{"id":6817,"date":"2026-08-07T09:00:00","date_gmt":"2026-08-07T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=6817"},"modified":"2026-08-07T17:40:02","modified_gmt":"2026-08-07T17:40:02","slug":"concrete-cubic-yard-calculators","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/concrete-cubic-yard-calculators\/","title":{"rendered":"Concrete Cubic Yard Calculator for Contractors (2026)"},"content":{"rendered":"<p><script>\ndocument.addEventListener('DOMContentLoaded', function() {\n  var sels = ['.entry-header','.page-header','article > h1:first-child','.entry-footer'];\n  sels.forEach(function(s){document.querySelectorAll(s).forEach(function(el){el.style.display='none';});});\n  var el = document.querySelector('.sw-a');\n  while (el && el !== document.body) {\n    el.style.maxWidth='100%'; el.style.width='100%'; el.style.padding='0'; el.style.margin='0';\n    el.style.float='none'; el.style.flex='0 0 100%';\n    el = el.parentElement;\n  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56px;}.sw__steps>li::before{left:0;width:42px;height:42px;font-size:17px;}.sw__table{font-size:13.5px;}.sw__table th,.sw__table td{padding:10px 14px;}.sw__promo{padding:32px 22px;}.sw__faq{padding:44px 0;}.sw__faq h2{font-size:26px;}.sw__final{padding:64px 0;}.sw__final h2{font-size:30px;}.sw__btn--lg{width:100%;text-align:center;}}<\/style>\n<p><script>\n(function(){\n  try{\n    var b=document.body;\n    if(b && b.classList){b.classList.add('single-post');}\n  }catch(e){}\n})();\n<\/script><\/p>\n<article class=\"sw\">\n<header class=\"sw__hero\">\n<div class=\"sw__inner\">\n<nav class=\"sw__crumb\">Blog &nbsp;&rsaquo;&nbsp; Concrete &nbsp;&rsaquo;&nbsp; Concrete Cubic Yard Calculator<\/nav>\n<p><span class=\"sw__eyebrow\">Concrete &middot; Estimating Guide<\/span><\/p>\n<h1>Concrete Cubic Yard Calculator for Contractors<\/h1>\n<p class=\"sw__dek\">The field formula every contractor needs to size a concrete pour: length times width times thickness divided by 27, with a conversion table, a waste factor, and worked examples.<\/p>\n<p class=\"sw__dek-cta\">In a hurry? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Price a job from a photo<\/a> in about six seconds.<\/p>\n<div class=\"sw__rating\"><span class=\"sw__stars\">&#9733;&#9733;&#9733;&#9733;&#9733;<\/span> <b>4.8<\/b> <span class=\"sw__rating-sub\">on the App Store<\/span><\/div>\n<div class=\"sw__meta\">\n<span>SimplyWise<\/span><br \/>\n<i><\/i><br \/>\n<span>Updated August 7, 2026<\/span><br \/>\n<i><\/i><br \/>\n<span>10 min read<\/span>\n<\/div>\n<figure class=\"sw__fig\">\n<img decoding=\"async\" alt=\"Ready mix concrete mixer trucks staged on an active construction site\" loading=\"eager\" src=\"https:\/\/images.unsplash.com\/photo-1527410651988-c2f385ccd3f7?w=1400&amp;h=700&amp;fit=crop&amp;q=80&amp;auto=format\"\/><br \/>\n<\/figure>\n<\/div>\n<\/header>\n<div class=\"sw__body\">\n<div class=\"sw__inner\">\n<aside class=\"sw__tldr\">\n<div class=\"sw__tldr-label\">Concrete cubic yard calculator, at a glance<\/div>\n<ol>\n<li>Measure length, width, and thickness of the pour. Convert every dimension to feet.<\/li>\n<li>Multiply length feet times width feet times thickness feet to get cubic feet.<\/li>\n<li>Divide the cubic feet result by 27 to convert to cubic yards.<\/li>\n<li>Add 7 to 10 percent waste for spillage, subgrade variation, and over-excavation.<\/li>\n<li>Round up to the nearest quarter yard before you call the plant.<\/li>\n<li>Give the plant the mix design, the slump, and the delivery window with the volume.<\/li>\n<\/ol>\n<div class=\"sw__tldr-cta\"><span>Pouring this week?<\/span><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><\/div>\n<\/aside>\n<h2>The concrete cubic yard calculator formula<\/h2>\n<p>A concrete cubic yard calculator runs on one formula. Length in feet times width in feet times thickness in feet, divided by 27. That single calculation turns a slab, driveway, footing, or sidewalk into the cubic yards of ready-mix you order. The number 27 is the count of cubic feet in one cubic yard. Get the thickness conversion right, add a waste factor, and round up. You will rarely run short on a pour.<\/p>\n<p>Concrete is sold by the cubic yard at the plant, and the load is not returnable once it leaves the yard. The <a href=\"https:\/\/www.nrmca.org\/about\/\" rel=\"noopener\" target=\"_blank\">National Ready Mixed Concrete Association<\/a> notes that the overwhelming majority of ready mixed concrete reaches the site in truck-mounted rotating drum mixers. It also puts the typical truck mixer at a 9 to 11 cubic yard unit. Most contractors still size the pour with a tape and mental math on the tailgate. That is where short orders and surprise short-load fees start. <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a> turns a site photo into an itemized estimate in about 6 seconds instead.<\/p>\n<h3>Where contractors trip<\/h3>\n<p>The formula is fixed. Cubic yards equals length in feet times width in feet times thickness in feet, all divided by 27. The only place contractors trip is the thickness term. Slab thickness is specified in inches, and the formula needs feet. So a 4-inch slab is not 4 in the formula. It is 0.333 ft. The order of operations is measure, convert thickness to feet, multiply for cubic feet, then divide by 27.<\/p>\n<div class=\"sw__callout\"><strong>The one rule that prevents most short orders:<\/strong> convert thickness to feet before you multiply. A 4-inch slab is 0.333 ft, not 4. Skipping this step inflates volume twelvefold and hides the real short when contractors then re-guess by eye.<\/div>\n<h3>Inches to feet thickness conversion table<\/h3>\n<p>Slab and footing thickness is called out in inches on nearly every plan. The conversion to feet has to happen before the multiplication. The table below converts the common pour thicknesses. Divide any inch value by 12 to get the decimal foot value.<\/p>\n<div class=\"sw__table-wrap\">\n<table class=\"sw__table\">\n<thead>\n<tr>\n<th scope=\"col\">Thickness (inches)<\/th>\n<th scope=\"col\">Thickness (feet)<\/th>\n<th scope=\"col\">Typical use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>3 in<\/td>\n<td>0.25 ft<\/td>\n<td>Thin topping slab, some sidewalks<\/td>\n<\/tr>\n<tr>\n<td>4 in<\/td>\n<td>0.333 ft<\/td>\n<td>Standard residential slab, patio, sidewalk<\/td>\n<\/tr>\n<tr>\n<td>5 in<\/td>\n<td>0.417 ft<\/td>\n<td>Light driveway, garage slab<\/td>\n<\/tr>\n<tr>\n<td>6 in<\/td>\n<td>0.5 ft<\/td>\n<td>Driveway, light commercial slab<\/td>\n<\/tr>\n<tr>\n<td>8 in<\/td>\n<td>0.667 ft<\/td>\n<td>Footing, heavy slab, foundation wall<\/td>\n<\/tr>\n<tr>\n<td>10 in<\/td>\n<td>0.833 ft<\/td>\n<td>Deep footing, grade beam<\/td>\n<\/tr>\n<tr>\n<td>12 in<\/td>\n<td>1.0 ft<\/td>\n<td>Pier, deep footing, thickened edge<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3>Why you divide by 27<\/h3>\n<p>A cubic yard is a cube that measures one yard, or 3 ft, on every side. Its volume is 3 ft times 3 ft times 3 ft, which equals 27 cubic feet. Once a pour is expressed in cubic feet, dividing by 27 converts straight to cubic yards. That is the unit a ready-mix plant quotes and bills in. No rounding hides in the 27. It is an exact unit conversion.<\/p>\n<p class=\"sw__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Price your next pour from a photo, free<\/a><\/p>\n<h2>Add a waste factor of 7 to 10 percent<\/h2>\n<p>The raw formula gives the volume of a perfectly formed pour. In the field that number always runs short. Add 7 to 10 percent on top of the calculated cubic yards. On rough or hand-dug subgrade, push the waste factor toward 10 percent or higher. The ground rarely cuts as clean as the plan assumes.<\/p>\n<h3>Where the concrete actually goes<\/h3>\n<ul>\n<li><strong>Subgrade variation.<\/strong> A slab specified at 4 in pours closer to 4.5 in over a low spot. Every fraction of extra depth adds volume across the whole pad.<\/li>\n<li><strong>Over-excavation.<\/strong> Hand-dug footings and trenches run wider and deeper than the form dimension, so the concrete fills more than the calculated box.<\/li>\n<li><strong>Spillage and waste.<\/strong> Concrete left in the chute, dropped during placement, or stiffening before it moves is gone.<\/li>\n<li><strong>Form deflection.<\/strong> Forms bow outward under the weight of wet concrete, widening the pour past the nominal dimension.<\/li>\n<\/ul>\n<p>A calculated 10.0 cubic yard order becomes a 10.7 to 11.0 yard order once waste is applied. Then it rounds up to 11.0 yards for the truck. Running short on a pour that has already started is the expensive failure. A cold joint or a second short-load delivery costs far more than the extra quarter yard.<\/p>\n<h2>Worked examples: slab, driveway, footing, and sidewalk<\/h2>\n<p>The same formula handles every common pour. Below are four worked examples. Each shows the full chain: measure, convert thickness to feet, multiply, divide by 27, add waste. The free <a href=\"\/blog\/concrete-estimate-template\/\">SimplyWise concrete estimate template<\/a> carries the same line items, so the math repeats job to job.<\/p>\n<h3>Example 1: 4-inch residential slab, 20 ft by 30 ft<\/h3>\n<p>The pad is 20 ft long, 30 ft wide, and 4 in thick. Convert thickness: 4 divided by 12 equals 0.333 ft. Multiply: 20 times 30 times 0.333 equals 200 cubic feet. Divide by 27: 200 divided by 27 equals 7.41 cubic yards. Add 10 percent waste: 7.41 times 1.10 equals 8.15 cubic yards. Order 8.25 cubic yards, rounded up to the nearest quarter yard.<\/p>\n<h3>Example 2: 6-inch driveway, 16 ft by 40 ft<\/h3>\n<p>The driveway is 16 ft wide, 40 ft long, and 6 in thick. Convert thickness: 6 divided by 12 equals 0.5 ft. Multiply: 16 times 40 times 0.5 equals 320 cubic feet. Divide by 27: 320 divided by 27 equals 11.85 cubic yards. Add 8 percent waste: 11.85 times 1.08 equals 12.80 cubic yards. Order 13.0 cubic yards to clear the pad with a small reserve.<\/p>\n<h3>Example 3: continuous footing, 1.5 ft by 60 ft by 12 in<\/h3>\n<p>Footings pour in feet on width and depth, so the conversion is simpler. The footing is 1.5 ft wide, 60 ft long, and 12 in deep, which is 1.0 ft. Multiply: 1.5 times 60 times 1.0 equals 90 cubic feet. Divide by 27: 90 divided by 27 equals 3.33 cubic yards. Add 10 percent waste, because hand-dug trenches over-excavate. That gives 3.67 cubic yards, so order 3.75.<\/p>\n<h3>Example 4: sidewalk, 4 ft by 50 ft by 4 in<\/h3>\n<p>The walk is 4 ft wide, 50 ft long, and 4 in thick, which is 0.333 ft. Multiply: 4 times 50 times 0.333 equals 66.6 cubic feet. Divide by 27: 66.6 divided by 27 equals 2.47 cubic yards. Add 10 percent waste: 2.47 times 1.10 equals 2.72 cubic yards. Order 2.75 cubic yards, rounded up to the nearest quarter yard. On a pour this small, ask the plant for its posted minimum, since a short-load fee can apply either way.<\/p>\n<h2>Reference table: slab size to cubic yards<\/h2>\n<p>For fast field checks, the table below pre-runs the concrete cubic yard calculator. It covers common square and rectangular slabs at 4 in and 6 in thick. These figures are the raw calculated volume before waste. Add 7 to 10 percent on top, then round up for the order.<\/p>\n<div class=\"sw__table-wrap\">\n<table class=\"sw__table\">\n<thead>\n<tr>\n<th scope=\"col\">Slab size<\/th>\n<th scope=\"col\">Area (sq ft)<\/th>\n<th scope=\"col\">Yards at 4 in<\/th>\n<th scope=\"col\">Yards at 6 in<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>10 ft by 10 ft<\/td>\n<td>100<\/td>\n<td>1.23<\/td>\n<td>1.85<\/td>\n<\/tr>\n<tr>\n<td>12 ft by 12 ft<\/td>\n<td>144<\/td>\n<td>1.78<\/td>\n<td>2.67<\/td>\n<\/tr>\n<tr>\n<td>10 ft by 20 ft<\/td>\n<td>200<\/td>\n<td>2.47<\/td>\n<td>3.70<\/td>\n<\/tr>\n<tr>\n<td>20 ft by 20 ft<\/td>\n<td>400<\/td>\n<td>4.94<\/td>\n<td>7.41<\/td>\n<\/tr>\n<tr>\n<td>20 ft by 30 ft<\/td>\n<td>600<\/td>\n<td>7.41<\/td>\n<td>11.11<\/td>\n<\/tr>\n<tr>\n<td>24 ft by 24 ft (2-car garage)<\/td>\n<td>576<\/td>\n<td>7.11<\/td>\n<td>10.67<\/td>\n<\/tr>\n<tr>\n<td>30 ft by 40 ft<\/td>\n<td>1,200<\/td>\n<td>14.81<\/td>\n<td>22.22<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Each figure is the calculated volume before waste. For a working order, multiply by 1.07 to 1.10 and round up. The 20 ft by 30 ft slab at 4 in shows 7.41 yards in the table. That becomes the 8.25-yard order from Example 1 once 10 percent waste and quarter-yard rounding are applied.<\/p>\n<h2>Short-load fees: why rounding up beats ordering short<\/h2>\n<p>Ready-mix plants charge a short-load fee on deliveries below their posted minimum. The threshold and the fee are set plant by plant and by delivery area, so ask the dispatcher for the minimum before you order. It is the most common surprise line on a small-pour invoice. The math on rounding is asymmetric. A quarter yard of extra concrete costs a small fraction of what a second delivery costs. Ordering short risks a second-truck fee plus a cold joint where the first pour set up before the second arrived.<\/p>\n<h3>The short-load math that favors rounding up<\/h3>\n<p>Ordering exactly 7.41 yards on a calculated 7.41-yard slab leaves zero margin for subgrade variation. A single low spot then forces a hand-mix patch or a partial second delivery. Ordering 8.25 yards adds about 0.84 of a yard, which is far cheaper than a return trip. The field rule is simple. Calculate, add waste, round up to the nearest quarter yard, and never order to the exact theoretical number.<\/p>\n<h2>Ordering ready-mix from the plant<\/h2>\n<p>Once the calculator has sized the pour, the order carries more than a yard count. The dispatcher needs the volume, the mix design, and the timing so trucks arrive ready to place. The deeper field workflow lives in the <a href=\"\/blog\/how-to-estimate-concrete-work\/\">SimplyWise guide to estimating concrete work<\/a>. It covers labor, finishing, and pricing on top of the volume math.<\/p>\n<h3>What the plant needs on the order<\/h3>\n<ul>\n<li><strong>Cubic yards.<\/strong> The calculated volume plus the waste factor, rounded up to the nearest quarter yard.<\/li>\n<li><strong>Mix design or strength.<\/strong> The specified compressive strength in psi, commonly 3,000 to 4,000 psi on residential flatwork.<\/li>\n<li><strong>Slump.<\/strong> The workability target, called out by the plan or by the placement method.<\/li>\n<li><strong>Additives.<\/strong> Air entrainment for freeze-thaw climates, accelerator or retarder for temperature, fiber mesh if specified.<\/li>\n<li><strong>Delivery window.<\/strong> The pour start time and the spacing between trucks, so concrete does not stiffen in the drum.<\/li>\n<li><strong>Site access.<\/strong> Chute, pump, or buggy, so the plant sends a truck that can reach the placement point.<\/li>\n<\/ul>\n<p>A clean order pairs the cubic yard figure with the mix spec. That keeps the pour on schedule and avoids a load that arrives wrong for the job.<\/p>\n<h2>Speed up the concrete cubic yard calculator on site<\/h2>\n<p>Most contractors size a pour the same way. Walk the pad, measure with a tape, run the divide-by-27 math in your head, then call the plant from the truck. That works. It also leaves the thickness conversion and the waste factor to memory, which is where short orders start. A phone workflow keeps the math honest.<\/p>\n<h3>Photo to estimate with SimplyWise<\/h3>\n<p>SimplyWise Cost Estimator prices the job from a phone photo on site. The contractor photographs the slab, driveway, footing, or sidewalk and types the measured length, width, and thickness into the project description. The app returns an itemized estimate in about 6 seconds, with material quantities. Every line item carries unit, quantity, and price, so you can adjust a quantity on the spot. On Pro iPhones, a LiDAR room scan captures measurements. You can hand over a professional, branded quote the client signs to approve before the truck is even booked.<\/p>\n<section class=\"sw__promo\">\n<h2>Price the pour before you leave the driveway<\/h2>\n<p>SimplyWise Cost Estimator costs $29.99\/mo or $239.99\/yr. That works out to about $20\/mo on annual. Every plan starts with a 7-day free trial, so you can run it on the next few pours first.<\/p>\n<p><a class=\"sw__btn\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><br \/>\n<\/section>\n<h3>What is included<\/h3>\n<ul>\n<li>Photo to itemized estimate in about 6 seconds.<\/li>\n<li>Estimates that come back with material quantities.<\/li>\n<li>Editable material, labor, and fee line items.<\/li>\n<li>Unit, quantity, and price on every line item.<\/li>\n<li>LiDAR room scans on Pro iPhones to capture measurements.<\/li>\n<li>Professional, branded quotes the client signs to approve.<\/li>\n<\/ul>\n<div class=\"sw__sources\">\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.nrmca.org\/about\/\" rel=\"noopener\" target=\"_blank\">National Ready Mixed Concrete Association, About Ready Mixed Concrete<\/a> (truck-mounted rotating drum mixers carry the overwhelming majority of ready mixed concrete; typical truck mixer is a 9 to 11 cubic yard unit; verified live 2026-08-07).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<section class=\"sw__faq\">\n<div class=\"sw__inner\">\n<h2>Frequently asked questions about the concrete cubic yard calculator<\/h2>\n<h3 class=\"sw__faq-cat\">The formula and conversions<\/h3>\n<details>\n<summary>How do you calculate cubic yards of concrete?<\/summary>\n<div>\n<p>Multiply length in feet by width in feet by thickness in feet, then divide by 27. The 27 converts cubic feet to cubic yards, because a cubic yard is 3 ft by 3 ft by 3 ft. Convert any thickness given in inches to feet first by dividing by 12. A 4-inch slab is 0.333 ft in the formula.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Why do you divide by 27 in the concrete cubic yard calculator?<\/summary>\n<div>\n<p>Because a cubic yard is a cube one yard on each side, and one yard equals 3 ft. The volume is 3 ft times 3 ft times 3 ft, which equals 27 cubic feet. Once the pour is expressed in cubic feet, dividing by 27 converts it to the cubic yards a plant quotes and bills in. It is an exact unit conversion with no rounding.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How do you convert slab thickness from inches to feet?<\/summary>\n<div>\n<p>Divide the inch value by 12. A 3-inch slab is 0.25 ft, a 4-inch slab is 0.333 ft, a 6-inch slab is 0.5 ft, and a 12-inch footing is 1.0 ft. This conversion has to happen before the multiplication, because the formula works in feet on all three dimensions.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"sw__faq-cat\">Waste, rounding, and ordering<\/h3>\n<details>\n<summary>How much waste factor should I add to a concrete order?<\/summary>\n<div>\n<p>Add 7 to 10 percent on top of the calculated cubic yards. The waste covers subgrade variation, over-excavation on hand-dug footings, spillage, and form deflection. On rough or hand-dug subgrade, push toward 10 percent or higher. After adding waste, round up to the nearest quarter yard for the order.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is a short-load fee on a concrete delivery?<\/summary>\n<div>\n<p>A short-load fee is a charge ready-mix plants add to deliveries below their posted minimum. The threshold and the fee are set plant by plant and by delivery area, so ask the dispatcher for the minimum before you order. Because the fee is steep next to the price of extra concrete, the field rule on a small pour is to round up rather than order to the exact theoretical volume.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Is it better to order too much or too little concrete?<\/summary>\n<div>\n<p>Order slightly too much. A quarter yard of extra concrete costs a small fraction of what a second delivery costs. Running short on an active pour risks a cold joint and a second short-load delivery, which together cost far more. Calculate the volume, add 7 to 10 percent waste, round up to the nearest quarter yard, and never order to the exact calculated number.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"sw__faq-cat\">Worked numbers<\/h3>\n<details>\n<summary>How many cubic yards of concrete for a 20 by 30 slab at 4 inches?<\/summary>\n<div>\n<p>20 ft times 30 ft times 0.333 ft equals 200 cubic feet. Divided by 27 that is 7.41 cubic yards calculated. Apply a 10 percent waste factor, which gives 8.15 cubic yards. Round up to the nearest quarter yard and order 8.25 cubic yards.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How many cubic yards for a 24 by 24 two-car garage slab?<\/summary>\n<div>\n<p>A 24 ft by 24 ft slab is 576 sq ft. At 4 in, which is 0.333 ft, that calculates to 7.11 cubic yards. At 6 in, which is 0.5 ft, it calculates to 10.67 cubic yards. Add 7 to 10 percent waste and round up: roughly 8.0 yards at 4 in, or 11.75 yards at 6 in.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"sw__faq-cat\">SimplyWise Cost Estimator<\/h3>\n<details>\n<summary>How much does SimplyWise Cost Estimator cost?<\/summary>\n<div>\n<p>SimplyWise Cost Estimator is $29.99\/mo, or $239.99\/yr, which works out to about $20\/mo on annual. Every plan starts with a 7-day free trial. The plan covers photo to itemized estimate with material quantities, LiDAR room scans on Pro iPhones, and professional branded quotes the client signs to approve.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Can I price a concrete pour from a photo?<\/summary>\n<div>\n<p>Yes. SimplyWise Cost Estimator turns a photo of the slab, driveway, footing, or sidewalk into an itemized estimate in about 6 seconds, with material quantities. The app does not take measurements off a photo, so type the length, width, and thickness into the project description. On Pro iPhones, a LiDAR room scan captures measurements. Every line item is editable, so you can adjust quantities before you send the quote.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/section>\n<section class=\"sw__final\">\n<div class=\"sw__inner\">\n<span class=\"sw__eyebrow\">Size the pour on site<\/span><\/p>\n<h2>Size your next concrete pour without the tailgate guesswork<\/h2>\n<p>The contractor who sizes the pour, applies the waste factor, and quotes on site orders once and pours clean. SimplyWise Cost Estimator is free to try, with a 7-day free trial.<\/p>\n<p><a class=\"sw__btn sw__btn--lg\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><\/p>\n<\/div>\n<\/section>\n<\/article>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"headline\": \"Concrete Cubic Yard Calculator for Contractors\",\n  \"description\": \"Concrete cubic yard calculator for contractors: the length times width times thickness divided by 27 formula, an inches-to-feet table, a 7 to 10 percent waste factor, and worked examples for slabs, driveways, footings, and sidewalks.\",\n  \"author\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\"},\n  \"publisher\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\", \"logo\": {\"@type\": \"ImageObject\", \"url\": \"https:\/\/www.simplywise.com\/icon-512x512.png\"}},\n  \"datePublished\": \"2026-08-07\",\n  \"dateModified\": \"2026-08-07\",\n  \"mainEntityOfPage\": \"https:\/\/simplywise.com\/blog\/concrete-cubic-yard-calculators\/\",\n  \"image\": \"https:\/\/images.unsplash.com\/photo-1527410651988-c2f385ccd3f7?w=1400&h=700&fit=crop&q=80&auto=format\"\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"HowTo\",\n  \"name\": \"How to use a concrete cubic yard calculator\",\n  \"description\": \"A step-by-step method for contractors to size a concrete pour in cubic yards: measure and convert dimensions to feet, multiply for cubic feet, divide by 27, add a 7 to 10 percent waste factor, round up, and give the plant the mix details.\",\n  \"totalTime\": \"PT5M\",\n  \"tool\": [\n    {\"@type\": \"HowToTool\", \"name\": \"Tape measure or laser measure\"},\n    {\"@type\": \"HowToTool\", \"name\": \"Calculator\"},\n    {\"@type\": \"HowToTool\", \"name\": \"SimplyWise Cost Estimator app\"}\n  ],\n  \"step\": [\n    {\"@type\": \"HowToStep\", \"position\": 1, \"name\": \"Measure and convert to feet\", \"text\": \"Measure the length, width, and thickness of the pour. Convert every dimension to feet. Slab and footing thickness is usually called out in inches, so divide the inch value by 12. A 4-inch slab is 0.333 ft.\"},\n    {\"@type\": \"HowToStep\", \"position\": 2, \"name\": \"Multiply for cubic feet\", \"text\": \"Multiply length in feet times width in feet times thickness in feet to get the volume in cubic feet.\"},\n    {\"@type\": \"HowToStep\", \"position\": 3, \"name\": \"Divide by 27 for cubic yards\", \"text\": \"Divide the cubic feet result by 27. A cubic yard is 3 ft by 3 ft by 3 ft, which equals 27 cubic feet, so dividing by 27 converts to the cubic yards a ready-mix plant quotes in.\"},\n    {\"@type\": \"HowToStep\", \"position\": 4, \"name\": \"Add a waste factor\", \"text\": \"Add 7 to 10 percent to the calculated cubic yards to cover subgrade variation, over-excavation, spillage, and form deflection. Push toward 10 percent or higher on rough or hand-dug subgrade.\"},\n    {\"@type\": \"HowToStep\", \"position\": 5, \"name\": \"Round up to the nearest quarter yard\", \"text\": \"Round the result up to the nearest quarter yard. A quarter yard of extra concrete costs far less than a short-load delivery or a cold joint.\"},\n    {\"@type\": \"HowToStep\", \"position\": 6, \"name\": \"Give the plant the full order\", \"text\": \"Call the volume through with the mix design or strength, the slump, any additives, the delivery window, and the site access so the right truck arrives ready to place.\"}\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\": \"Question\", \"name\": \"How do you calculate cubic yards of concrete?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Multiply length in feet by width in feet by thickness in feet, then divide by 27. The 27 converts cubic feet to cubic yards, because a cubic yard is 3 ft by 3 ft by 3 ft. Convert any thickness given in inches to feet first by dividing by 12. A 4-inch slab is 0.333 ft in the formula.\"}},\n    {\"@type\": \"Question\", \"name\": \"Why do you divide by 27 in the concrete cubic yard calculator?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Because a cubic yard is a cube one yard on each side, and one yard equals 3 ft. The volume is 3 ft times 3 ft times 3 ft, which equals 27 cubic feet. Once the pour is expressed in cubic feet, dividing by 27 converts it to the cubic yards a plant quotes and bills in. It is an exact unit conversion with no rounding.\"}},\n    {\"@type\": \"Question\", \"name\": \"How do you convert slab thickness from inches to feet?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Divide the inch value by 12. A 3-inch slab is 0.25 ft, a 4-inch slab is 0.333 ft, a 6-inch slab is 0.5 ft, and a 12-inch footing is 1.0 ft. This conversion has to happen before the multiplication, because the formula works in feet on all three dimensions.\"}},\n    {\"@type\": \"Question\", \"name\": \"How much waste factor should I add to a concrete order?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Add 7 to 10 percent on top of the calculated cubic yards. The waste covers subgrade variation, over-excavation on hand-dug footings, spillage, and form deflection. On rough or hand-dug subgrade, push toward 10 percent or higher. After adding waste, round up to the nearest quarter yard for the order.\"}},\n    {\"@type\": \"Question\", \"name\": \"What is a short-load fee on a concrete delivery?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A short-load fee is a charge ready-mix plants add to deliveries below their posted minimum. The threshold and the fee are set plant by plant and by delivery area, so ask the dispatcher for the minimum before you order. Because the fee is steep next to the price of extra concrete, the field rule on a small pour is to round up rather than order to the exact theoretical volume.\"}},\n    {\"@type\": \"Question\", \"name\": \"Is it better to order too much or too little concrete?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Order slightly too much. A quarter yard of extra concrete costs a small fraction of what a second delivery costs. Running short on an active pour risks a cold joint and a second short-load delivery, which together cost far more. Calculate the volume, add 7 to 10 percent waste, round up to the nearest quarter yard, and never order to the exact calculated number.\"}},\n    {\"@type\": \"Question\", \"name\": \"How many cubic yards of concrete for a 20 by 30 slab at 4 inches?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"20 ft times 30 ft times 0.333 ft equals 200 cubic feet. Divided by 27 that is 7.41 cubic yards calculated. Apply a 10 percent waste factor, which gives 8.15 cubic yards. Round up to the nearest quarter yard and order 8.25 cubic yards.\"}},\n    {\"@type\": \"Question\", \"name\": \"How many cubic yards for a 24 by 24 two-car garage slab?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 24 ft by 24 ft slab is 576 sq ft. At 4 in, which is 0.333 ft, that calculates to 7.11 cubic yards. At 6 in, which is 0.5 ft, it calculates to 10.67 cubic yards. Add 7 to 10 percent waste and round up: roughly 8.0 yards at 4 in, or 11.75 yards at 6 in.\"}},\n    {\"@type\": \"Question\", \"name\": \"How much does SimplyWise Cost Estimator cost?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"SimplyWise Cost Estimator is $29.99\/mo, or $239.99\/yr, which works out to about $20\/mo on annual. Every plan starts with a 7-day free trial. The plan covers photo to itemized estimate with material quantities, LiDAR room scans on Pro iPhones, and professional branded quotes the client signs to approve.\"}},\n    {\"@type\": \"Question\", \"name\": \"Can I price a concrete pour from a photo?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. SimplyWise Cost Estimator turns a photo of the slab, driveway, footing, or sidewalk into an itemized estimate in about 6 seconds, with material quantities. The app does not take measurements off a photo, so type the length, width, and thickness into the project description. On Pro iPhones, a LiDAR room scan captures measurements. Every line item is editable, so you can adjust quantities before you send the quote.\"}}\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"itemListElement\": [\n    {\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Blog\", \"item\": \"https:\/\/simplywise.com\/blog\/\"},\n    {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Concrete\", \"item\": \"https:\/\/simplywise.com\/blog\/category\/concrete\/\"},\n    {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Concrete Cubic Yard Calculator\", \"item\": \"https:\/\/simplywise.com\/blog\/concrete-cubic-yard-calculators\/\"}\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Blog &nbsp;&rsaquo;&nbsp; Concrete &nbsp;&rsaquo;&nbsp; Concrete Cubic Yard Calculator Concrete &middot; Estimating Guide Concrete Cubic Yard Calculator for Contractors The field formula every contractor needs to size a concrete pour: length times width times thickness divided by 27, with a conversion table, a waste factor, and worked examples. In a hurry? Price a job from a [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"concrete cubic yard calculator","_yoast_wpseo_title":"Concrete Cubic Yard Calculator (2026 Guide)","_yoast_wpseo_metadesc":"Concrete cubic yard calculator for contractors: the divide-by-27 formula, waste factor, worked examples, and a slab-size-to-yards reference table.","_yoast_wpseo_linkdex":"76","_yoast_wpseo_content_score":"90","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[177],"tags":[],"class_list":["post-6817","post","type-post","status-publish","format-standard","hentry","category-free-templates"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Concrete Cubic Yard Calculator (2026 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