{"id":55890,"date":"2015-10-24T15:55:03","date_gmt":"2015-10-24T13:55:03","guid":{"rendered":"http:\/\/wpcalc.com\/?p=55890"},"modified":"2026-09-28T09:20:22","modified_gmt":"2026-09-28T06:20:22","slug":"feet-per-minute-to-cubic-feet-per-minute","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/feet-per-minute-to-cubic-feet-per-minute\/","title":{"rendered":"Feet Per Minute to Cubic Feet Per Minute Converter"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Convert FPM to CFM<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"55890\" data-favorite-title=\"Feet Per Minute to CFM\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/feet-per-minute-to-cubic-feet-per-minute\/\" data-favorite-excerpt=\"Convert air velocity in feet per minute to airflow in cubic feet per minute. Enter the velocity and cross-sectional area, then select the area unit.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-units\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/converters\/feet-per-minute-to-cubic-feet-per-minute\/\" method=\"POST\" class=\"calculator\" id=\"calculator-55890\" data-post=\"55890\"><fieldset class=\"fieldset-input\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">Velocity<\/label><input type=\"text\" name=\"velocity\" id=\"field-1\" aria-describedby=\"calc-unit-1 calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"300\"\/><div class=\"unit\" id=\"calc-unit-1\">ft\/min<\/div><small id=\"calc-info-1\">Enter the air velocity in feet per minute (FPM)<\/small><\/div><div class=\"field\" id=\"input-2\"><label for=\"field-2\">Area<\/label><div class=\"field-group\"><input type=\"text\" name=\"area\" id=\"field-2\" aria-describedby=\"calc-info-2\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-3\" name=\"unit\" aria-label=\"Unit\"><option value=\"ft2\">ft\u00b2<\/option><option value=\"in2\">in\u00b2<\/option><option value=\"m2\">m\u00b2<\/option><option value=\"cm2\">cm\u00b2<\/option><option value=\"mm2\">mm\u00b2<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-2\">Enter the cross-sectional area<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"55890\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Your Results<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Cubic Feet per Minute (CFM)<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"55890\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">14<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">3<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">7<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">2<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">16<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Feet Per Minute to CFM Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[Q=v\\times A_{\\mathrm{ft}^2}\\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(Q\\) \u2014 volumetric airflow in cubic feet per minute (CFM)<\/li>\n<li>\\(v\\) \u2014 air velocity in feet per minute (ft\/min)<\/li>\n<li>\\(A_{\\mathrm{ft}^2}\\) \u2014 cross-sectional area in square feet (ft\u00b2)<\/li>\n<\/ul>\n<p>Airflow equals the distance air travels per minute multiplied by the area it passes through. If you select another area unit, the calculator converts the area to square feet before multiplying.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Feet Per Minute to CFM \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> air moves at 300 ft\/min through an opening with an area of 1 ft\u00b2, matching the calculator\u2019s default inputs.<\/p>\n<p>\\[Q=300\\ \\mathrm{ft\/min}\\times1\\ \\mathrm{ft}^2=300\\ \\mathrm{ft}^3\/\\mathrm{min}\\]<\/p>\n<p><strong>Result:<\/strong> the airflow is 300 ft\u00b3\/min, or 300 CFM.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Enter the measured or specified air speed in <strong>Velocity<\/strong>. The field uses feet per minute (ft\/min).<\/li>\n<li>Enter the area perpendicular to the airflow in <strong>Area<\/strong>. For a rectangular duct, multiply its inside width by its inside height; for a round duct, use the area of its inside opening.<\/li>\n<li>Choose the matching <strong>Unit<\/strong> for the area: ft\u00b2, in\u00b2, m\u00b2, cm\u00b2, or mm\u00b2. The selected unit applies to the number you entered in <strong>Area<\/strong>.<\/li>\n<li>Read <strong>Cubic Feet per Minute (CFM)<\/strong>. The displayed result is rounded to two decimal places.<\/li>\n<\/ol>\n<h2>What feet per minute and CFM tell you<\/h2>\n<p>Feet per minute (FPM) measures air velocity: how far the air travels in one minute. Cubic feet per minute (CFM) measures volumetric flow: how much space the moving air occupies as it passes through an opening each minute. Velocity alone cannot determine CFM because the same air speed can move different volumes through different-sized openings.<\/p>\n<p>For example, at 300 ft\/min, a 1 ft\u00b2 opening carries 300 CFM, while a 2 ft\u00b2 opening carries 600 CFM. At a fixed area, doubling the velocity also doubles the calculated flow. This relationship helps when interpreting duct measurements, checking ventilation airflow, or comparing velocities at openings of different sizes.<\/p>\n<p>The area must be the cross section through which the measured air is flowing, not the floor area of the room being served. A duct\u2019s inside dimensions may differ from its nominal dimensions. If your measurements are metric, you can use the corresponding area unit directly; for a linear dimension that needs converting, the <a href=\"https:\/\/wpcalc.com\/en\/converters\/meters-to-feet\/\">meters to feet converter<\/a> may help. Convert each length before calculating an area, or calculate the area in metric units and select the matching unit here.<\/p>\n<h2>Area conversions used by the calculator<\/h2>\n<p>The formula requires square feet. The calculator applies the following conversions to the entered <strong>Area<\/strong> before multiplying by <strong>Velocity<\/strong>:<\/p>\n<table>\n<thead>\n<tr>\n<th>Selected unit<\/th>\n<th>Area in square feet<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ft\u00b2<\/td>\n<td>Entered area<\/td>\n<\/tr>\n<tr>\n<td>in\u00b2<\/td>\n<td>Entered area \u00f7 144<\/td>\n<\/tr>\n<tr>\n<td>m\u00b2<\/td>\n<td>Entered area \u00d7 10.7639<\/td>\n<\/tr>\n<tr>\n<td>cm\u00b2<\/td>\n<td>Entered area \u00f7 929.03<\/td>\n<\/tr>\n<tr>\n<td>mm\u00b2<\/td>\n<td>Entered area \u00f7 92,903<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For instance, 72 in\u00b2 is 0.5 ft\u00b2. At 300 ft\/min, the calculated flow is \\(300\\times0.5=150\\) CFM. If you are working with other area units, convert them to one of the five supported choices before entering the value. The <a href=\"https:\/\/wpcalc.com\/en\/converters\/land-area\/\">land area unit converter<\/a> can help with an area expressed in another unit, although duct and vent openings are usually much smaller than land areas.<\/p>\n<h2>Assumptions and practical limits<\/h2>\n<p>This calculation treats the entered velocity as representative of the entire entered area. In a real duct, air velocity often varies across the cross section and near the walls. A single reading at the center may not equal the average velocity. For a more reliable airflow estimate, use an appropriate measurement method to determine average velocity across the opening.<\/p>\n<p>For a grille, screen, or other partly blocked opening, distinguish its overall face area from its effective open area. Use the area that corresponds to where and how the velocity was measured; mixing a velocity measured through the openings with the grille\u2019s full face area can overstate airflow. An air-handling system\u2019s actual flow can also change with filters, dampers, and pressure losses, so this result is not a prediction of fan performance.<\/p>\n<p>Both inputs must be zero or greater. Entering zero for either velocity or area produces zero CFM. The calculator reports volumetric airflow at the conditions of the measurement; it does not calculate air mass flow or adjust for changes in air density, temperature, or pressure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convert air velocity in feet per minute to airflow in cubic feet per minute. Enter the velocity and cross-sectional area, then select the area unit.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[13],"class_list":["post-55890","post","type-post","status-publish","format-standard","hentry","category-converters","tag-basic-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55890","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/70"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=55890"}],"version-history":[{"count":2,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55890\/revisions"}],"predecessor-version":[{"id":65271,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55890\/revisions\/65271"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=55890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=55890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=55890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}