{"id":100101,"date":"2026-02-15T20:16:40","date_gmt":"2026-02-15T20:16:40","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100101"},"modified":"2026-07-12T06:29:45","modified_gmt":"2026-07-12T06:29:45","slug":"flow-rate-converter","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/uk\/calculators\/flow-rate-converter\/","title":{"rendered":"Exact Volumetric Flow Rate Converter"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Exact Volumetric Flow Rate Converter\",\"description\":\"Convert signed volumetric flow between cubic metres per second or hour, litres per second or minute, U.S. liquid gallons per minute and international cubic feet per minute using exact unit definitions.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/flow-rate-converter\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"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\":\"Which gallon does US gal\/min use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The U.S. liquid gallon, exactly 231 cubic inches. It is not the Imperial gallon.\"}},{\"@type\":\"Question\",\"name\":\"Does converting CFM change actual flow to standard or normal flow?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This page changes only the volume\/time unit. Actual, standard and normal gas flows require a separately specified reference state and gas correction.\"}}]}<\/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\":\"Exact volumetric flow converter\",\"item\":\"https:\/\/vibromera.eu\/calculators\/flow-rate-converter\/\"}]}<\/script>\r\n<link rel=\"preconnect\" 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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.vc-form-grid-flow{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.vc-result-note{margin:0;color:var(--vc-ink-secondary);font-size:13px}@media(max-width:600px){.vc-form-grid-flow{grid-template-columns:1fr}}\r\n<\/style>\r\n<div class=\"vc-calculator\" id=\"vc-flow-converter\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Exact unit definitions \u2014 signed volume flow<\/p><h1 class=\"vc-header-title\">Exact Volumetric Flow Rate Converter<\/h1><p class=\"vc-header-subtitle\">Convert the same volumetric flow quantity between SI,U.S. liquid-gallon and international-foot units without changing fluid state or reference conditions.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">m\u00b3\/s \u00b7 m\u00b3\/h<\/span><span class=\"vc-badge\">L\/s \u00b7 L\/min<\/span><span class=\"vc-badge\">US gal\/min \u00b7 ft\u00b3\/min<\/span><\/div><\/header>\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-form-grid-flow\">\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-val\">Signed volumetric flow value<\/label><input class=\"vc-input\" id=\"vc-val\" type=\"text\" inputmode=\"decimal\" placeholder=\"e.g. 10 or -2.5\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-from\">Input unit<\/label><select class=\"vc-select\" id=\"vc-from\"><option value=\"\">Select\u2026<\/option><option value=\"m3s\">m\u00b3\/s<\/option><option value=\"m3h\">m\u00b3\/h<\/option><option value=\"lps\">L\/s<\/option><option value=\"lmin\">L\/min<\/option><option value=\"usgpm\">US gal\/min<\/option><option value=\"cfm\">ft\u00b3\/min (CFM,international foot)<\/option><\/select><\/div>\r\n<\/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>Quantity boundary:<\/strong> this is only a volume\/time unit conversion. It does not convert mass flow,density-compensated flow,actual gas flow to standard\/normal flow,or a U.S. gallon to an Imperial gallon. A negative value is retained as an explicitly signed direction.<\/p><\/div><\/form>\r\n<div class=\"vc-results\" id=\"vc-results\" aria-live=\"polite\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Converted values<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\">\r\n<div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Cubic metres per second<\/div><div class=\"vc-rcard-value\" id=\"vc-r-m3s\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Cubic metres per hour<\/div><div class=\"vc-rcard-value\" id=\"vc-r-m3h\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Litres per second<\/div><div class=\"vc-rcard-value\" id=\"vc-r-lps\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Litres per minute<\/div><div class=\"vc-rcard-value\" id=\"vc-r-lmin\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">U.S. liquid gallons per minute<\/div><div class=\"vc-rcard-value\" id=\"vc-r-usgpm\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">International cubic feet per minute<\/div><div class=\"vc-rcard-value\" id=\"vc-r-cfm\">\u2014<\/div><\/div>\r\n<\/div><p class=\"vc-result-note\" id=\"vc-r-note\"><\/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\">Definitions and conversion basis<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\r\n<h3>Single SI base<\/h3><div class=\"vc-formula-box\">Q<sub>m\u00b3\/s<\/sub>=value\u00d7factor<sub>input<\/sub><br>value<sub>output<\/sub>=Q<sub>m\u00b3\/s<\/sub>\/factor<sub>output<\/sub><\/div><p>Exact factors to m\u00b3\/s are:m\u00b3\/s=1;m\u00b3\/h=1\/3600;L\/s=0.001;L\/min=1\/60000;US gal\/min=0.0000630901964;ft\u00b3\/min=0.0004719474432.<\/p>\r\n<h3>Traceable definitions<\/h3><p><a href=\"https:\/\/www.nist.gov\/pml\/special-publication-811\/nist-guide-si-appendix-b-conversion-factors\" target=\"_blank\" rel=\"noopener\">NIST SP811 AppendixB<\/a> identifies exact conversion factors and defines the international foot as exactly0.3048m. <a href=\"https:\/\/www.nist.gov\/system\/files\/documents\/2024\/01\/14\/NIST%20HB%2044%202024%20Appendix%20C%20General%20Tables%20of%20Units%20of%20Measurement.pdf\" target=\"_blank\" rel=\"noopener\">NIST Handbook44 AppendixC<\/a> defines the U.S. liquid gallon as exactly231in\u00b3. Together with1in=0.0254m exactly,this gives1US gal=0.003785411784m\u00b3 exactly. One litre is1dm\u00b3,so1L=0.001m\u00b3 exactly;1min=60s and1h=3600s.<\/p>\r\n<h3>State and density are unchanged<\/h3><p>For liquids and gases,the numerical conversion assumes the same volumetric-flow quantity at the same stated conditions. Mass flow requires density on a compatible basis. Standard\/normal gas flow requires the exact reference pressure,temperature,humidity\/compressibility convention and a gas-state calculation;none is inferred here.<\/p>\r\n<\/div><\/div><\/div><footer class=\"vc-footer\"><p>\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Exact unit conversion only;fluid state,density and reference conditions are unchanged. Scientific review:July2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';function $(id){return document.getElementById(id)}var factors={m3s:1,m3h:1\/3600,lps:0.001,lmin:1\/60000,usgpm:0.0000630901964,cfm:0.0004719474432};var outputs=[['vc-r-m3s','m3s','m\u00b3\/s'],['vc-r-m3h','m3h','m\u00b3\/h'],['vc-r-lps','lps','L\/s'],['vc-r-lmin','lmin','L\/min'],['vc-r-usgpm','usgpm','US gal\/min'],['vc-r-cfm','cfm','ft\u00b3\/min']];function num(raw){var s=String(raw).trim().replace(',','.');return \/^[+-]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:[eE][+-]?\\d+)?$\/.test(s)?Number(s):NaN}function fmt(x){if(Object.is(x,-0))x=0;return Number(x.toPrecision(12)).toString()}function clear(){outputs.forEach(function(row){$(row[0]).textContent='\u2014'});$('vc-r-note').textContent='';$('vc-results').classList.remove('vc-visible')}function calc(){var raw=$('vc-val').value.trim(),unit=$('vc-from').value,url=new URL(location);if(raw)url.searchParams.set('value',raw);else url.searchParams.delete('value');if(unit)url.searchParams.set('unit',unit);else url.searchParams.delete('unit');history.replaceState(null,'',url.toString());if(!raw||!unit){clear();$('vc-error').textContent=(raw||unit)?'Enter a value and select its unit.':'';return}var value=num(raw);if(!Number.isFinite(value)||Math.abs(value)>1e300||(value!==0&&Math.abs(value)<1e-300)){clear();$('vc-error').textContent='Value must be a strict,finite number from10\u207b\u00b3\u2070\u2070 to10\u00b3\u2070\u2070 in magnitude,or zero.';return}var base=value*factors[unit],values=outputs.map(function(row){return base\/factors[row[1]]});if(!Number.isFinite(base)||!values.every(Number.isFinite)){clear();$('vc-error').textContent='The converted result exceeds the finite numerical range.';return}$('vc-error').textContent='';outputs.forEach(function(row,i){$(row[0]).textContent=fmt(values[i])+' '+row[2]});$('vc-r-note').textContent='Input:'+fmt(value)+' '+outputs.filter(function(row){return row[1]===unit})[0][2]+' | Signed volumetric flow;same fluid state and reference conditions.';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calc);$('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(button){button.addEventListener('click',function(){var section=this.closest('.vc-section');section.classList.toggle('vc-open');this.setAttribute('aria-expanded',section.classList.contains('vc-open'))})});var query=new URLSearchParams(location.search);if(query.has('value'))$('vc-val').value=query.get('value');if(query.has('unit'))$('vc-from').value=query.get('unit');calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Convert signed volumetric flow between m\u00b3\/s, m\u00b3\/h, L\/s, L\/min, U.S. liquid gal\/min and international ft\u00b3\/min using exact unit definitions. Fluid state and reference conditions are unchanged.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100101","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/calculator\/100101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/calculator\/100101\/revisions"}],"predecessor-version":[{"id":102407,"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/calculator\/100101\/revisions\/102407"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/media?parent=100101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/categories?post=100101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/uk\/wp-json\/wp\/v2\/tags?post=100101"}],"curies":[{"name":"\u0412\u041f","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}