450\" value=\"1450\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-sf\">Service Factor<\/label>\n                <select class=\"vc-select\" id=\"vc-sf\">\n                    <option value=\"1.0\">1.0 \u2014 Normal conditions<\/option>\n                    <option value=\"1.15\" selected>1.15 \u2014 Moderate overloads<\/option>\n                    <option value=\"1.25\">1.25 \u2014 Heavy starts, high ambient<\/option>\n                    <option value=\"1.5\">1.5 \u2014 Severe conditions<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-start-method\">Starting Method<\/label>\n                <select class=\"vc-select\" id=\"vc-start-method\">\n                    <option value=\"DOL\" selected>DOL (Direct On Line)<\/option>\n                    <option value=\"YD\">Star-Delta (Y-\u0394)<\/option>\n                    <option value=\"SS\">Soft Starter<\/option>\n                    <option value=\"VFD\">VFD (Variable Frequency Drive)<\/option>\n                <\/select>\n            <\/div>\n        <\/div>\n    <\/form>\n\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\">\n            <h2 class=\"vc-results-title\">Motor Selection<\/h2>\n            <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>\n        <\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\">\n                <div class=\"vc-rcard-label\">Recommended Standard Motor<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-motor\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Required Power (with SF)<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-required\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Load Torque<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-torque\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Starting Current (est.)<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-istart\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Starting Torque Ratio<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-tstart\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Motor Utilization<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-util\">\u2014<\/div>\n            <\/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\">\n        <span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Theory &amp; Standard Sizes<\/span><\/span>\n        <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>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner vc-theory\">\n            <h3>Motor Power Calculation<\/h3>\n            <div class=\"vc-formula-box\">P<sub>required<\/sub> = P<sub>load<\/sub> \u00d7 Service Factor &nbsp;&nbsp;or&nbsp;&nbsp; P = T \u00d7 n \/ 9550<\/div>\n            <h3>IEC Standard Motor Sizes (kW)<\/h3>\n            <table class=\"vc-table\">\n                <thead><tr><th>Range<\/th><th>Available Sizes (kW)<\/th><\/tr><\/thead>\n                <tbody>\n                    <tr><td>Small<\/td><td>0.37, 0.55, 0.75, 1.1, 1.5, 2.2, 3.0, 4.0<\/td><\/tr>\n                    <tr><td>Medium<\/td><td>5.5, 7.5, 11, 15, 18.5, 22, 30, 37<\/td><\/tr>\n                    <tr><td>Large<\/td><td>45, 55, 75, 90, 110, 132, 160, 200, 250, 315<\/td><\/tr>\n                <\/tbody>\n            <\/table>\n            <h3>Starting Current Multipliers<\/h3>\n            <ul>\n                <li><strong>DOL<\/strong> \u2014 6\u20138\u00d7 rated current<\/li>\n                <li><strong>Star-Delta<\/strong> \u2014 2\u20133\u00d7 rated (\u00f73 of DOL)<\/li>\n                <li><strong>Soft Starter<\/strong> \u2014 2\u20134\u00d7 rated<\/li>\n                <li><strong>VFD<\/strong> \u2014 1\u20131.5\u00d7 rated<\/li>\n            <\/ul>\n            <div class=\"vc-info-box\"><p><strong>\u2139\ufe0f Tip:<\/strong> Always select the next standard size above the calculated requirement. Oversizing by one step provides thermal margin and longer bearing life.<\/p><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-related\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span>\n        <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>\n    <\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\">\n        <a class=\"vc-related-link\" href=\"\/calculators\/motor-nameplate-decoder\/\">Motor Nameplate Decoder<\/a>\n        <a class=\"vc-related-link\" href=\"\/calculators\/star-delta-starter-calculator\/\">Star-Delta Starter<\/a>\n        <a class=\"vc-related-link\" href=\"\/calculators\/rpm-to-rads-converter\/\">RPM Converter<\/a>\n    <\/div><\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-faq\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span>\n        <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>\n    <\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\n<\/div>\n\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Balance motors on-site, diagnose electrical and mechanical faults.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>&copy; 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p><p style=\"font-size:12px;margin-top:4px;\">Motor Sizing Calculator. Last updated: February 2025<\/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>\n(function(){\n    'use strict';\n    function $(id){return document.getElementById(id)}\n    function fmt(n,d){if(isNaN(n)||!isFinite(n))return '\u2014';return n.toFixed(d===undefined?2:d).replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}\n\n    var STD_SIZES=[0.37,0.55,0.75,1.1,1.5,2.2,3,4,5.5,7.5,11,15,18.5,22,30,37,45,55,75,90,110,132,160,200,250,315];\n    var START_MULT={DOL:{i:7,t:1.5,label:'DOL'},YD:{i:2.3,t:0.5,label:'Y-\u0394'},SS:{i:3,t:0.7,label:'Soft Starter'},VFD:{i:1.2,t:1.5,label:'VFD'}};\n\n    function nextStd(p){for(var i=0;i<STD_SIZES.length;i++){if(STD_SIZES[i]>=p)return STD_SIZES[i]}return STD_SIZES[STD_SIZES.length-1]}\n\n    $('vc-input-mode').addEventListener('change',function(){$('vc-load-unit').textContent=this.value==='torque'?'(Nm)':'(kW)'});\n\n    function calculate(){\n        var mode=$('vc-input-mode').value;\n        var val=parseFloat($('vc-load-value').value);\n        var speed=parseFloat($('vc-speed').value);\n        var sf=parseFloat($('vc-sf').value);\n        var sm=$('vc-start-method').value;\n        if(!val||val<=0||!speed||speed<=0){$('vc-results').classList.remove('vc-visible');return}\n\n        var loadPower,loadTorque;\n        if(mode==='torque'){loadTorque=val;loadPower=val*speed\/9550}\n        else{loadPower=val;loadTorque=val*9550\/speed}\n\n        var reqPower=loadPower*sf;\n        var selPower=nextStd(reqPower);\n        var selTorque=selPower*9550\/speed;\n        var ratedCurrent=selPower*1000\/(Math.sqrt(3)*400*0.85); \/\/ est. at 400V, pf=0.85\n        var startI=ratedCurrent*START_MULT[sm].i;\n        var startTratio=START_MULT[sm].t;\n        var util=reqPower\/selPower*100;\n\n        $('vc-r-motor').innerHTML=fmt(selPower,selPower<10?2:1)+' <span class=\"vc-rcard-unit\">kW<\/span> <span class=\"vc-rcard-unit\">('+fmt(selPower*1.341,1)+' HP)<\/span>';\n        $('vc-r-required').innerHTML=fmt(reqPower,2)+' <span class=\"vc-rcard-unit\">kW<\/span>';\n        $('vc-r-torque').innerHTML=fmt(loadTorque,1)+' <span class=\"vc-rcard-unit\">Nm<\/span>';\n        $('vc-r-istart').innerHTML='~'+fmt(startI,0)+' <span class=\"vc-rcard-unit\">A<\/span> <span class=\"vc-rcard-unit\">('+START_MULT[sm].label+', '+fmt(START_MULT[sm].i,1)+'\u00d7 I<sub>n<\/sub>)<\/span>';\n        $('vc-r-tstart').innerHTML=fmt(startTratio,1)+'\u00d7 <span class=\"vc-rcard-unit\">T<sub>n<\/sub><\/span>';\n        $('vc-r-util').innerHTML=fmt(util,1)+'<span class=\"vc-rcard-unit\">%<\/span>';\n        $('vc-results').classList.add('vc-visible');\n    }\n\n    $('vc-form').addEventListener('input',calculate);\n    $('vc-form').addEventListener('change',calculate);\n\n    $('vc-copy-btn').addEventListener('click',function(){\n        var text='Motor Sizing Result\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nSelected Motor: '+$('vc-r-motor').textContent+'\\nRequired Power: '+$('vc-r-required').textContent+'\\nTorque: '+$('vc-r-torque').textContent+'\\nStarting Current: '+$('vc-r-istart').textContent+'\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu';\n        if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('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    });\n\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\n    var faqData=[\n        {q:'How do I choose the right service factor?',a:'<p>Service factor (SF) accounts for operating conditions beyond rated values. Use 1.0 for ideal conditions, 1.15 for moderate ambient or occasional overloads, 1.25 for harsh environments, and 1.5 for severe duty with frequent starts or high-inertia loads.<\/p>'},\n        {q:'What is the difference between constant torque and variable torque loads?',a:'<p><strong>Constant torque<\/strong> loads (conveyors, positive displacement pumps) require the same torque regardless of speed \u2014 power is proportional to speed. <strong>Variable torque<\/strong> loads (centrifugal fans\/pumps) have torque proportional to speed\u00b2 and power proportional to speed\u00b3 \u2014 they need much less power at reduced speed.<\/p>'},\n        {q:'Why not just use the exact calculated power?',a:'<p>Motors are only made in standard sizes. You must always select the next standard size up. Additionally, slight oversizing (10-15%) provides thermal headroom, compensates for voltage variations, and extends bearing life.<\/p>'},\n        {q:'When should I use a VFD instead of DOL?',a:'<p>Use a VFD when: (1) variable speed is needed, (2) soft starting is required, (3) energy savings on variable torque loads are important, (4) the power supply cannot handle DOL starting current. VFDs also reduce mechanical stress on couplings and driven equipment.<\/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 init(){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 \u09ae\u09cb\u099f\u09b0 \u0986\u0995\u09be\u09b0 \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0\u0964 \u09b2\u09cb\u09a1\u09c7\u09b0 \u09a7\u09b0\u09a8, \u099f\u09b0\u09cd\u0995\/\u09b6\u0995\u09cd\u09a4\u09bf, \u0997\u09a4\u09bf, \u0995\u09be\u099c\u09c7\u09b0 \u099a\u0995\u09cd\u09b0 \u09b2\u09bf\u0996\u09c1\u09a8 \u098f\u09ac\u0982 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 IEC \u09aa\u09b0\u09bf\u09b8\u09b0 \u09e6.\u0969\u096d-\u0969\u0967\u096b kW \u09a5\u09c7\u0995\u09c7 \u09b8\u09c1\u09aa\u09be\u09b0\u09bf\u09b6\u0995\u09c3\u09a4 \u09ae\u09cb\u099f\u09b0 \u0986\u0995\u09be\u09b0 \u09aa\u09be\u09a8 \u09b6\u09c1\u09b0\u09c1 \u0995\u09b0\u09be\u09b0 \u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u098f\u09ac\u0982 \u099f\u09b0\u09cd\u0995 \u0985\u09a8\u09c1\u09ae\u09be\u09a8 \u09b8\u09b9\u0964<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100160","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100160","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":1,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100160\/revisions"}],"predecessor-version":[{"id":100474,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100160\/revisions\/100474"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}