{"id":66748,"date":"2026-10-13T08:53:29","date_gmt":"2026-10-13T05:53:29","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66748"},"modified":"2026-10-13T08:53:29","modified_gmt":"2026-10-13T05:53:29","slug":"battery-mah-to-wh-converter","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/battery-mah-to-wh-converter\/","title":{"rendered":"Battery mAh to Wh Converter"},"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\">Convert Battery Capacity from mAh to Watt-Hours<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66748\" data-favorite-title=\"mAh to Wh\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/battery-mah-to-wh-converter\/\" data-favorite-excerpt=\"Convert a battery&#039;s capacity from mAh (or Ah) to watt-hours by entering the charge rating and the nominal voltage. Useful for comparing batteries, estimating runtime, and checking airline lithium-battery limits.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-physic\">\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\/converters\/battery-mah-to-wh-converter\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66748\" data-post=\"66748\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Battery Capacity (C)<\/label><div class=\"term\">C<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"battery_capacity_c\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.0001\" value=\"5000\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"capacity_unit\" aria-label=\"Capacity unit\"><option value=\"mah\" selected>mAh<\/option><option value=\"ah\">Ah<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-1\">Charge capacity printed on the battery or its data sheet<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Nominal Voltage (V)<\/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=\"nominal_voltage_v\" id=\"field-3\" aria-describedby=\"calc-unit-3 calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.01\" value=\"3.7\"\/><div class=\"unit\" id=\"calc-unit-3\">V<\/div><small id=\"calc-info-3\">Typical values: 1.2 V (NiMH), 1.5 V (alkaline), 3.7 V (Li-ion), 7.4 V (2S Li-ion)<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66748\">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> Conversion Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Energy<\/span><span class=\"result-term\">E<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"Wh\"><\/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>Capacity in Amp-Hours<\/span><span class=\"result-term\">C<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"Ah\"><\/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 is-column\" id=\"output-3\"><span class=\"field-title\"><span>Calculation Details<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/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=\"66748\" 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\">0<\/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\">0<\/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>mAh to Wh 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\\[ E = C \\times V \\]\n\\[ E = \\frac{C_{\\text{mAh}}}{1000} \\times V \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(E\\) \u2014 energy in watt-hours (Wh)<\/li>\n<li>\\(C\\) \u2014 charge capacity in amp-hours (Ah); if the rating is in mAh, divide by 1000 first<\/li>\n<li>\\(V\\) \u2014 nominal voltage of the battery (V)<\/li>\n<\/ul>\n<p>The formula multiplies the charge a battery can deliver by its voltage, converting a charge rating (mAh) into the actual amount of stored energy (Wh).<\/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>mAh to Wh \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a typical power-bank cell rated at 5000 mAh with a nominal voltage of 3.7 V.<\/p>\n<p>\\[ C = \\frac{5000\\ \\text{mAh}}{1000} = 5\\ \\text{Ah} \\]<\/p>\n<p>\\[ E = 5\\ \\text{Ah} \\times 3.7\\ \\text{V} = 18.5\\ \\text{Wh} \\]<\/p>\n<p><strong>Result:<\/strong> the battery stores 18.5 Wh of energy.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Enter the charge capacity printed on the battery or its data sheet in the <strong>Battery Capacity (C)<\/strong> field.<\/li>\n<li>Choose the matching unit \u2014 <strong>mAh<\/strong> or <strong>Ah<\/strong> \u2014 from the dropdown next to the input field.<\/li>\n<li>Enter the battery's nominal voltage in the <strong>Nominal Voltage (V)<\/strong> field (e.g. 1.2 V for NiMH, 3.7 V for a single Li-ion cell, 7.4 V for a 2S Li-ion pack).<\/li>\n<li>Read the <strong>Energy<\/strong> result in watt-hours (Wh) and the <strong>Capacity in Amp-Hours<\/strong> result, along with a step-by-step breakdown in <strong>Calculation Details<\/strong>.<\/li>\n<\/ol>\n<h2>What mAh and Wh Actually Measure<\/h2>\n<p>Milliamp-hours (mAh) describe <em>charge<\/em>: how much electric current a battery can supply over time. A 5000 mAh cell can, in theory, deliver 5 A for one hour or 0.5 A for ten hours. But charge alone does not tell you how much <em>energy<\/em> the battery holds, because energy depends on the voltage at which that charge is delivered.<\/p>\n<p>Watt-hours (Wh) describe <em>energy<\/em>: power multiplied by time. One watt-hour is the energy consumed by a 1 W device running for one hour. Since power equals current times voltage, energy equals charge (Ah) times voltage (V) \u2014 which is exactly what this calculator computes. If you need to convert between related units, our <a href=\"https:\/\/wpcalc.com\/en\/converters\/power-unit-converter\/\">power unit converter<\/a> handles watts, kilowatts, and other power units, and the <a href=\"https:\/\/wpcalc.com\/en\/converters\/time-units-converter\/\">time unit converter<\/a> helps when working out runtime figures.<\/p>\n<p>This distinction matters when comparing batteries. Two power banks both rated at 10,000 mAh are not equal if one is a 3.7 V single-cell design (37 Wh) and the other a 7.4 V two-cell design (74 Wh). The second stores twice the energy. Marketing numbers usually quote mAh because they look bigger, but Wh is the honest, voltage-independent measure of what a battery can do.<\/p>\n<p>Wh is also the unit regulators use. Airline rules for lithium batteries are stated in watt-hours: typically up to 100 Wh is allowed in carry-on baggage without approval, and 100\u2013160 Wh requires airline approval. To check whether your power bank or spare battery is within the limit, convert its mAh rating to Wh with this calculator.<\/p>\n<h2>Typical Nominal Voltages by Chemistry<\/h2>\n<table>\n<thead>\n<tr>\n<th>Battery type<\/th>\n<th>Nominal voltage<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Alkaline cell (AA\/AAA)<\/td>\n<td>1.5 V<\/td>\n<\/tr>\n<tr>\n<td>NiMH rechargeable<\/td>\n<td>1.2 V<\/td>\n<\/tr>\n<tr>\n<td>Li-ion \/ LiPo single cell<\/td>\n<td>3.7 V (3.6\u20133.85 V depending on chemistry)<\/td>\n<\/tr>\n<tr>\n<td>LiFePO4 single cell<\/td>\n<td>3.2 V<\/td>\n<\/tr>\n<tr>\n<td>2S Li-ion pack<\/td>\n<td>7.4 V<\/td>\n<\/tr>\n<tr>\n<td>3S Li-ion pack<\/td>\n<td>11.1 V<\/td>\n<\/tr>\n<tr>\n<td>Lead-acid (6-cell)<\/td>\n<td>12 V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If the voltage is not printed on the battery, check the data sheet or the device's charging specification. For multi-cell packs, the nominal voltage is the single-cell voltage multiplied by the number of cells in series.<\/p>\n<h2>Assumptions and Limitations<\/h2>\n<ul>\n<li><strong>Nominal voltage is used, not the full discharge curve.<\/strong> A Li-ion cell actually swings from about 4.2 V down to 3.0 V during discharge. The nominal voltage (3.7 V) is an average, so the calculated Wh is a good approximation, not an exact measurement.<\/li>\n<li><strong>Rated capacity assumes specific conditions.<\/strong> Manufacturers quote mAh at a standard discharge current and temperature. Real usable capacity is lower at high loads, low temperatures, or when the device cuts off before the battery is fully drained.<\/li>\n<li><strong>Conversion losses are not included.<\/strong> If a power bank boosts 3.7 V up to 5 V to charge a phone, roughly 10\u201320% of the energy is lost in the conversion circuitry. A 37 Wh power bank will deliver around 30 Wh to your device.<\/li>\n<li><strong>Use the battery's own voltage, not the output voltage.<\/strong> If a power bank is rated \"10,000 mAh at 3.7 V\", the mAh figure refers to the internal cell \u2014 enter 3.7 V. Some brands advertise mAh at 5 V, which inflates the number; when in doubt, compute Wh and compare those.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Convert a battery's capacity from mAh (or Ah) to watt-hours by entering the charge rating and the nominal voltage. Useful for comparing batteries, estimating runtime, and checking airline lithium-battery limits.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[34],"class_list":["post-66748","post","type-post","status-publish","format-standard","hentry","category-converters","tag-physics-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66748","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\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=66748"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66748\/revisions"}],"predecessor-version":[{"id":66749,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66748\/revisions\/66749"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}