{"id":64425,"date":"2025-05-12T09:16:38","date_gmt":"2025-05-12T06:16:38","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=64425"},"modified":"2026-09-30T18:23:09","modified_gmt":"2026-09-30T15:23:09","slug":"kva-to-amps","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/engineering\/kva-to-amps\/","title":{"rendered":"KVA to Amps Calculator"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Electrical Power Conversion: kVA to Amps<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"64425\" data-favorite-title=\"KVA to Amps\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/engineering\/kva-to-amps\/\" data-favorite-excerpt=\"Convert apparent power in kilovolt-amperes (kVA) to current in amperes (A). Enter the power and voltage, and the calculator returns both single-phase and three-phase current.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-electrical\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/engineering\/kva-to-amps\/\" method=\"POST\" class=\"calculator\" id=\"calculator-64425\" data-post=\"64425\"><fieldset class=\"fieldset-input\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Power<\/label><div class=\"term\">kVA<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"power\" id=\"field-1\" aria-describedby=\"calc-unit-1 calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"10\"\/><div class=\"unit\" id=\"calc-unit-1\">kVA<\/div><small id=\"calc-info-1\">Apparent power in kilovolt-amperes<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Voltage<\/label><div class=\"term\">V<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"voltage\" id=\"field-2\" aria-describedby=\"calc-unit-2 calc-info-2\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"220\"\/><div class=\"unit\" id=\"calc-unit-2\">V<\/div><small id=\"calc-info-2\">Voltage in volts<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"64425\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Your Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Single Phase Current<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"A\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Three Phase Current<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"A\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"64425\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">1<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">1<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>kVA to Amps Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ I_{1\\phi} = \\frac{1000 \\cdot S}{V} \\\\ I_{3\\phi} = \\frac{1000 \\cdot S}{\\sqrt{3} \\cdot V} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(S\\) \u2014 apparent power (kVA)<\/li>\n<li>\\(V\\) \u2014 voltage (V)<\/li>\n<li>\\(I\\) \u2014 current (A)<\/li>\n<\/ul>\n<p>The first formula applies to single-phase systems; the second to three-phase systems, where the factor \\(\\sqrt{3} \\approx 1.732\\) accounts for the phase relationship between the three conductors.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>kVA to Amps \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a load with an apparent power of 10 kVA connected to a 220 V supply.<\/p>\n<p>Single phase:<\/p>\n<p>\\[ I = \\frac{1000 \\cdot 10}{220} = 45.45~\\mathrm{A} \\]<\/p>\n<p>Three phase (line-to-line voltage):<\/p>\n<p>\\[ I = \\frac{1000 \\cdot 10}{\\sqrt{3} \\cdot 220} = \\frac{10000}{381.05} \\approx 26.24~\\mathrm{A} \\]<\/p>\n<p><strong>Result:<\/strong> the single-phase current is approximately 45.45 A, and the three-phase current is approximately 26.24 A.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Enter the apparent power in the <strong>Power<\/strong> field, in kilovolt-amperes (kVA).<\/li>\n<li>Enter the <strong>Voltage<\/strong> in volts (V). For three-phase systems, use the line-to-line voltage.<\/li>\n<li>Read the results: the <strong>Single Phase Current<\/strong> and the <strong>Three Phase Current<\/strong>, both in amperes (A).<\/li>\n<\/ol>\n<p>Both currents are calculated at once, so you can compare the two system types for the same power and voltage. The voltage must be greater than zero \u2014 the calculator shows an error message otherwise.<\/p>\n<h2>What Are kVA and Amps?<\/h2>\n<p>kilovolt-amperes (kVA) measure <em>apparent power<\/em> \u2014 the total power that a source delivers to a load. Amperes (A) measure <em>current<\/em> \u2014 the flow of electric charge through the conductors. The two are related through voltage: for a fixed apparent power, a higher voltage means a lower current, and vice versa. Converting between them is a routine task when sizing generators, transformers, cables, and protective devices.<\/p>\n<p>Converting kVA to amps matters because electrical components are rated in amps, not in kVA. A circuit breaker, a cable's ampacity, and a busbar's capacity are all expressed as maximum current. Once you know the current drawn by a load, you can select conductors and protection with adequate margins. For example, a 10 kVA load on a single-phase 220 V line draws about 45.5 A, which already requires fairly heavy cable compared with a three-phase connection at the same power.<\/p>\n<p>The reason three-phase systems draw less current per unit of power is that the three phases share the load and are offset by 120\u00b0. The total three-phase power is \\(\\sqrt{3}\\) times the product of line voltage and line current, so the current is reduced by that same factor. This is why industrial equipment, motors, and large installations almost always use three-phase supply.<\/p>\n<p>Note that kVA is <em>apparent<\/em> power, not real power. Real power in kilowatts (kW) equals kVA multiplied by the power factor. Current calculated from kVA represents the full current the conductors must carry regardless of the load's power factor, which is exactly what you need for cable and breaker sizing. To work with real and reactive power instead, see the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/real-reactive-power\/\">Real and Reactive Power Calculator<\/a>.<\/p>\n<h2>Quick Reference Table<\/h2>\n<table>\n<thead>\n<tr>\n<th>kVA<\/th>\n<th>Current at 220 V, single-phase (A)<\/th>\n<th>Current at 400 V, three-phase (A)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>5<\/td>\n<td>22.73<\/td>\n<td>7.22<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>45.45<\/td>\n<td>14.43<\/td>\n<\/tr>\n<tr>\n<td>25<\/td>\n<td>113.64<\/td>\n<td>36.08<\/td>\n<\/tr>\n<tr>\n<td>50<\/td>\n<td>227.27<\/td>\n<td>72.17<\/td>\n<\/tr>\n<tr>\n<td>100<\/td>\n<td>454.55<\/td>\n<td>144.34<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Assumptions, Limitations and Practical Tips<\/h2>\n<ul>\n<li><strong>Line-to-line voltage for three-phase:<\/strong> the three-phase formula assumes the entered voltage is the line-to-line voltage (e.g. 400 V in Europe, 208 V or 480 V in North America). If you only know the line-to-neutral voltage, use the single-phase result for each phase conductor.<\/li>\n<li><strong>Resistive vs. reactive loads:<\/strong> the calculation is independent of the power factor because kVA already includes it. However, if you are starting from kW instead of kVA, divide by the power factor first to get kVA.<\/li>\n<li><strong>Margin for sizing:<\/strong> when selecting cables and breakers, add a safety margin above the calculated current (typically 20\u201325%) and account for motor starting currents, which can be several times the running current.<\/li>\n<li><strong>Voltage drop:<\/strong> long cable runs add voltage drop, which increases the current for the same power. Keep cable lengths short or upsize the conductors; once the current is known, the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/wire-gauge\/\">Wire Gauge Calculator<\/a> helps with conductor selection.<\/li>\n<li><strong>Transformer rating:<\/strong> transformer nameplates state kVA, so this conversion tells you the secondary current the transformer must deliver. For transformer-specific calculations, see the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/single-phase-transformer\/\">Single Phase Transformer Calculator<\/a>.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Convert apparent power in kilovolt-amperes (kVA) to current in amperes (A). Enter the power and voltage, and the calculator returns both single-phase and three-phase current.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[21],"class_list":["post-64425","post","type-post","status-publish","format-standard","hentry","category-engineering","tag-electrical"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/64425","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/70"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=64425"}],"version-history":[{"count":3,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/64425\/revisions"}],"predecessor-version":[{"id":65980,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/64425\/revisions\/65980"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=64425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=64425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=64425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}