{"id":273,"date":"2026-04-28T02:21:27","date_gmt":"2026-04-28T02:21:27","guid":{"rendered":"https:\/\/mydiyaddiction.com\/?page_id=273"},"modified":"2026-04-28T03:06:10","modified_gmt":"2026-04-28T03:06:10","slug":"led-resistor-calculator","status":"publish","type":"page","link":"https:\/\/mydiyaddiction.com\/?page_id=273","title":{"rendered":"LED Current Resistor Calculator"},"content":{"rendered":"<div class=\"entry\">\n\n\n<!-- LED Resistor Calculator for WordPress -->\n<div id=\"led-resistor-calculator\" style=\"max-width:700px;margin:30px auto;padding:25px;border:1px solid #ddd;border-radius:12px;font-family:Arial,sans-serif;background:#f9f9f9;box-shadow:0 4px 12px rgba(0,0,0,0.08);\">\n    \n    <h2 style=\"text-align:center;color:#222;\">LED Resistor Calculator<\/h2>\n    <p style=\"text-align:center;color:#555;\">Enter your supply voltage, LED voltage, and LED current to calculate the correct resistor value.<\/p>\n\n    <label><strong>Supply Voltage (V):<\/strong><\/label>\n    <input type=\"number\" id=\"supplyVoltage\" step=\"0.1\" placeholder=\"Example: 12\" style=\"width:100%;padding:10px;margin:8px 0 18px;border:1px solid #ccc;border-radius:6px;\">\n\n    <label><strong>LED Voltage (V):<\/strong><\/label>\n    <input type=\"number\" id=\"ledVoltage\" step=\"0.1\" placeholder=\"Example: 2.2\" style=\"width:100%;padding:10px;margin:8px 0 18px;border:1px solid #ccc;border-radius:6px;\">\n\n    <label><strong>LED Current (mA):<\/strong><\/label>\n    <input type=\"number\" id=\"ledCurrent\" step=\"1\" placeholder=\"Example: 20\" style=\"width:100%;padding:10px;margin:8px 0 18px;border:1px solid #ccc;border-radius:6px;\">\n\n    <button onclick=\"calculateLEDResistor()\" style=\"width:100%;padding:12px;background:#28a745;color:white;border:none;border-radius:8px;font-size:16px;cursor:pointer;\">\n        Calculate Resistor\n    <\/button>\n\n    <div id=\"result\" style=\"margin-top:25px;padding:15px;background:#fff;border-radius:8px;border:1px solid #ddd;display:none;\"><\/div>\n<\/div>\n\n<script>\nfunction calculateLEDResistor() {\n    let Vs = parseFloat(document.getElementById(\"supplyVoltage\").value);\n    let Vf = parseFloat(document.getElementById(\"ledVoltage\").value);\n    let I = parseFloat(document.getElementById(\"ledCurrent\").value) \/ 1000; \/\/ convert mA to A\n    let resultBox = document.getElementById(\"result\");\n\n    if (isNaN(Vs) || isNaN(Vf) || isNaN(I) || Vs <= 0 || Vf <= 0 || I <= 0) {\n        resultBox.style.display = \"block\";\n        resultBox.innerHTML = \"<span style='color:red;'>Please enter valid values.<\/span>\";\n        return;\n    }\n\n    if (Vf >= Vs) {\n        resultBox.style.display = \"block\";\n        resultBox.innerHTML = \"<span style='color:red;'>LED voltage must be lower than supply voltage.<\/span>\";\n        return;\n    }\n\n    let R = (Vs - Vf) \/ I;\n    let P = (Vs - Vf) * I;\n\n    resultBox.style.display = \"block\";\n    resultBox.innerHTML = `\n        <h3 style=\"margin-top:0;color:#222;\">Results<\/h3>\n        <p><strong>Required Resistor:<\/strong> ${R.toFixed(0)} \u03a9<\/p>\n        <p><strong>Nearest Standard Value:<\/strong> ${getNearestStandardResistor(R)} \u03a9<\/p>\n        <p><strong>Power Dissipation:<\/strong> ${P.toFixed(2)} W<\/p>\n        <p><strong>Recommended Wattage:<\/strong> ${getRecommendedWattage(P)}<\/p>\n    `;\n}\n\nfunction getNearestStandardResistor(value) {\n    const standard = [10,22,33,47,68,100,150,220,330,470,680,1000,1500,2200,3300,4700,6800,10000];\n    return standard.reduce((prev, curr) =>\n        Math.abs(curr - value) < Math.abs(prev - value) ? curr : prev\n    );\n}\n\nfunction getRecommendedWattage(power) {\n    if (power <= 0.125) return \"1\/4 Watt\";\n    if (power <= 0.25) return \"1\/2 Watt\";\n    if (power <= 0.5) return \"1 Watt\";\n    if (power <= 1) return \"2 Watt\";\n    return \"Use higher than 2 Watt\";\n}\n<\/script>\n\n\n<\/div>","protected":false},"excerpt":{"rendered":"<p>LED Resistor Calculator Enter your supply voltage, LED voltage, and LED current to calculate the correct resistor value. Supply Voltage (V): LED Voltage (V): LED Current (mA): Calculate Resistor<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-273","page","type-page","status-publish"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LED Current Resistor Calculator - MyDiyAddiction<\/title>\n<meta name=\"description\" content=\"A free LED resistor calculator to quickly find the correct resistor value based on supply voltage, LED voltage, and current.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mydiyaddiction.com\/?page_id=273\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LED Current Resistor Calculator - 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