{"id":100054,"date":"2026-02-15T20:09:32","date_gmt":"2026-02-15T20:09:32","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100054"},"modified":"2026-07-11T22:58:49","modified_gmt":"2026-07-11T22:58:49","slug":"centrifuge-g-force","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/ka\/calculators\/centrifuge-g-force\/","title":{"rendered":"Centrifuge RCF \u2194 RPM | Exact Acceleration Ratio"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Centrifuge RCF and RPM Arithmetic\",\"description\":\"Convert rotational speed and a specified radial position into relative centrifugal acceleration, or invert the equation for speed, using standard acceleration g_n.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/centrifuge-g-force\/\",\"applicationCategory\":\"Scientific Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-12\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is RCF a force?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"RCF is conventionally named relative centrifugal force, but its numerical value is the dimensionless ratio of radial acceleration to standard acceleration g_n.\"}},{\"@type\":\"Question\",\"name\":\"Which centrifuge radius should be entered?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Use the radial position defined by the governing protocol or equipment documentation. A sample can span minimum, average and maximum radii, so maximum radius is not a universal choice.\"}},{\"@type\":\"Question\",\"name\":\"Is a calculated RPM safe to set?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not necessarily. Never exceed the rated limits or configuration rules for the centrifuge, rotor, buckets, adapters, tubes and load.\"}}]}<\/script>\r\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\":\"Centrifuge RCF and RPM\",\"item\":\"https:\/\/vibromera.eu\/calculators\/centrifuge-g-force\/\"}]}<\/script>\r\n<link rel=\"preconnect\" 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td{padding:8px}}\r\n.vc-faq-list{display:flex;flex-direction:column;gap:8px;margin-top:20px}.vc-faq-item{border:1px solid var(--vc-border-light);border-radius:6px;overflow:hidden}\r\n.vc-faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border:none;background:var(--vc-surface-alt);cursor:pointer;font-family:var(--vc-font);font-size:15px;font-weight:600;color:var(--vc-ink);text-align:left;transition:background 0.15s}.vc-faq-q:hover{background:#ede9e3}\r\n.vc-faq-chevron{width:16px;height:16px;color:var(--vc-ink-muted);flex-shrink:0;transition:transform 0.25s}.vc-faq-item.vc-open .vc-faq-chevron{transform:rotate(180deg)}\r\n.vc-faq-a{max-height:0;overflow:hidden;transition:max-height 0.35s}.vc-faq-item.vc-open .vc-faq-a{max-height:1200px}\r\n.vc-faq-a-inner{padding:14px 16px;border-top:1px solid var(--vc-border-light);font-size:14px;color:var(--vc-ink-secondary)}.vc-faq-a-inner p{margin:0 0 8px}.vc-faq-a-inner p:last-child{margin-bottom:0}.vc-faq-a-inner ul{margin:4px 0 8px 16px;padding:0}.vc-faq-a-inner li{margin-bottom:3px}\r\n.vc-related{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.vc-related-link{display:inline-block;padding:8px 16px;font-family:var(--vc-font);font-size:13px;font-weight:600;background:var(--vc-surface-alt);color:var(--vc-ink-secondary);border:1px solid var(--vc-border);border-radius:var(--vc-radius);text-decoration:none;transition:all 0.15s}.vc-related-link:hover{border-color:var(--vc-accent);color:var(--vc-accent);background:var(--vc-accent-light)}\r\n.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}\r\n.vc-promo-text{flex:1;font-size:14px;color:var(--vc-ink-secondary)}.vc-promo-text strong{color:var(--vc-ink)}\r\n.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 0.15s}.vc-promo-link:hover{background:var(--vc-accent-hover)}\r\n.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}\r\n@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}}\r\n<\/style>\r\n<div class=\"vc-calculator\" id=\"vc-rcf\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Acceleration-ratio arithmetic<\/p><h1 class=\"vc-header-title\">Centrifuge RCF \u2194 RPM Calculator<\/h1><p class=\"vc-header-subtitle\">Calculate relative centrifugal acceleration at a specified radial position, or invert the same equation for speed. Use the radius definition required by the protocol and verify all equipment limits.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">RCF = a\u1d63\/g\u2099<\/span><span class=\"vc-badge\">g\u2099 = 9.80665 m\/s\u00b2<\/span><span class=\"vc-badge\">No speed authorization<\/span><\/div><\/header>\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-form-grid\"><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-mode\">Calculation direction<\/label><select class=\"vc-select\" id=\"vc-mode\"><option value=\"rpm2rcf\">RPM \u2192 RCF<\/option><option value=\"rcf2rpm\">RCF \u2192 RPM<\/option><\/select><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-radius\">Specified radial position r <span class=\"vc-label-hint\">(mm from rotation axis)<\/span><\/label><input class=\"vc-input\" type=\"text\" id=\"vc-radius\" inputmode=\"decimal\"><\/div><div class=\"vc-field\" id=\"vc-speed-field\"><label class=\"vc-label\" for=\"vc-speed\">Rotational speed n <span class=\"vc-label-hint\">(rpm)<\/span><\/label><input class=\"vc-input\" type=\"text\" id=\"vc-speed\" inputmode=\"decimal\"><\/div><div class=\"vc-field\" id=\"vc-target-field\" style=\"display:none\"><label class=\"vc-label\" for=\"vc-target\">Target RCF <span class=\"vc-label-hint\">(\u00d7 g\u2099)<\/span><\/label><input class=\"vc-input\" type=\"text\" id=\"vc-target\" inputmode=\"decimal\"><\/div><\/div><p id=\"vc-error\" role=\"alert\" style=\"margin:.75rem 0 0;color:#b42318\"><\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Radius is protocol-specific:<\/strong> enter the distance to the exact sample position specified by the method or manufacturer\u2014such as tube bottom, midpoint, r<sub>min<\/sub>, r<sub>avg<\/sub> or r<sub>max<\/sub>. The acceleration varies along a tube.<\/p><\/div><\/form>\r\n<div class=\"vc-results\" id=\"vc-results\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Calculated operating quantity<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\"><div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\" id=\"vc-primary-label\">RCF at specified radius<\/div><div class=\"vc-rcard-value\" id=\"vc-r-primary\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Rotational speed<\/div><div class=\"vc-rcard-value\" id=\"vc-r-rpm\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Radial acceleration<\/div><div class=\"vc-rcard-value\" id=\"vc-r-accel\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Angular speed<\/div><div class=\"vc-rcard-value\" id=\"vc-r-omega\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Tangential speed at specified radius<\/div><div class=\"vc-rcard-value\" id=\"vc-r-tangent\">\u2014<\/div><\/div><\/div><p style=\"margin:0;color:var(--vc-ink-secondary)\">A calculated speed is mathematical output only. It is not permission to operate any centrifuge or rotor at that speed.<\/p><\/div><\/div>\r\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\">Equation, radius and safety boundary<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><h3>Relative centrifugal acceleration<\/h3><div class=\"vc-formula-box\">\u03c9 = 2\u03c0n\/60; &nbsp; a\u1d63 = \u03c9\u00b2r; &nbsp; RCF = a\u1d63\/g\u2099; &nbsp; g\u2099 = 9.80665 m\/s\u00b2<\/div><p>With r in millimetres and n in revolutions per minute, RCF = 1.118243958163237 \u00d7 10\u207b\u2076 \u00b7 r \u00b7 n\u00b2. The reverse is n = \u221a[RCF\/(K\u00b7r)]. RCF is a dimensionless acceleration ratio conventionally reported as \u201c\u00d7 g\u201d; it is not itself a force unless multiplied by mass and treated in a defined reference-frame model.<\/p><p>The <a href=\"https:\/\/jcgm.bipm.org\/vim\/en\/2.12.html\" target=\"_blank\" rel=\"noopener\">BIPM\/JCGM International Vocabulary of Metrology<\/a> gives the conventional standard acceleration g\u2099 = 9.80665 m\/s\u00b2. A published <a href=\"https:\/\/www.niaid.nih.gov\/sites\/default\/files\/PBMC_SOP.pdf\" target=\"_blank\" rel=\"noopener\">NIAID PBMC procedure<\/a> uses the familiar rounded 1.118 form and explicitly defines its centrifugal radius to the tube bottom for that procedure. Other methods can define another point, so copy the governing method&#8217;s radius definition rather than assuming r<sub>max<\/sub>.<\/p><h3>Equipment and method limits<\/h3><p><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/24959\" target=\"_blank\" rel=\"noopener\">IEC 61010-2-020:2016<\/a> is the current particular safety standard for electrically powered laboratory centrifuges and is read with IEC 61010-1:2010. This webpage is not a conformance assessment and does not determine a safe rotor speed.<\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Before operation:<\/strong> follow the centrifuge and protocol instructions; verify rated speed\/RCF for the exact rotor, buckets, adapters, tubes and load; check compatibility, inspection\/service status, balancing, seating, fill limits, temperature, braking and lid\/containment requirements. If calculated RPM exceeds any limit, do not use it.<\/p><\/div><h3>Checked example<\/h3><div class=\"vc-example-box\"><p style=\"margin:0\">At r = 100 mm and n = 5000 rpm: \u03c9 = 523.598776 rad\/s, a\u1d63 = 27 415.567781 m\/s\u00b2 and RCF = 2795.609895 \u00d7 g\u2099.<\/p><\/div><\/div><\/div><\/div>\r\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><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div><\/div><footer class=\"vc-footer\"><p>\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Acceleration-ratio arithmetic only; protocol and equipment documentation govern. Scientific review: July 2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';var GN=9.80665,K=(2*Math.PI\/60)*(2*Math.PI\/60)\/(1000*GN);function $(i){return document.getElementById(i)}function positive(raw,zero){var s=String(raw).trim().replace(\/\\s+\/g,'');if(!\/^[+]?(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)$\/.test(s))return NaN;var n=Number(s.replace(',','.'));return Number.isFinite(n)&&(zero?n>=0:n>0)?n:NaN}function f(n){if(Math.abs(n)<5e-13)n=0;if(Math.abs(n)>=1e12)return n.toExponential(9);return n.toFixed(9).replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}function sync(){var rev=$('vc-mode').value==='rcf2rpm';$('vc-speed-field').style.display=rev?'none':'';$('vc-target-field').style.display=rev?'':'none'}function calc(){sync();var mode=$('vc-mode').value,r=positive($('vc-radius').value,false),raw=mode==='rpm2rcf'?$('vc-speed').value:$('vc-target').value,v=positive(raw,true);if(!Number.isFinite(r)||!Number.isFinite(v)){$('vc-error').textContent=$('vc-radius').value.trim()||raw.trim()?'Radius must be positive; RPM and RCF must be finite and non-negative.':'';$('vc-results').classList.remove('vc-visible');return}$('vc-error').textContent='';var rpm,rcf;if(mode==='rpm2rcf'){rpm=v;rcf=K*r*rpm*rpm}else{rcf=v;rpm=Math.sqrt(rcf\/(K*r))}var w=2*Math.PI*rpm\/60,a=rcf*GN,t=w*r\/1000;if(![rpm,rcf,w,a,t].every(Number.isFinite)){$('vc-error').textContent='The values exceed the finite calculation range.';$('vc-results').classList.remove('vc-visible');return}$('vc-primary-label').textContent=mode==='rpm2rcf'?'RCF at specified radius':'Required mathematical speed';$('vc-r-primary').innerHTML=(mode==='rpm2rcf'?f(rcf)+' <span class=\"vc-rcard-unit\">\u00d7 g\u2099<\/span>':f(rpm)+' <span class=\"vc-rcard-unit\">rpm<\/span>');$('vc-r-rpm').innerHTML=f(rpm)+' <span class=\"vc-rcard-unit\">rpm<\/span>';$('vc-r-accel').innerHTML=f(a)+' <span class=\"vc-rcard-unit\">m\/s\u00b2<\/span>';$('vc-r-omega').innerHTML=f(w)+' <span class=\"vc-rcard-unit\">rad\/s<\/span>';$('vc-r-tangent').innerHTML=f(t)+' <span class=\"vc-rcard-unit\">m\/s<\/span>';$('vc-results').classList.add('vc-visible');var u=new URL(location);u.searchParams.set('calculation',mode);u.searchParams.set('radius_mm',r);if(mode==='rpm2rcf'){u.searchParams.set('rotational_speed_rpm',rpm);u.searchParams.delete('target_rcf')}else{u.searchParams.set('target_rcf',rcf);u.searchParams.delete('rotational_speed_rpm')}history.replaceState(null,'',u.toString())}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);$('vc-copy-btn').addEventListener('click',function(){if(navigator.clipboard)navigator.clipboard.writeText($('vc-results').innerText)});document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});var q=[['Is RCF a force?','Despite its conventional name, the displayed number is the ratio of radial acceleration to standard acceleration g\u2099.'],['Which radius should I use?','Use the position defined by the governing protocol or equipment documentation. Do not assume maximum, average or minimum radius.'],['May I set the calculated RPM directly?','Only if it is permitted for the exact centrifuge, rotor, accessories, tubes, load and procedure. This page does not approve a speed.']];var l=$('vc-faq-list');q.forEach(function(v){l.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\">'+v[0]+'<\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\"><p>'+v[1]+'<\/p><\/div><\/div><\/div>'});l.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});var z=new URLSearchParams(location.search);if(['rpm2rcf','rcf2rpm'].indexOf(z.get('calculation'))>=0)$('vc-mode').value=z.get('calculation');if(z.has('radius_mm'))$('vc-radius').value=z.get('radius_mm');if(z.has('rotational_speed_rpm'))$('vc-speed').value=z.get('rotational_speed_rpm');if(z.has('target_rcf'))$('vc-target').value=z.get('target_rcf');calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Convert centrifuge speed and a specified radial position into RCF, or invert for mathematical RPM, using exact standard acceleration; equipment limits still govern.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100054","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/calculator\/100054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":4,"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/calculator\/100054\/revisions"}],"predecessor-version":[{"id":102344,"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/calculator\/100054\/revisions\/102344"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/media?parent=100054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/categories?post=100054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ka\/wp-json\/wp\/v2\/tags?post=100054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}