{"id":100170,"date":"2026-02-15T20:22:12","date_gmt":"2026-02-15T20:22:12","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100170"},"modified":"2026-04-05T15:38:48","modified_gmt":"2026-04-05T15:38:48","slug":"noise-level-addition","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/noise-level-addition\/","title":{"rendered":"\u09b6\u09ac\u09cd\u09a6 \u09b8\u09cd\u09a4\u09b0 \u09b8\u0982\u09af\u09cb\u099c\u09a8 \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0 \u2014 dB \u0989\u09ce\u09b8 \u098f\u0995\u09a4\u09cd\u09b0\u09bf\u09a4 \u0995\u09b0\u09c1\u09a8 \u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Noise Level Addition Calculator\",\"description\":\"Sum up to 8 noise sources in dB\/dBA using logarithmic addition.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/noise-level-addition\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2025-02-14\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How do you add noise levels in dB?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Decibels are added logarithmically: L_total = 10 \u00d7 log10(10^(L1\/10) + 10^(L2\/10) + ...). You cannot simply add dB values arithmetically.\"}},\n{\"@type\":\"Question\",\"name\":\"What happens when you add two equal noise sources?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Two equal sources add 3 dB. For example, two 80 dB sources produce 83 dB combined. This is because 10\u00d7log10(2) \u2248 3.01.\"}},\n{\"@type\":\"Question\",\"name\":\"Does a quiet source matter next to a loud one?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If the difference is >10 dB, the quieter source adds less than 0.4 dB. At >15 dB difference, the contribution is negligible (<0.1 dB).\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between dB and dBA?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"dBA applies A-weighting that filters frequencies similar to human hearing. Low and very high frequencies are attenuated. dBA is used for most occupational noise measurements.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the occupational noise exposure limit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most standards set 85 dBA as the 8-hour exposure limit (e.g., OSHA, EU Directive 2003\/10\/EC). Above this level, hearing protection is mandatory.\"}}\n]}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Noise Level Addition\",\"item\":\"https:\/\/vibromera.eu\/calculators\/noise-level-addition\/\"}]}<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&#038;family=JetBrains+Mono:wght@400;500;600&#038;family=Fraunces:opsz,wght@9..144,700;9..144,800&#038;display=swap\" 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var(--vc-border);border-radius:var(--vc-radius);text-decoration:none;transition:all .15s}.vc-related-link:hover{border-color:var(--vc-accent);color:var(--vc-accent);background:var(--vc-accent-light)}.vc-promo{margin-top:24px;padding:20px;background:linear-gradient(135deg,var(--vc-accent-light),var(--vc-surface));border:1px solid var(--vc-border);border-radius:var(--vc-radius-lg);display:flex;align-items:center;gap:16px}.vc-promo-text{flex:1;font-size:14px;color:var(--vc-ink-secondary)}.vc-promo-text strong{color:var(--vc-ink)}.vc-promo-link{padding:8px 20px;font-size:13px;font-weight:700;color:#fff;background:var(--vc-accent);border-radius:var(--vc-radius);text-decoration:none;white-space:nowrap;transition:background .15s}.vc-promo-link:hover{background:var(--vc-accent-hover)}.vc-footer{text-align:center;padding:32px 16px;font-size:13px;color:var(--vc-ink-muted)}.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer a:hover{text-decoration:underline}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}.vc-viz{margin:20px 0;background:var(--vc-surface);border:1px solid var(--vc-border-light);border-radius:var(--vc-radius);padding:16px;overflow:hidden}.vc-viz svg{width:100%;height:auto;display:block}.vc-viz-title{font-family:var(--vc-mono);font-size:11px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--vc-ink-muted);margin-bottom:12px}@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\n<\/style>\n\n<div class=\"vc-calculator\">\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool #214<\/p>\n    <h1 class=\"vc-header-title\">Noise Level Addition Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Combine up to 8 noise sources using logarithmic dB addition. Enter each source level in dB or dBA.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">L = 10\u00b7log\u2081\u2080(\u03a310^(Li\/10))<\/span><span class=\"vc-badge\">Up to 8 Sources<\/span><span class=\"vc-badge\">dB \/ dBA<\/span><\/div>\n<\/header>\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s1\">Source 1 <span class=\"vc-label-hint\">(dB\/dBA)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s1\" step=\"any\" placeholder=\"e.g. 85\" value=\"85\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s2\">Source 2 <span class=\"vc-label-hint\">(dB\/dBA)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s2\" step=\"any\" placeholder=\"e.g. 82\" value=\"82\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s3\">Source 3 <span class=\"vc-label-hint\">(optional)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s3\" step=\"any\" placeholder=\"e.g. 78\" value=\"78\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s4\">Source 4 <span class=\"vc-label-hint\">(optional)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s4\" step=\"any\" placeholder=\"\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s5\">Source 5 <span class=\"vc-label-hint\">(optional)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s5\" step=\"any\" placeholder=\"\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s6\">Source 6 <span class=\"vc-label-hint\">(optional)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s6\" step=\"any\" placeholder=\"\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s7\">Source 7 <span class=\"vc-label-hint\">(optional)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s7\" step=\"any\" placeholder=\"\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-s8\">Source 8 <span class=\"vc-label-hint\">(optional)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-s8\" step=\"any\" placeholder=\"\"><\/div>\n        <\/div>\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-vals=\"80,80\">Two equal 80 dB<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-vals=\"85,82,78\">Machine shop 3 sources<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-vals=\"90,85,80,75\">Factory 4 machines<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Results<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button><\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Combined Noise Level<\/div><div class=\"vc-rcard-value\" id=\"vc-r-total\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Number of Sources<\/div><div class=\"vc-rcard-value\" id=\"vc-r-count\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Increase over Loudest<\/div><div class=\"vc-rcard-value\" id=\"vc-r-increase\">\u2014<\/div><\/div>\n        <\/div>\n        <div class=\"vc-viz\" id=\"vc-viz\"><div class=\"vc-viz-title\">Noise Sources Bar Chart<\/div><svg id=\"vc-viz-svg\" viewBox=\"0 0 600 250\"><\/svg><\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Theory &amp; Formulas<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>Logarithmic dB Addition<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n        <ul><li>Adding two equal sources increases level by <strong>3 dB<\/strong><\/li><li>If difference &gt;10 dB, the quieter source contributes &lt;0.4 dB<\/li><li>Adding 10 equal sources increases level by <strong>10 dB<\/strong><\/li><\/ul>\n        <div class=\"vc-example-box\"><div class=\"vc-example-title\">Example \u2014 85 + 82 + 78 dB<\/div>\n            <p>L = 10\u00d7log10(10^8.5 + 10^8.2 + 10^7.8) = 10\u00d7log10(3.16\u00d710\u2078 + 1.58\u00d710\u2078 + 0.63\u00d710\u2078)<\/p>\n            <p>= 10\u00d7log10(5.37\u00d710\u2078) = <strong>87.3 dB<\/strong><\/p>\n        <\/div>\n    <\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/noise-distance-attenuation\/\">Noise Distance Attenuation<\/a><a class=\"vc-related-link\" href=\"\/calculators\/sound-level-converter\/\">Sound Level Converter<\/a><\/div><\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\n<\/div>\n\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional vibration instruments.<\/div><a class=\"vc-promo-link\" 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