{"id":59966,"date":"2016-12-29T11:27:52","date_gmt":"2016-12-29T09:27:52","guid":{"rendered":"https:\/\/wpcalc.com\/?p=59966"},"modified":"2026-09-30T18:13:49","modified_gmt":"2026-09-30T15:13:49","slug":"concrete-slab-pour-volume","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/engineering\/concrete-slab-pour-volume\/","title":{"rendered":"Concrete Slab Volume Calculator"},"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 Pour<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"59966\" data-favorite-title=\"Concrete Slab Pour Volume\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-slab-pour-volume\/\" data-favorite-excerpt=\"Estimate how much concrete you need for a rectangular slab. Enter the width and length in feet and the thickness in inches to get the pour volume 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-slab-pour-volume\/\" method=\"POST\" class=\"calculator\" id=\"calculator-59966\" data-post=\"59966\"><fieldset class=\"fieldset-input\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">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-1\" aria-describedby=\"calc-unit-1\" step=\"0.1\" value=\"10\"\/><div class=\"unit\" id=\"calc-unit-1\">ft<\/div><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Length<\/label><div class=\"term\">l<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"length\" id=\"field-2\" aria-describedby=\"calc-unit-2\" step=\"0.1\" value=\"20\"\/><div class=\"unit\" id=\"calc-unit-2\">ft<\/div><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Thickness<\/label><div class=\"term\">t<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"thickness\" id=\"field-3\" aria-describedby=\"calc-unit-3\" step=\"0.1\" value=\"6\"\/><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=\"59966\">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>Concrete Volume<\/span><span class=\"result-term\">V<\/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=\"59966\" 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 Slab 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\\[ V = \\frac{w \\cdot l \\cdot \\left(\\dfrac{t}{12}\\right)}{27} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(w\\) \u2014 width of the slab (ft)<\/li>\n<li>\\(l\\) \u2014 length of the slab (ft)<\/li>\n<li>\\(t\\) \u2014 thickness of the slab (in)<\/li>\n<li>\\(V\\) \u2014 required concrete volume (yd\u00b3)<\/li>\n<\/ul>\n<p>The width and length are multiplied to get the slab's surface area, the thickness is converted from inches to feet by dividing by 12, and the resulting volume in cubic feet is divided by 27 (the number of cubic feet in one cubic yard) because ready-mix concrete is typically ordered by the cubic yard.<\/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 Slab Pour Volume \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a patio slab is 10 ft wide, 20 ft long, and 6 inches thick.<\/p>\n<p>\\[ V = \\frac{10 \\times 20 \\times (6\/12)}{27} = \\frac{100}{27} \\approx 3.7037 \\]\n<\/p>\n<p><strong>Result:<\/strong> about 3.70 yd\u00b3 of concrete is needed for the pour.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Enter the <strong>Width<\/strong> of the slab in feet (default 10 ft).<\/li>\n<li>Enter the <strong>Length<\/strong> of the slab in feet (default 20 ft).<\/li>\n<li>Enter the <strong>Thickness<\/strong> of the slab in inches (default 6 in, a common slab thickness).<\/li>\n<li>Read the <strong>Concrete Volume<\/strong> in cubic yards \u2014 the amount you should order.<\/li>\n<\/ol>\n<h2>What Is a Concrete Slab Pour Volume?<\/h2>\n<p>A concrete slab is a flat, horizontal layer of concrete used for patios, driveways, shed bases, garage floors, and building foundations. Before pouring, you need to know exactly how much concrete the job requires, because ready-mix trucks deliver concrete by the cubic yard and a shortage mid-pour can ruin the finish and weaken the slab.<\/p>\n<p>The math is simple volume geometry: the slab is a rectangular box, so its volume equals the surface area multiplied by the thickness. The only catch is unit conversion \u2014 width and length are usually measured in feet, thickness in inches, and concrete is sold in cubic yards. This calculator handles all three units and returns the answer directly in cubic yards.<\/p>\n<p>Interpreting the result: the figure is the net volume of the slab itself. In practice, most contractors add a 5\u201310% margin for spillage, over-excavation, and uneven subgrade, so a result of 3.70 yd\u00b3 usually means ordering 4 yd\u00b3. If your result falls between whole yards, always round up \u2014 it is cheaper than having a truck come back for a small top-up, and a cold joint between two pours weakens the slab.<\/p>\n<h2>Assumptions and Tips<\/h2>\n<ul>\n<li><strong>Rectangular shape only:<\/strong> the calculator assumes a flat, rectangular slab of uniform thickness. For L-shaped slabs, split the area into rectangles, calculate each one separately, and add the results.<\/li>\n<li><strong>Thickness matters a lot:<\/strong> because thickness is multiplied across the whole surface, a 5-inch slab needs about 17% less concrete than a 6-inch slab over the same area. Measure the actual planned thickness, not a nominal one.<\/li>\n<li><strong>Add a waste margin:<\/strong> order 5\u201310% more than the calculated volume to cover uneven ground, spillage, and slight over-depth of the excavation.<\/li>\n<li><strong>Common thicknesses:<\/strong> patios and walkways typically use 4 in, driveways 5\u20136 in, and slabs that will carry vehicle loads or heavy equipment often need 6 in or more with reinforcement.<\/li>\n<li><strong>Volume, not weight:<\/strong> the result is a volume estimate. To find the amounts of cement, sand, and gravel for a mix, see the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-ingredients\/\">Concrete Ingredients<\/a> and <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-mix-ratio\/\">Concrete Mix Ratio<\/a> calculators.<\/li>\n<\/ul>\n<h2>Related Calculators<\/h2>\n<p>For jobs beyond a simple flat slab, the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-yardage\/\">Concrete Yardage<\/a> calculator covers general pour shapes, the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-footing-slab-pours\/\">Concrete Footing\/Slab Pours<\/a> calculator handles combined footing and slab work, and the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-wall\/\">Concrete Wall<\/a> calculator estimates vertical pours. If you are checking whether a slab can carry a load, try the <a href=\"https:\/\/wpcalc.com\/en\/engineering\/concrete-slab-maximum-wall-load\/\">Concrete Slab Maximum Wall Load<\/a> calculator.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Estimate how much concrete you need for a rectangular slab. Enter the width and length in feet and the thickness in inches to get the pour volume 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-59966","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\/59966","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=59966"}],"version-history":[{"count":2,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/59966\/revisions"}],"predecessor-version":[{"id":65961,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/59966\/revisions\/65961"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=59966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=59966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=59966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}