{"id":127,"date":"2026-08-20T17:31:57","date_gmt":"2026-08-20T17:31:57","guid":{"rendered":"https:\/\/netguide.io\/tools\/poe-power-budget-calculator\/"},"modified":"2026-08-20T17:31:57","modified_gmt":"2026-08-20T17:31:57","slug":"poe-power-budget-calculator","status":"publish","type":"post","link":"https:\/\/netguide.io\/tools\/en\/poe-power-budget-calculator\/","title":{"rendered":"PoE Power Budget Calculator"},"content":{"rendered":"<div id=\"netgu-1502453841\" 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-poe-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-poe-title { margin:0 0 15px 0; color:#2271b1; font-size:1.4rem; }\n.wp-poe-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(140px, 1fr)); gap:12px; margin-bottom:10px; }\n.wp-poe-input-group label { display:block; font-size:11px; font-weight:bold; margin-bottom:4px; text-transform:uppercase; color:#666; }\n.wp-poe-input-group input, .wp-poe-input-group select { width:100%; padding:8px; border:1px solid #ccc; border-radius:4px; box-sizing:border-box; }\n.wp-poe-checkbox-group { margin:15px 0; font-size:12px; display:flex; align-items:center; gap:8px; color:#666; }\n.wp-poe-note { font-size:12px; color:#666; margin-top:12px; min-height:1em; }\n.wp-poe-warn { color:#d63638; font-weight:bold; }\n.wp-poe-results { margin-top:20px; border-top:2px solid #eee; padding-top:15px; }\n.wp-poe-res-item { display:flex; justify-content:space-between; margin-bottom:6px; font-size:14px; gap:10px; }\n.wp-poe-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-poe-val { color:#2271b1; font-weight:bold; }\n.wp-poe-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-poe-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-poe-container\">\n  <h3 class=\"wp-poe-title\">PoE Power Budget Calculator<\/h3>\n  <div class=\"wp-poe-grid\">\n    <div class=\"wp-poe-input-group\"><label>Switch PoE budget (W)<\/label><input type=\"number\" id=\"poe-budget\" value=\"370\" min=\"0\" step=\"1\" oninput=\"calcPoe()\"><\/div>\n    <div class=\"wp-poe-input-group\"><label>PoE standard<\/label><select id=\"poe-std\" onchange=\"poeSet()\">\n      <option value=\"custom\">Custom value<\/option>\n      <option value=\"af\">802.3af (PoE) \u2013 15,4 W<\/option>\n      <option value=\"at\" selected>802.3at (PoE+) \u2013 30 W<\/option>\n      <option value=\"bt3\">802.3bt Typ 3 \u2013 60 W<\/option>\n      <option value=\"bt4\">802.3bt Typ 4 \u2013 90 W<\/option>\n    <\/select><\/div>\n    <div class=\"wp-poe-input-group\"><label>Number of devices<\/label><input type=\"number\" id=\"poe-count\" value=\"8\" min=\"0\" step=\"1\" oninput=\"calcPoe()\"><\/div>\n    <div class=\"wp-poe-input-group\"><label>Power per device (W)<\/label><input type=\"number\" id=\"poe-watt\" value=\"30\" min=\"0\" step=\"0.1\" oninput=\"calcPoe()\"><\/div>\n  <\/div>\n  <div class=\"wp-poe-results\">\n    <div class=\"wp-poe-res-item\"><span>Total load:<\/span><span id=\"poe-load\">0 W<\/span><\/div>\n    <div class=\"wp-poe-res-item\"><span>Free budget:<\/span><span id=\"poe-rem\">0 W<\/span><\/div>\n    <div class=\"wp-poe-res-item\"><span>Utilisation:<\/span><span id=\"poe-util\">0 %<\/span><\/div>\n    <div class=\"wp-poe-res-item wp-poe-total\"><span>Status:<\/span><span id=\"poe-status\">\u2014<\/span><\/div>\n    <div class=\"wp-poe-res-item\"><span>Max devices at this load:<\/span><span id=\"poe-max\">0<\/span><\/div>\n  <\/div>\n<\/div>\n<script>window.wpPoeL = {\"ok\":\"Fits \u2713\",\"over\":\"Overloaded \u2717\",\"devices\":\"devices\"};<\/script>\n<script>\nfunction poeSet(){\n  var s=document.getElementById('poe-std').value;\n  var map={af:15.4,at:30,bt3:60,bt4:90};\n  if(map[s]!==undefined){ document.getElementById('poe-watt').value=map[s]; }\n  calcPoe();\n}\nfunction calcPoe(){\n  var budget=parseFloat(document.getElementById('poe-budget').value)||0;\n  var count=parseInt(document.getElementById('poe-count').value)||0;\n  var watt=parseFloat(document.getElementById('poe-watt').value)||0;\n  var load=count*watt, rem=budget-load, util=budget>0?load\/budget*100:0;\n  var maxDev= watt>0?Math.floor(budget\/watt):0;\n  var L=window.wpPoeL||{};\n  document.getElementById('poe-load').innerText=load.toFixed(1)+' W';\n  document.getElementById('poe-rem').innerText=rem.toFixed(1)+' W';\n  document.getElementById('poe-util').innerText=util.toFixed(1)+' %';\n  document.getElementById('poe-max').innerText=maxDev+' '+(L.devices||'Geraete');\n  var st=document.getElementById('poe-status');\n  if(load<=budget){ st.innerText=L.ok||'Passt'; st.style.color='#2e7d32'; }\n  else { st.innerText=L.over||'Ueberlastet'; st.style.color='#d63638'; }\n}\ncalcPoe();\n<\/script>\n\n\n<div id=\"netgu-2427925607\"><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 PoE power budget calculator works<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Power over Ethernet (PoE) powers devices such as access points, IP cameras and VoIP phones over the network cable. But every switch has a limited total power budget. The calculator shows whether your devices fit and how much headroom remains.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>PoE budget:<\/strong> The total budget is in the switch datasheet (e.g. 370 W). It is usually lower than the sum of all per-port maxima.<\/li>\n\n\n<li><strong>PoE standard:<\/strong> 802.3af delivers up to 15.4 W, 802.3at (PoE+) 30 W, 802.3bt up to 60 W (Type 3) or 90 W (Type 4) per port at the switch.<\/li>\n\n\n<li><strong>Power per device:<\/strong> Real draw is often lower than the standard maximum \u2013 use the value from the end device's datasheet.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tip:<\/strong> Plan 10\u201320% headroom. Access points draw noticeably more under load (many clients, Wi-Fi 7) than when idle, and some switches throttle individual ports when the budget is exceeded.<\/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\/subnetz-ip-rechner\/\">Subnet & IP Calculator<\/a><\/li>\n\n\n<li><a href=\"\/tools\/en\/electricity-cost-calculator\/\">Electricity Cost Calculator<\/a><\/li>\n<\/ul>\n\n\n<div id=\"netgu-2086997351\" 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>Check a switch&#8217;s PoE power budget \u2013 total load, free budget, utilisation and the maximum number of devices per PoE standard (af\/at\/bt).<\/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 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