{"id":116,"date":"2026-08-19T23:50:04","date_gmt":"2026-08-19T23:50:04","guid":{"rendered":"https:\/\/netguide.io\/tools\/ups-runtime-calculator\/"},"modified":"2026-08-19T23:50:04","modified_gmt":"2026-08-19T23:50:04","slug":"ups-runtime-calculator","status":"publish","type":"post","link":"https:\/\/netguide.io\/tools\/en\/ups-runtime-calculator\/","title":{"rendered":"UPS Runtime Calculator"},"content":{"rendered":"<div id=\"netgu-3805342655\" class=\"netgu-before-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"3494115342\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n<style>\n.wp-up-container { max-width:100%; background:#fff; padding:20px; border:1px solid #ddd; border-radius:10px; font-family:-apple-system, sans-serif; color:#333; }\n.wp-up-title { margin:0 0 15px 0; color:#2271b1; font-size:1.4rem; }\n.wp-up-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(140px, 1fr)); gap:12px; margin-bottom:10px; }\n.wp-up-input-group label { display:block; font-size:11px; font-weight:bold; margin-bottom:4px; text-transform:uppercase; color:#666; }\n.wp-up-input-group input, .wp-up-input-group select { width:100%; padding:8px; border:1px solid #ccc; border-radius:4px; box-sizing:border-box; }\n.wp-up-checkbox-group { margin:15px 0; font-size:12px; display:flex; align-items:center; gap:8px; color:#666; }\n.wp-up-note { font-size:12px; color:#666; margin-top:12px; min-height:1em; }\n.wp-up-warn { color:#d63638; font-weight:bold; }\n.wp-up-results { margin-top:20px; border-top:2px solid #eee; padding-top:15px; }\n.wp-up-res-item { display:flex; justify-content:space-between; margin-bottom:6px; font-size:14px; gap:10px; }\n.wp-up-total { font-weight:bold; font-size:18px; color:#2271b1; margin:10px 0; padding:5px 0; border-top:1px solid #eee; border-bottom:1px solid #eee; }\n.wp-up-val { color:#2271b1; font-weight:bold; }\n.wp-up-out { width:100%; box-sizing:border-box; padding:10px; border:1px solid #ccc; border-radius:4px; font-family:monospace; font-size:13px; word-break:break-all; background:#f7f7f7; margin-top:6px; }\n.wp-up-btn { background:#2271b1; color:#fff; border:none; padding:9px 14px; border-radius:4px; cursor:pointer; font-size:13px; margin-top:10px; }\n<\/style>\n<div class=\"wp-up-container\">\n  <h3 class=\"wp-up-title\">UPS Runtime Calculator<\/h3>\n  <div class=\"wp-up-grid\">\n    <div class=\"wp-up-input-group\"><label>Battery voltage (V)<\/label><input type=\"number\" id=\"up-volt\" value=\"12\" min=\"0\" step=\"1\" oninput=\"calcUps()\"><\/div>\n    <div class=\"wp-up-input-group\"><label>Capacity (Ah)<\/label><input type=\"number\" id=\"up-ah\" value=\"7\" min=\"0\" step=\"0.1\" oninput=\"calcUps()\"><\/div>\n    <div class=\"wp-up-input-group\"><label>Number of batteries<\/label><input type=\"number\" id=\"up-batt\" value=\"1\" min=\"1\" step=\"1\" oninput=\"calcUps()\"><\/div>\n    <div class=\"wp-up-input-group\"><label>Efficiency (%)<\/label><input type=\"number\" id=\"up-eff\" value=\"90\" min=\"1\" max=\"100\" step=\"1\" oninput=\"calcUps()\"><\/div>\n    <div class=\"wp-up-input-group\"><label>Load (watts)<\/label><input type=\"number\" id=\"up-load\" value=\"100\" min=\"0\" step=\"1\" oninput=\"calcUps()\"><\/div>\n  <\/div>\n  <div class=\"wp-up-results\">\n    <div class=\"wp-up-res-item\"><span>Battery capacity:<\/span><span id=\"up-wh\">0 Wh<\/span><\/div>\n    <div class=\"wp-up-res-item\"><span>Usable (after efficiency):<\/span><span id=\"up-usable\">0 Wh<\/span><\/div>\n    <div class=\"wp-up-res-item wp-up-total\"><span>Estimated runtime:<\/span><span id=\"up-min\">0 min<\/span><\/div>\n    <div class=\"wp-up-res-item\"><span>Equals:<\/span><span id=\"up-hm\">0 h 0 min<\/span><\/div>\n  <\/div>\n  <div class=\"wp-up-note\">Estimate only. Real runtime is usually shorter due to the Peukert effect (higher load discharges disproportionately).<\/div>\n<\/div>\n<script>\nfunction calcUps(){\n  var v=parseFloat(document.getElementById('up-volt').value)||0;\n  var ah=parseFloat(document.getElementById('up-ah').value)||0;\n  var n=parseFloat(document.getElementById('up-batt').value)||1;\n  var eff=parseFloat(document.getElementById('up-eff').value)||0;\n  var load=parseFloat(document.getElementById('up-load').value)||0;\n  var wh=v*ah*n, usable=wh*(eff\/100);\n  var mins= load>0 ? usable\/load*60 : 0;\n  var hh=Math.floor(mins\/60), mm=Math.round(mins-hh*60);\n  document.getElementById('up-wh').innerText=wh.toFixed(0)+' Wh';\n  document.getElementById('up-usable').innerText=usable.toFixed(0)+' Wh';\n  document.getElementById('up-min').innerText=mins.toFixed(0)+' min';\n  document.getElementById('up-hm').innerText=hh+' h '+mm+' min';\n}\ncalcUps();\n<\/script>\n\n\n<div id=\"netgu-1616502036\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- NetGuide.io-After-Widget-Tools -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-6258556257245998\"\r\n     data-ad-slot=\"5175852350\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How the UPS runtime calculator works<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The calculator estimates how long a UPS (uninterruptible power supply) will bridge your devices during an outage. The basis is the energy stored in the batteries in watt-hours, divided by the applied load.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Battery voltage \u00d7 capacity:<\/strong> A 12 V battery with 7 Ah stores 84 Wh. Multiple batteries are added up.<\/li>\n\n\n<li><strong>Efficiency:<\/strong> The inverter and cabling cost energy; 85\u201395% is realistic (default 90%).<\/li>\n\n\n<li><strong>Load (watts):<\/strong> The real active power of the connected devices \u2013 not the UPS&#8217;s VA rating.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Important:<\/strong> The result is an upper bound. Lead-acid batteries deliver less under high load (Peukert effect), and should not be fully discharged. For critical systems, plan generous reserves.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Related calculators<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/tools\/en\/electricity-cost-calculator\/\">Electricity Cost Calculator<\/a><\/li>\n\n\n<li><a href=\"\/tools\/en\/raid-calculator\/\">RAID Calculator<\/a><\/li>\n<\/ul>\n\n\n<div id=\"netgu-309488060\" class=\"netgu-after-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"4559785002\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Estimate a UPS runtime from battery voltage, capacity (Ah), efficiency and load in watts. Result in minutes and hours.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[158],"tags":[],"class_list":["post-116","post","type-post","status-publish","format-standard","hentry","category-rechner-calculator-en"],"brizy_media":[],"_links":{"self":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts\/116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/comments?post=116"}],"version-history":[{"count":0,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts\/116\/revisions"}],"wp:attachment":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/media?parent=116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/categories?post=116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/tags?post=116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}