{"id":2256,"date":"2026-01-29T23:36:53","date_gmt":"2026-01-29T21:36:53","guid":{"rendered":"https:\/\/nature-o.net\/?page_id=2256"},"modified":"2026-02-02T17:25:23","modified_gmt":"2026-02-02T15:25:23","slug":"monthly-energy-bill-calculator","status":"publish","type":"page","link":"https:\/\/nature-o.net\/?page_id=2256","title":{"rendered":"Monthly Energy Bill Calculator"},"content":{"rendered":"\n<div class=\"eco-tool wp-block-group\" id=\"eco-tool-bill3-52f8c\">\n  <div class=\"eco-tool__header\">\n    <h2 class=\"eco-tool__title\">Monthly Energy Bill Calculator (3-Tariff)<\/h2>\n    <p class=\"eco-tool__lead\">\n      Estimate your monthly electricity bill using a 3-tariff scheme (Night, Day, Peak) and your usage split.\n    <\/p>\n  <\/div>\n\n  <form class=\"eco-tool__form\" id=\"eco-bill3-form-52f8c\" novalidate>\n    <div class=\"eco-tool__grid3\">\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-kwh-52f8c\">Monthly usage<br>(kWh)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-kwh-52f8c\" type=\"number\" min=\"0\" step=\"10\" value=\"350\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Total electricity consumption per month.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-cur-52f8c\">Currency<br>(display)<\/label>\n        <select class=\"eco-tool__input\" id=\"eco-b3-cur-52f8c\">\n          <option value=\"$\">$<\/option>\n          <option value=\"\u20ac\" selected>\u20ac<\/option>\n          <option value=\"\u00a3\">\u00a3<\/option>\n          <option value=\"\u20bd\">\u20bd<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">Only affects formatting.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\">Quick split preset<\/label>\n        <div class=\"eco-tool__presets\">\n          <button type=\"button\" class=\"eco-tool__chip\" data-split=\"balanced\">Balanced<\/button>\n          <button type=\"button\" class=\"eco-tool__chip\" data-split=\"nightheavy\">Night-heavy<\/button>\n          <button type=\"button\" class=\"eco-tool__chip\" data-split=\"peakheavy\">Peak-heavy<\/button>\n        <\/div>\n        <div class=\"eco-tool__hint\">Fills usage split percentages automatically.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-nightp-52f8c\">Night tariff price<br>(per kWh)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-nightp-52f8c\" type=\"number\" min=\"0\" step=\"0.01\" value=\"0.15\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Typically the cheapest rate.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-dayp-52f8c\">Day tariff price<br>(per kWh)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-dayp-52f8c\" type=\"number\" min=\"0\" step=\"0.01\" value=\"0.22\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Standard daytime rate.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-peakp-52f8c\">Peak tariff price<br>(per kWh)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-peakp-52f8c\" type=\"number\" min=\"0\" step=\"0.01\" value=\"0.30\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Most expensive \u201cpeak\u201d hours rate.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-nightpct-52f8c\">Night share<br>(%)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-nightpct-52f8c\" type=\"number\" min=\"0\" max=\"100\" step=\"1\" value=\"30\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">How much of your usage happens at night.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-daypct-52f8c\">Day share<br>(%)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-daypct-52f8c\" type=\"number\" min=\"0\" max=\"100\" step=\"1\" value=\"55\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Typical daytime share.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-b3-peakpct-52f8c\">Peak share<br>(%)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-b3-peakpct-52f8c\" type=\"number\" min=\"0\" max=\"100\" step=\"1\" value=\"15\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Evening or peak-hour share.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__actions\">\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn\" id=\"eco-b3-calc-52f8c\">Calculate<\/button>\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn eco-tool__btn--ghost\" id=\"eco-b3-reset-52f8c\">Reset<\/button>\n      <div class=\"eco-tool__error\" id=\"eco-b3-error-52f8c\" aria-live=\"polite\"><\/div>\n    <\/div>\n  <\/form>\n\n  <div class=\"eco-tool__result\" id=\"eco-b3-result-52f8c\" hidden>\n    <h3 class=\"eco-tool__subtitle\">Result<\/h3>\n\n    <div class=\"eco-tool__cards\">\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Total monthly bill<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-b3-total-52f8c\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-b3-avg-52f8c\">\u2014<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Breakdown<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-b3-break-52f8c\">\u2014<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__card eco-tool__card--wide\">\n      <div class=\"eco-tool__metric-label\">Simple idea to save<\/div>\n      <div class=\"eco-tool__metric-sub\" id=\"eco-b3-tip-52f8c\">\u2014<\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<style>\n.eco-tool{border:1px solid rgba(0,0,0,.12);border-radius:12px;padding:16px}\n.eco-tool__header{margin-bottom:12px}\n.eco-tool__title{margin:0 0 8px}\n.eco-tool__lead{margin:0;opacity:.9}\n\n.eco-tool__grid3{display:grid;grid-template-columns:1fr;gap:16px;margin-top:12px}\n@media(min-width:860px){.eco-tool__grid3{grid-template-columns:1fr 1fr 1fr}}\n\n.eco-tool__field{display:flex;flex-direction:column;gap:6px}\n.eco-tool__label{font-weight:600}\n.eco-tool__input{width:100%;height:44px;padding:0 12px;border:1px solid rgba(0,0,0,.2);border-radius:10px;background:#fff;box-sizing:border-box;font:inherit}\n.eco-tool__hint{font-size:.92em;opacity:.78;min-height:38px}\n\n.eco-tool__presets{display:flex;flex-wrap:wrap;gap:8px;padding:10px 12px;border:1px solid rgba(0,0,0,.12);border-radius:10px;background:rgba(0,0,0,.02)}\n.eco-tool__chip{border:1px solid rgba(0,0,0,.18);background:transparent;border-radius:999px;padding:6px 10px;cursor:pointer;font:inherit}\n.eco-tool__chip:hover,.eco-tool__chip:focus{background:rgba(0,0,0,.06);border-color:rgba(0,0,0,.30)}\n\n.eco-tool__actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:16px}\n.eco-tool__btn{padding:10px 22px}\n.eco-tool__btn--ghost{background:transparent!important;border:1px solid rgba(0,0,0,.2)!important}\n.eco-tool__btn--ghost:hover,.eco-tool__btn--ghost:focus{background:rgba(0,0,0,.06)!important;border-color:rgba(0,0,0,.35)!important}\n.eco-tool__error{min-height:1.2em;font-weight:600;flex:1 1 240px}\n\n.eco-tool__result{margin-top:16px}\n.eco-tool__subtitle{margin:0 0 10px}\n.eco-tool__cards{display:grid;gap:10px;grid-template-columns:1fr}\n@media(min-width:860px){.eco-tool__cards{grid-template-columns:1fr 1fr}}\n.eco-tool__card{border:1px solid rgba(0,0,0,.12);border-radius:12px;padding:12px}\n.eco-tool__card--wide{margin-top:10px}\n.eco-tool__metric-label{opacity:.85;font-weight:600}\n.eco-tool__metric-value{font-size:1.7em;font-weight:900;margin-top:6px;line-height:1.1}\n.eco-tool__metric-sub{opacity:.85;margin-top:6px}\n<\/style>\n\n<script>\n(function(){\n  const S=\"52f8c\";\n  const el=(id)=>document.getElementById(id+\"-\"+S);\n\n  const kwhEl=el(\"eco-b3-kwh\");\n  const curEl=el(\"eco-b3-cur\");\n\n  const nightPEl=el(\"eco-b3-nightp\");\n  const dayPEl=el(\"eco-b3-dayp\");\n  const peakPEl=el(\"eco-b3-peakp\");\n\n  const nightPctEl=el(\"eco-b3-nightpct\");\n  const dayPctEl=el(\"eco-b3-daypct\");\n  const peakPctEl=el(\"eco-b3-peakpct\");\n\n  const calcBtn=el(\"eco-b3-calc\");\n  const resetBtn=el(\"eco-b3-reset\");\n  const errEl=el(\"eco-b3-error\");\n\n  const resEl=el(\"eco-b3-result\");\n  const totalEl=el(\"eco-b3-total\");\n  const avgEl=el(\"eco-b3-avg\");\n  const breakEl=el(\"eco-b3-break\");\n  const tipEl=el(\"eco-b3-tip\");\n\n  const chips=[...document.querySelectorAll('#eco-tool-bill3-'+S+' .eco-tool__chip')];\n\n  function setErr(m){ errEl.textContent=m||\"\"; }\n  function n(v){ return Number(v); }\n\n  function money(x){\n    const sym=curEl.value||\"$\";\n    const v=Math.round(x*100)\/100;\n    return sym+v.toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2});\n  }\n\n  function applySplit(name){\n    \/\/ Simple, common patterns\n    if(name===\"balanced\"){\n      nightPctEl.value=\"30\"; dayPctEl.value=\"55\"; peakPctEl.value=\"15\";\n    }\n    if(name===\"nightheavy\"){\n      nightPctEl.value=\"50\"; dayPctEl.value=\"40\"; peakPctEl.value=\"10\";\n    }\n    if(name===\"peakheavy\"){\n      nightPctEl.value=\"20\"; dayPctEl.value=\"50\"; peakPctEl.value=\"30\";\n    }\n  }\n\n  chips.forEach(btn=>{\n    btn.addEventListener(\"click\", function(){\n      applySplit(this.getAttribute(\"data-split\"));\n    });\n  });\n\n  function calculate(){\n    setErr(\"\");\n\n    const kwh=n(kwhEl.value);\n    const np=n(nightPEl.value);\n    const dp=n(dayPEl.value);\n    const pp=n(peakPEl.value);\n\n    const nPct=n(nightPctEl.value);\n    const dPct=n(dayPctEl.value);\n    const pPct=n(peakPctEl.value);\n\n    if(!Number.isFinite(kwh)||kwh<0){ setErr(\"Please enter monthly usage (0 or more).\"); resEl.hidden=true; return; }\n    if(![np,dp,pp].every(x=>Number.isFinite(x)&&x>=0)){ setErr(\"Please enter valid non-negative prices for all tariffs.\"); resEl.hidden=true; return; }\n    if(![nPct,dPct,pPct].every(x=>Number.isFinite(x)&&x>=0&&x<=100)){ setErr(\"Please enter valid percentages (0\u2013100).\"); resEl.hidden=true; return; }\n\n    const sumPct = nPct + dPct + pPct;\n    if(Math.abs(sumPct - 100) > 0.001){\n      setErr(`Percentages must add up to 100%. Current total: ${Math.round(sumPct)}%.`);\n      resEl.hidden=true;\n      return;\n    }\n\n    const nKwh = kwh * (nPct\/100);\n    const dKwh = kwh * (dPct\/100);\n    const pKwh = kwh * (pPct\/100);\n\n    const nCost = nKwh*np;\n    const dCost = dKwh*dp;\n    const pCost = pKwh*pp;\n\n    const total = nCost + dCost + pCost;\n    const avg = kwh>0 ? total\/kwh : 0;\n\n    totalEl.textContent = money(total);\n    avgEl.textContent = `Average price: ${money(avg)} per kWh`;\n\n    breakEl.innerHTML =\n      `<div>Night: <strong>${Math.round(nKwh).toLocaleString()} kWh<\/strong> \u2192 ${money(nCost)}<\/div>` +\n      `<div>Day: <strong>${Math.round(dKwh).toLocaleString()} kWh<\/strong> \u2192 ${money(dCost)}<\/div>` +\n      `<div>Peak: <strong>${Math.round(pKwh).toLocaleString()} kWh<\/strong> \u2192 ${money(pCost)}<\/div>`;\n\n    \/\/ Simple tip: shifting 10% of peak to night\n    const shift = Math.min(pKwh, kwh*0.10);\n    const save = shift*(pp-np);\n    if(save > 0.01){\n      tipEl.textContent = `If you shift ~10% of total usage from Peak to Night, you could save about ${money(save)} per month (estimate).`;\n    } else {\n      tipEl.textContent = `If your peak price is close to night price, shifting usage may not change the bill much.`;\n    }\n\n    resEl.hidden=false;\n  }\n\n  function reset(){\n    setErr(\"\");\n    kwhEl.value=\"350\";\n    curEl.value=\"\u20ac\";\n    nightPEl.value=\"0.15\";\n    dayPEl.value=\"0.22\";\n    peakPEl.value=\"0.30\";\n    applySplit(\"balanced\");\n    resEl.hidden=true;\n  }\n\n  calcBtn.addEventListener(\"click\", calculate);\n  resetBtn.addEventListener(\"click\", reset);\n})();\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>Monthly Energy Bill Calculator (3-Tariff) Estimate your monthly electricity bill using a 3-tariff scheme (Night, Day, Peak) and your usage split. Monthly usage(kWh) Total electricity consumption per month. Currency(display) $\u20ac\u00a3\u20bd&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2452,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"_links":{"self":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2256"}],"collection":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nature-o.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2256"}],"version-history":[{"count":3,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2256\/revisions"}],"predecessor-version":[{"id":2271,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2256\/revisions\/2271"}],"up":[{"embeddable":true,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2452"}],"wp:attachment":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}