{"id":100163,"date":"2026-02-15T20:21:50","date_gmt":"2026-02-15T20:21:50","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100163"},"modified":"2026-04-05T15:39:34","modified_gmt":"2026-04-05T15:39:34","slug":"motor-torque-from-current","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/pt_br\/calculators\/motor-torque-from-current\/","title":{"rendered":"Calculadora de torque do motor a partir da corrente | Ferramenta online gratuita"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Motor Torque from Current Calculator\",\"description\":\"Calculate motor shaft torque from current via current\u2192power\u2192torque chain. T=P\u00d79549\/n.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/motor-torque-from-current\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"}}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How do I calculate motor torque from current?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Step 1: P = \u221a3 \u00d7 V \u00d7 I \u00d7 cos \u03c6 \u00d7 \u03b7 (shaft power in W). Step 2: T = P \u00d7 9549 \/ n (in N\u00b7m), where n is speed in RPM. The constant 9549 converts kW and RPM to N\u00b7m.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the 9549 constant?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"T = P \u00d7 9549 \/ n comes from T = P \/ \u03c9, where \u03c9 = 2\u03c0n\/60. So T = P \u00d7 60\/(2\u03c0\u00d7n) = P \u00d7 9549\/n when P is in kW and T in N\u00b7m. For P in watts: T = P \u00d7 9.549\/n.\"}},\n{\"@type\":\"Question\",\"name\":\"What is rated torque vs starting torque?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Rated torque is the continuous torque at full load and rated speed. Starting torque is the torque at zero speed (locked rotor). For standard induction motors, starting torque is typically 150-300% of rated torque.\"}},\n{\"@type\":\"Question\",\"name\":\"How does speed affect torque?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For constant power: T = P\/\u03c9, so torque is inversely proportional to speed. Below base speed with VFD (constant V\/f): torque stays roughly constant. Above base speed (field weakening): torque drops as 1\/n.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between shaft torque and air-gap torque?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Air-gap torque is the electromagnetic torque produced in the motor. Shaft torque is lower due to friction and windage losses. For practical purposes, T_shaft = P_output \u00d7 9549 \/ 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 Torque from Current\",\"item\":\"https:\/\/vibromera.eu\/calculators\/motor-torque-from-current\/\"}]}<\/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-torque-from-current\">\n<header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p><h1 class=\"vc-header-title\">Motor Torque from Current Calculator<\/h1><p class=\"vc-header-subtitle\">Chain calculation: Current \u2192 Power \u2192 Torque. T = P \u00d7 9549 \/ n (N\u00b7m). Enter current or power, voltage, speed.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">T = 9549 \u00d7 P\/n<\/span><span class=\"vc-badge\">I \u2192 P \u2192 T<\/span><span class=\"vc-badge\">N\u00b7m \/ lb\u00b7ft<\/span><\/div><\/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-current\">Line Current <span class=\"vc-label-hint\">(A)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-current\" inputmode=\"decimal\" step=\"any\" min=\"0\" placeholder=\"e.g. 28\" value=\"28\"><\/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. 400\" value=\"400\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-speed\">Speed <span class=\"vc-label-hint\">(RPM)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-speed\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 1460\" value=\"1460\"><\/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=\"0.85\" value=\"0.85\"><\/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=\"0.91\" value=\"0.91\"><\/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-i=\"17\" data-v=\"400\" data-n=\"1440\" data-pf=\"0.84\" data-eff=\"0.89\">7.5 kW \/ 1440 RPM<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-i=\"28\" data-v=\"400\" data-n=\"1460\" data-pf=\"0.85\" data-eff=\"0.91\">15 kW \/ 1460 RPM<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-i=\"73\" data-v=\"400\" data-n=\"1475\" data-pf=\"0.86\" data-eff=\"0.93\">37 kW \/ 1475 RPM<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-i=\"145\" data-v=\"400\" data-n=\"1485\" data-pf=\"0.87\" data-eff=\"0.95\">75 kW \/ 1485 RPM<\/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\">Shaft Torque<\/div><div class=\"vc-rcard-value\" id=\"vc-r-torque\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Shaft Power (Mechanical)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-pshaft\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Electrical Input Power<\/div><div class=\"vc-rcard-value\" id=\"vc-r-pelec\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Angular Velocity \u03c9<\/div><div class=\"vc-rcard-value\" id=\"vc-r-omega\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\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><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><h3>Current \u2192 Power \u2192 Torque Chain<\/h3><div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div><div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div><div class=\"vc-formula-box\" id=\"vc-katex-3\"><\/div><\/div><\/div><\/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\/three-phase-motor-power\/\">Three-Phase Power<\/a><a class=\"vc-related-link\" href=\"\/calculators\/motor-nameplate-current\/\">Nameplate Current<\/a><a class=\"vc-related-link\" href=\"\/calculators\/motor-starting-current\/\">Starting Current<\/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><\/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-torque-from-current';\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    function calculate(){\n        var I=parseFloat($('vc-current').value);var V=parseFloat($('vc-voltage').value);var n=parseFloat($('vc-speed').value);var pf=parseFloat($('vc-pf').value);var eff=parseFloat($('vc-eff').value);\n        if(!I||!V||!n||!pf||!eff||I<=0||V<=0||n<=0){$('vc-results').classList.remove('vc-visible');return}\n        var Pelec=Math.sqrt(3)*V*I*pf\/1000; \/\/ kW electrical input\n        var Pshaft=Pelec*eff; \/\/ kW mechanical output\n        var omega=2*Math.PI*n\/60;\n        var T=Pshaft*9549\/n; \/\/ Nm (= Pshaft*1000\/omega)\n        var Tlbft=T*0.7376;\n        $('vc-r-torque').innerHTML=fmt(T,1)+' <span class=\"vc-rcard-unit\">N\u00b7m<\/span> <span class=\"vc-rcard-unit\">('+fmt(Tlbft,1)+' lb\u00b7ft)<\/span>';\n        $('vc-r-pshaft').innerHTML=fmt(Pshaft,2)+' <span class=\"vc-rcard-unit\">kW<\/span>';\n        $('vc-r-pelec').innerHTML=fmt(Pelec,2)+' <span class=\"vc-rcard-unit\">kW<\/span>';\n        $('vc-r-omega').innerHTML=fmt(omega,2)+' <span class=\"vc-rcard-unit\">rad\/s<\/span>';\n        $('vc-results').classList.add('vc-visible');\n        saveHistory({I:I,V:V,n:n,T:fmt(T,1),_summary:I+'A @ '+n+' RPM \u2192 '+fmt(T,1)+' N\u00b7m'});\n    }\n    document.querySelectorAll('.vc-preset-btn').forEach(function(b){b.addEventListener('click',function(e){e.preventDefault();$('vc-current').value=this.getAttribute('data-i');$('vc-voltage').value=this.getAttribute('data-v');$('vc-speed').value=this.getAttribute('data-n');$('vc-pf').value=this.getAttribute('data-pf');$('vc-eff').value=this.getAttribute('data-eff');calculate()})});\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n    $('vc-copy-btn').addEventListener('click',function(){var t='Motor Torque\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nTorque: '+$('vc-r-torque').textContent+'\\nShaft Power: '+$('vc-r-pshaft').textContent+'\\nElec Input: '+$('vc-r-pelec').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).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';setTimeout(function(){b.classList.remove('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'},2000)})}});\n    document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});\n    var faqData=[{q:'How do I calculate motor torque from current?',a:'<p>P_elec = \u221a3\u00d7V\u00d7I\u00d7cos\u03c6. P_shaft = P_elec \u00d7 \u03b7. T = P_shaft \u00d7 9549 \/ n (N\u00b7m).<\/p>'},{q:'What is the 9549 constant?',a:'<p>From T = P\/\u03c9: T = P_kW \u00d7 1000 \/ (2\u03c0n\/60) = P_kW \u00d7 9549 \/ n.<\/p>'},{q:'Rated vs starting torque?',a:'<p>Rated = continuous at full load. Starting (locked rotor) = 150\u2013300% of rated for standard induction motors.<\/p>'},{q:'How does speed affect torque?',a:'<p>Constant power: T \u221d 1\/n. Below base speed (VFD, const V\/f): torque roughly constant. Above base speed: torque drops as 1\/n.<\/p>'},{q:'Shaft torque vs air-gap torque?',a:'<p>Air-gap = electromagnetic torque. Shaft = lower due to friction\/windage. T_shaft = P_output \u00d7 9549 \/ n.<\/p>'}];\n    var fl=$('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{\n        katex.render('P_{elec} = \\\\sqrt{3} \\\\times V \\\\times I \\\\times \\\\cos\\\\varphi \\\\quad [\\\\text{kW}]',$('vc-katex-1'),{displayMode:true,throwOnError:false});\n        katex.render('P_{shaft} = P_{elec} \\\\times \\\\eta \\\\quad [\\\\text{kW}]',$('vc-katex-2'),{displayMode:true,throwOnError:false});\n        katex.render('T = \\\\frac{P_{shaft} \\\\times 9549}{n} \\\\quad [\\\\text{N\u00b7m}]',$('vc-katex-3'),{displayMode:true,throwOnError:false});\n    }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>Calculadora online gratuita de torque de motores. Converta corrente em pot\u00eancia e torque: T = P \u00d7 9549 \/ n. C\u00e1lculo em cadeia: I \u2192 P \u2192 T para motores trif\u00e1sicos.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100163","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator\/100163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator\/100163\/revisions"}],"predecessor-version":[{"id":100936,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator\/100163\/revisions\/100936"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/media?parent=100163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/categories?post=100163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/tags?post=100163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}