{"id":2363,"date":"2024-03-14T14:05:31","date_gmt":"2024-03-14T14:05:31","guid":{"rendered":"https:\/\/www.cleverpatio.com\/?p=2363"},"modified":"2024-03-14T14:05:31","modified_gmt":"2024-03-14T14:05:31","slug":"free-concrete-slab-bags-needed-calculator","status":"publish","type":"post","link":"https:\/\/www.cleverpatio.com\/free-concrete-slab-bags-needed-calculator\/","title":{"rendered":"Free Concrete Slab + Bags Needed Calculator"},"content":{"rendered":"\n<p>If you are thinking of building a greenhouse, shed, garage, or covering your patio with cement but are not sure if the concrete slab you are considering should be included in your budget take a look at our calculator. <\/p>\n\n\n\n<p>We have worked hard to calculate all costs related to having a concrete slab poured for your next project. Of course, there are many variables that could affect the final price but we feel that this calculator will get relatively close for most situations.<\/p>\n\n\n\n<p>The following instructions will help guide you through the process of using our Free Concrete Slab + Bags Needed Calculator.<\/p>\n\n\n\n<p>This Calculator includes:<\/p>\n\n\n\n<ul><li>Curb Calculator<\/li><li>Footings Calculator<\/li><li>Concrete Bags Calculator<\/li><li>Concrete Slab Thickness Calculator<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Free Concrete Slab + Bags Needed<\/h2>\n\n\n\n<p><iframe src=\"https:\/\/concalculator.com\/concrete-calculator\/?calculator&#038;title\" id=\"iframe_calculator\" name=\"iframe_calculator\" style=\"width:100%;height:3934px;border:none;margin-bottom: 0;\"><\/iframe><span style=\"width: 100%;height: 30px;display: flex;justify-content: center;background-color:#DBDBFF;color: #969DBE;font-size: 14px;font-family: arial;line-height: 30px;top: -7px;position: relative;\"><\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Concrete calculator formula<\/h2>\n\n\n\n<p>Using the measurements provided, our calculator first works out the volume of the required concrete mix using the formulae given below.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Slabs, Footings and Walls<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/concalculator.com\/wp-content\/uploads\/2019\/07\/Concrete-Calculator-Slabs-Footings-and-Walls.jpg\" alt=\"Concrete Calculator - Slabs, Footings and Walls\" class=\"wp-image-1048\"\/><\/figure>\n\n\n\n<p>The&nbsp;<strong>total volume&nbsp;<\/strong>is calculated using the formula:<\/p>\n\n\n\n<p>Volume=Length\u00d7Width\u00d7Thickness<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Holes &amp; Columns<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/concalculator.com\/wp-content\/uploads\/2019\/07\/Concrete-Calculator-Holes-Columns.jpg\" alt=\"Concrete Calculator - Holes &amp; Columns\" class=\"wp-image-1049\"\/><\/figure>\n\n\n\n<p>The&nbsp;<strong>total volume&nbsp;<\/strong>is calculated using the formula:<\/p>\n\n\n\n<p>Volume=\u03c0\u00d7Radius2\u00d7DepthVolume=\u03c0\u00d7Radius2\u00d7Depth<\/p>\n\n\n\n<p>Where<\/p>\n\n\n\n<p>Radius=Diameter2Radius=Diameter2<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Circular Slabs and Tubes<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/concalculator.com\/wp-content\/uploads\/2019\/07\/Concrete-Calculator-Circular-Slabs-and-Tubes.jpg\" alt=\"Concrete Calculator - Circular Slabs and Tubes\" class=\"wp-image-1050\"\/><\/figure>\n\n\n\n<p>The&nbsp;<strong>total volume&nbsp;<\/strong>is calculated using the formula:<\/p>\n\n\n\n<p>Volume=\u03c0\u00d7(Outerradius2\u2013Innerradius2)\u00d7HeightVolume=\u03c0\u00d7(Outerradius2\u2013Innerradius2)\u00d7Height<\/p>\n\n\n\n<p>Where<\/p>\n\n\n\n<p>Radius=Diameter2Radius=Diameter2<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Curb &amp; Gutter Barrier<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/concalculator.com\/wp-content\/uploads\/2019\/07\/Concrete-Calculator-Curb-Gutter-Barrier.jpg\" alt=\"Concrete Calculator - Curb &amp; Gutter Barrier\" class=\"wp-image-1051\"\/><\/figure>\n\n\n\n<p>The&nbsp;<strong>total volume&nbsp;<\/strong>is calculated using the formula:<\/p>\n\n\n\n<p>Volume=Curbvolume+GuttervolumeVolume=Curbvolume+Guttervolume<\/p>\n\n\n\n<p>Where<\/p>\n\n\n\n<p>Curbvolume=Curbdepth\u00d7Curbheight\u00d7LengthCurbvolume=Curbdepth\u00d7Curbheight\u00d7Length<\/p>\n\n\n\n<p>and<\/p>\n\n\n\n<p>Guttervolume=(Gutterwidth+Curbdepth)\u00d7Flagthickness\u00d7LengthGuttervolume=(Gutterwidth+Curbdepth)\u00d7Flagthickness\u00d7Length<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stairs<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/concalculator.com\/wp-content\/uploads\/2019\/07\/Concrete-Calculator-Stairs.jpg\" alt=\"Concrete Calculator - Stairs\" class=\"wp-image-1052\"\/><\/figure>\n\n\n\n<p>The&nbsp;<strong>total volume&nbsp;<\/strong>is calculated using the formula:<\/p>\n\n\n\n<p>Volume=Volumeunderplatform+VolumeunderstepsVolume=Volumeunderplatform+Volumeundersteps<\/p>\n\n\n\n<p>Volumeunderplatform=Platformdepth\u00d7Rise\u00d7Width\u00d7NumberofstepsVolumeunderplatform=Platformdepth\u00d7Rise\u00d7Width\u00d7Numberofsteps<\/p>\n\n\n\n<p>Volumeunderstep=Run\u00d7Rise\u00d7Width\u00d7NumberofStepVolumeunderstep=Run\u00d7Rise\u00d7Width\u00d7NumberofStep<\/p>\n\n\n\n<p><strong>Note &#x26a0;&#xfe0f;<\/strong><\/p>\n\n\n\n<p>If there are multiple steps, separately calculate the volume under the steps for each and then sum to find the&nbsp;<strong>total volume under the steps&nbsp;<\/strong>(<a href=\"https:\/\/concalculator.com\/concrete-calculator\/#The_volume_of_4_steps\">more details in the example<\/a>).<\/p>\n\n\n\n<p><strong>Want to know the best part?<\/strong><\/p>\n\n\n\n<p>If you need to construct multiple concrete slabs\/columns, etc., then our calculator can work out the&nbsp;<strong>total volume&nbsp;<\/strong>required:<\/p>\n\n\n\n<p>Totalvolume=Volume\u00d7QuantityTotalvolume=Volume\u00d7Quantity<\/p>\n\n\n\n<p>Our calculator also works out the total concrete mix weight and required number of bags (using a standard 40lb bag of concrete which weights 145 pounds per cubic foot):<\/p>\n\n\n\n<p>Weight=Totalvolume\u00d7145lb\/ft3Weight=Totalvolume\u00d7145lb\/ft3<\/p>\n\n\n\n<p>Bags=Weight40lbBags=Weight40lb<\/p>\n\n\n\n<p>Also, if you know the price per unit volume, then our calculator can work out the total cost:<\/p>\n\n\n\n<p>Cost=Totalvolume\u00d7PriceperunitofvolumeCost=Totalvolume\u00d7Priceperunitofvolume<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">But what happens if I\u2019m measuring in different units?<\/h2>\n\n\n\n<p>It\u2019s likely that you are wondering what to do if your units aren\u2019t in feet and pounds.<\/p>\n\n\n\n<p><strong>Well, the solution couldn\u2019t be easier!<\/strong><\/p>\n\n\n\n<p>Our calculator can do all the conversions for you, meaning you don\u2019t have to.<\/p>\n\n\n\n<p>For each measurement of length, you are able to work in&nbsp;<strong>metric units&nbsp;<\/strong>(feet, yards, inches) or&nbsp;<strong>imperial units<\/strong>&nbsp;(centimeters, meters).<\/p>\n\n\n\n<p>Weight can be given in pounds (lb), US short tons (t), imperial-long tons (long t) or kilograms.<\/p>\n\n\n\n<p>Simply select the desired units in the drop down options and our concrete calculator will do the following conversions:<\/p>\n\n\n\n<p>1ft=12in=0.33yd=30.48cm=0.3048m1ft=12in=0.33yd=30.48cm=0.3048m<\/p>\n\n\n\n<p>1t=2000lb=0.893longton=907kg1t=2000lb=0.893longton=907kg<\/p>\n\n\n\n<p>1ft3=1728in3=0.037yd3=28,317cm3=0.0283m31ft3=1728in3=0.037yd3=28,317cm3=0.0283m3<\/p>\n\n\n\n<p>Please note, other standard unit conversions that might be helpful are:<\/p>\n\n\n\n<p>145lb\/ft3=2400kg\/m3=3915lb\/yd3145lb\/ft3=2400kg\/m3=3915lb\/yd3<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Example calculations<\/h2>\n\n\n\n<p>Before we begin please note: The number of bags required&nbsp;<strong>must&nbsp;<\/strong>be rounded up, otherwise you\u2019ll be left without sufficient concrete.<\/p>\n\n\n\n<p>You\u2019ll notice that we do this with all our examples (but the calculator does this for you!).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Standard wall slab<\/h3>\n\n\n\n<p>Let\u2019s say I need to construct a square concrete slab that is 12 feet wide (an area of 144 square feet) and 4 inches deep.<\/p>\n\n\n\n<p>I want to calculate how many 40 lb bags of concrete I need.<\/p>\n\n\n\n<p>The calculator would perform the following calculations to calculate that the slab would need 174 bags:<\/p>\n\n\n\n<p>Volume=Length\u00d7Width\u00d7Thickness=12ft\u00d712ft\u00d74in=48ft3Volume=Length\u00d7Width\u00d7Thickness=12ft\u00d712ft\u00d74in=48ft3<\/p>\n\n\n\n<p>Weight=Totalvolume\u00d7145lb\/ft3=48ft3\u00d7145=6960lbWeight=Totalvolume\u00d7145lb\/ft3=48ft3\u00d7145=6960lb<\/p>\n\n\n\n<p>Bags=Weight40lb=6960lb40lb=174bagsBags=Weight40lb=6960lb40lb=174bags<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5 columns<\/h3>\n\n\n\n<p>Let\u2019s say I need to construct 5 columns measuring 2 feet in diameter and 3 inches high. I want to estimate how many 40lb bags of concrete I need.<\/p>\n\n\n\n<p>The gravel estimator does the following calculations:<\/p>\n\n\n\n<p>Volume=\u03c0\u00d7Radius2\u00d7Depth=\u03c0\u00d71ft2\u00d73in=0.7854ft3Volume=\u03c0\u00d7Radius2\u00d7Depth=\u03c0\u00d71ft2\u00d73in=0.7854ft3<\/p>\n\n\n\n<p>Totalvolume=Volume\u00d7Quantity=0.7854ft3\u00d75=3927ft3Totalvolume=Volume\u00d7Quantity=0.7854ft3\u00d75=3927ft3<\/p>\n\n\n\n<p>Weight=Totalvolume\u00d7145lb\/ft3=3927ft3\u00d7145=569lbWeight=Totalvolume\u00d7145lb\/ft3=3927ft3\u00d7145=569lb<\/p>\n\n\n\n<p>Bags=Weight40lb=569lb40lb=14.2\u219215bagsBags=Weight40lb=569lb40lb=14.2\u219215bags<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Circular slab with price per unit of volume<\/h3>\n\n\n\n<p>I want to construct a circular slab of concrete measuring 5 ft high.<\/p>\n\n\n\n<p>I want to figure out how many bags of 40 lb concrete I need to do this.<\/p>\n\n\n\n<p>The outer diameter is 10 ft and the inner diameter is 9 ft. The price of the concrete is $108 per cubic yard.<\/p>\n\n\n\n<p>The ready mix concrete calculator does the following calculations:<\/p>\n\n\n\n<p>Volume=\u03c0\u00d7(Outerradius2\u2013Innerradius2)\u00d7Height=\u03c0\u00d7(5ft2\u20134.5ft2)\u00d75ft=74.6ft3Volume=\u03c0\u00d7(Outerradius2\u2013Innerradius2)\u00d7Height=\u03c0\u00d7(5ft2\u20134.5ft2)\u00d75ft=74.6ft3<\/p>\n\n\n\n<p>Weight=Volume\u00d7145lb\/ft3=74.6ft3\u00d7145=10819lbWeight=Volume\u00d7145lb\/ft3=74.6ft3\u00d7145=10819lb<\/p>\n\n\n\n<p>Bags=Weight40lb=10819lb40lb=270.4\u2192271bagsBags=Weight40lb=10819lb40lb=270.4\u2192271bags<\/p>\n\n\n\n<p>Cost=Volume\u00d7Priceperunitofvolume=74.6ft3\u00d7108$\/yd3=$298.45Cost=Volume\u00d7Priceperunitofvolume=74.6ft3\u00d7108$\/yd3=$298.45<\/p>\n\n\n\n<p><strong>But wait, there\u2019s more!<\/strong><\/p>\n\n\n\n<p>We imagine you are wondering what happens if you want to use concrete bags weigh different amounts. &#x1f914;<\/p>\n\n\n\n<p>Well, our calculator can figure this out for you as well.<\/p>\n\n\n\n<p>Simply select from the multiple options in the drop-down menu to select a different weight.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4 curbs with price per unit volume and 50 lb bags of concrete<\/h3>\n\n\n\n<p>For our next example, let\u2019s say we need to construct 4 curbs with the following measurements:<\/p>\n\n\n\n<p>CurbDepth=3inCurbDepth=3in<\/p>\n\n\n\n<p>CurbHeight=4inCurbHeight=4in<\/p>\n\n\n\n<p>GutterWidth=10inGutterWidth=10in<\/p>\n\n\n\n<p>FlagThickness=3inFlagThickness=3in<\/p>\n\n\n\n<p>Length=10ftLength=10ft<\/p>\n\n\n\n<p>The calculator would first work out the&nbsp;<strong>total volume of the 4 curbs<\/strong>:<\/p>\n\n\n\n<p>Curbvolume=Curbdepth\u00d7Curbheight\u00d7Length=3in\u00d74in\u00d710ft=0.8333ft3Curbvolume=Curbdepth\u00d7Curbheight\u00d7Length=3in\u00d74in\u00d710ft=0.8333ft3<\/p>\n\n\n\n<p>Guttervolume=(Gutterwidth+Curbdepth)\u00d7Flagthickness\u00d7Length=(10in+3in)\u00d73in\u00d710ft=2.7083ft3Guttervolume=(Gutterwidth+Curbdepth)\u00d7Flagthickness\u00d7Length=(10in+3in)\u00d73in\u00d710ft=2.7083ft3<\/p>\n\n\n\n<p>Volume=Curbvolume+Guttervolume=0.8333ft3+2.7083ft3=3.54ft3Volume=Curbvolume+Guttervolume=0.8333ft3+2.7083ft3=3.54ft3<\/p>\n\n\n\n<p>Totalvolume=Volume\u00d7Quantity=3.54ft3\u00d74=14.167ft3Totalvolume=Volume\u00d7Quantity=3.54ft3\u00d74=14.167ft3<\/p>\n\n\n\n<p>Then, just as with the previous examples, the calculator would perform similar calculations to work out&nbsp;<strong>total weight, number of 50 lb bags and total cost.<\/strong><\/p>\n\n\n\n<p>Weight=Totalvolume\u00d7145lb\/ft3=14.167ft3\u00d7145=2054lbWeight=Totalvolume\u00d7145lb\/ft3=14.167ft3\u00d7145=2054lb<\/p>\n\n\n\n<p>Bags=Weight50lb=2054lb50lb=41.08\u219242bagsBags=Weight50lb=2054lb50lb=41.08\u219242bags<\/p>\n\n\n\n<p>Cost=Totalvolume\u00d7Priceperunitofvolume=14.167ft3\u00d7108$\/yd3=$56.67Cost=Totalvolume\u00d7Priceperunitofvolume=14.167ft3\u00d7108$\/yd3=$56.67<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The volume of 4 steps<\/h3>\n\n\n\n<p>In our final example, let\u2019s say we have 3 steps leading up to a platform (for a total of 4 steps), with the following measurements:<\/p>\n\n\n\n<p>Rise=7yardsRise=7yards<\/p>\n\n\n\n<p>Run=5yardsRun=5yards<\/p>\n\n\n\n<p>Platformdepth=8yardsPlatformdepth=8yards<\/p>\n\n\n\n<p>Width=9yardsWidth=9yards<\/p>\n\n\n\n<p>Numberofsteps=4Numberofsteps=4<\/p>\n\n\n\n<p>The calculator first works out the volume under the platform:<\/p>\n\n\n\n<p>Volumeunderplatform=Platformdepth\u00d7Rise\u00d7Width\u00d7Numberofsteps=8\u00d77\u00d79\u00d74=2016yd3Volumeunderplatform=Platformdepth\u00d7Rise\u00d7Width\u00d7Numberofsteps=8\u00d77\u00d79\u00d74=2016yd3<\/p>\n\n\n\n<p>Then, it uses the following formula to calculate the volume (in cubic yards) under each step:<\/p>\n\n\n\n<p>Volumeunderstep=Run\u00d7Rise\u00d7Width\u00d7NumberofStepVolumeunderstep=Run\u00d7Rise\u00d7Width\u00d7NumberofStep<\/p>\n\n\n\n<p>Therefore:<\/p>\n\n\n\n<p>Volumeunderstep1=Run\u00d7Rise\u00d7Width\u00d7NumberofStep=5\u00d77\u00d79\u00d71=315yd3Volumeunderstep1=Run\u00d7Rise\u00d7Width\u00d7NumberofStep=5\u00d77\u00d79\u00d71=315yd3<\/p>\n\n\n\n<p>Volumeunderstep2=Run\u00d7Rise\u00d7Width\u00d7NumberofStep=5\u00d77\u00d79\u00d72=630yd3Volumeunderstep2=Run\u00d7Rise\u00d7Width\u00d7NumberofStep=5\u00d77\u00d79\u00d72=630yd3<\/p>\n\n\n\n<p>Volumeunderstep3=Run\u00d7Rise\u00d7Width\u00d7NumberofStep=5\u00d77\u00d79\u00d73=945yd3Volumeunderstep3=Run\u00d7Rise\u00d7Width\u00d7NumberofStep=5\u00d77\u00d79\u00d73=945yd3<\/p>\n\n\n\n<p>Finally, the calculator sums up the volume under the platform and each step to calculate the&nbsp;<strong>total volume in cubic yards:<\/strong><\/p>\n\n\n\n<p>Totalvolume=Volumeunderplatform+Volumeundersteps=2016yd3+315yd3+630yd3+945yd3=3906yd3Totalvolume=Volumeunderplatform+Volumeundersteps=2016yd3+315yd3+630yd3+945yd3=3906yd3<\/p>\n\n\n\n<p>Our online concrete calculator is a powerful tool that you can use to help ensure your next landscaping project goes smoothly.<\/p>\n\n\n\n<p>Don\u2019t forget, it can be helpful to purchase slightly more concrete than the volume the estimator calculates to allow for spillage and alterations in slab depth.<\/p>\n\n\n\n<p>This dramatically reduces the probability of having an insufficient concrete mix.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you are thinking of building a greenhouse, shed, garage, or covering your patio with cement but are not sure if the concrete slab you are considering should be included in your budget take a look at our calculator. <\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"single-with-sidebar","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/posts\/2363"}],"collection":[{"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/comments?post=2363"}],"version-history":[{"count":1,"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/posts\/2363\/revisions"}],"predecessor-version":[{"id":6147,"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/posts\/2363\/revisions\/6147"}],"wp:attachment":[{"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/media?parent=2363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/categories?post=2363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cleverpatio.com\/wp-json\/wp\/v2\/tags?post=2363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}