{"id":61885,"date":"2021-05-14T10:56:36","date_gmt":"2021-05-14T08:56:36","guid":{"rendered":"https:\/\/wpcalc.com\/?p=61885"},"modified":"2026-09-30T18:12:09","modified_gmt":"2026-09-30T15:12:09","slug":"concrete-footing-slab-pours","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/engineering\/concrete-footing-slab-pours\/","title":{"rendered":"Concrete Pour Volume Calculator (Footing\/Slab)"},"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\">Calculate Concrete Volume for Slab or Footing Pours<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"61885\" data-favorite-title=\"Concrete Footing\/Slab Pours\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-footing-slab-pours\/\" data-favorite-excerpt=\"Calculate the concrete volume needed for a rectangular footing or slab pour. Enter the footing length in feet plus the width and depth in inches, and get the result in cubic yards.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-engineering\">\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\/engineering\/concrete-footing-slab-pours\/\" method=\"POST\" class=\"calculator\" id=\"calculator-61885\" data-post=\"61885\"><fieldset class=\"fieldset-input is-3\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Diameter<\/label><div class=\"term\">D<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"diameter\" id=\"field-1\" aria-describedby=\"calc-unit-1\" step=\"0.01\" value=\"10\"\/><div class=\"unit\" id=\"calc-unit-1\">ft<\/div><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Width<\/label><div class=\"term\">W<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"width\" id=\"field-2\" aria-describedby=\"calc-unit-2\" step=\"0.01\" value=\"24\"\/><div class=\"unit\" id=\"calc-unit-2\">in<\/div><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Depth<\/label><div class=\"term\">H<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"depth\" id=\"field-3\" aria-describedby=\"calc-unit-3\" step=\"0.01\" value=\"18\"\/><div class=\"unit\" id=\"calc-unit-3\">in<\/div><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"61885\">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\" id=\"output-1\"><span class=\"field-title\"><span>Footing pours<\/span><span class=\"result-term\">Q<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"yd\u00b3\"><\/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=\"61885\" 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\">0<\/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\">0<\/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\">0<\/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\">0<\/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\">0<\/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>Concrete Pour Volume 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 = \\frac{D \\cdot \\left( \\frac{W}{12} \\right) \\cdot \\left( \\frac{H}{12} \\right) }{27} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(Q\\) \u2014 concrete volume required (yd\u00b3)<\/li>\n<li>\\(D\\) \u2014 length of the footing or slab run (ft), entered in the <em>Diameter<\/em> field<\/li>\n<li>\\(W\\) \u2014 width of the footing (in)<\/li>\n<li>\\(H\\) \u2014 depth or thickness of the pour (in)<\/li>\n<li>\\(12\\) \u2014 converts inches to feet<\/li>\n<li>\\(27\\) \u2014 converts cubic feet to cubic yards (1 yd\u00b3 = 27 ft\u00b3)<\/li>\n<\/ul>\n<p>This formula computes the volume of a rectangular footing or slab strip: length \u00d7 width \u00d7 depth. The width and depth are converted from inches to feet before multiplying, and the total is divided by 27 to express the result in cubic yards, the standard unit for ordering ready-mix concrete.<\/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>Concrete Pour Volume \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a deck footing trench runs 10 feet, with a width of 24 inches and a depth of 18 inches.<\/p>\n<p>\\[ W = \\frac{24}{12} = 2 \\text{ ft}, \\quad H = \\frac{18}{12} = 1.5 \\text{ ft} \\]<\/p>\n<p>\\[ Q = \\frac{10 \\cdot 2 \\cdot 1.5}{27} = \\frac{30}{27} \\approx 1.11 \\text{ yd}^3 \\]<\/p>\n<p><strong>Result:<\/strong> about 1.11 cubic yards of concrete are needed for this pour. With a 10% waste allowance, order roughly 1.25 yd\u00b3.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Enter the total length of the footing or slab run in feet in the <strong>Diameter<\/strong> field (e.g. 10).<\/li>\n<li>Enter the <strong>Width<\/strong> of the footing in inches (e.g. 24).<\/li>\n<li>Enter the <strong>Depth<\/strong> or thickness of the pour in inches (e.g. 18).<\/li>\n<li>Read the result under <strong>Footing pours<\/strong>, shown in cubic yards \u2014 the unit used by ready-mix suppliers.<\/li>\n<\/ol>\n<h2>What the calculator tells you<\/h2>\n<p>A footing is the concrete strip or pad that sits below a wall, deck post, or column and spreads the load onto the soil. A slab is the flat concrete surface used for floors, patios, and driveways. Both are poured as simple rectangular volumes, so the amount of concrete they need is the enclosed space: length times width times depth.<\/p>\n<p>Ready-mix concrete in most markets is sold by the cubic yard, and suppliers typically have a minimum order (often around 1 yd\u00b3) plus delivery charges. Knowing your volume before you call lets you compare quotes, schedule a single delivery, and avoid paying for a short load fee or running short mid-pour \u2014 a cold joint between two batches is one of the weakest points a pour can have.<\/p>\n<p>For the default values (10 ft \u00d7 24 in \u00d7 18 in), the result is 1.11 yd\u00b3. If you are mixing by hand or with a portable mixer, that is about 30 cubic feet of mixed concrete \u2014 a substantial job, which is why most footings of this size are ordered as ready-mix. For estimating bagged mix, one 80 lb bag yields roughly 0.6 ft\u00b3, so this pour would take about 50 bags.<\/p>\n<p>If your footings are round pads or tubes rather than rectangular strips, the math changes: a circular footing uses \\( \\pi r^2 \\) for the cross-section. The <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-column-fill\/\">Concrete Column Fill<\/a> calculator handles round shapes, and the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-footer-volume\/\">Concrete Footing Volume<\/a> calculator covers other footing configurations.<\/p>\n<h2>Assumptions, limitations and practical tips<\/h2>\n<ul>\n<li><strong>The pour is treated as a perfect rectangular prism.<\/strong> It assumes uniform width and depth along the whole run. Trenches dug slightly wide, uneven bottoms, or sloped sites will all take more concrete than calculated.<\/li>\n<li><strong>Add a waste allowance of 5\u201310%.<\/strong> Spillage, over-excavation, and residue left in the truck or mixer all consume material. On the 1.11 yd\u00b3 example, ordering 1.25 yd\u00b3 is a safe margin.<\/li>\n<li><strong>Units are fixed by the field labels.<\/strong> The length (Diameter field) must be in feet, while width and depth must be in inches. Mixing the units up is the most common source of error \u2014 a 24 entered as feet instead of inches would overestimate the pour by a factor of 12.<\/li>\n<li><strong>This is volume only, not strength.<\/strong> The calculator does not check whether the footing size meets your local building code or soil conditions. For load-bearing footings, confirm dimensions with your engineer or code official.<\/li>\n<li><strong>Each pour is calculated separately.<\/strong> For multiple footings of the same size, multiply the result by the number of pours, or run the calculator once with the combined total length.<\/li>\n<\/ul>\n<p>For other project shapes, see the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-yardage\/\">Concrete Yardage<\/a> calculator for general slabs and pads, or the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-slab-pour-volume\/\">Concrete Slab Pour Volume<\/a> calculator for slab-specific pours.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculate the concrete volume needed for a rectangular footing or slab pour. Enter the footing length in feet plus the width and depth in inches, and get the result in cubic yards.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[96],"class_list":["post-61885","post","type-post","status-publish","format-standard","hentry","category-engineering","tag-concrete"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/61885","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=61885"}],"version-history":[{"count":2,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/61885\/revisions"}],"predecessor-version":[{"id":65959,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/61885\/revisions\/65959"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=61885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=61885"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=61885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}