The outer diameter is 10 ft and the inner diameter is 9 ft. Why Are There So Many Stink Bugs in My House? Mortar Mix Type S, Fine Plaster Sand Remember, any time you’re planning on digging a deep hole in your yard, it’s a good idea to call your local utilities to come mark your underground wires and pipes. Instead of putting up an entire fence, build a barrier with wood panels. Fast Setting Concrete Mix, 5000 Plus Concrete Mix Leveling Sand This calculator is based on a 3/8" mortar joint. The diameter of your post hole should be three times the diameter of your post. If you’re curious about what permits you might need for a fence project, you can reach out to your local building inspector’s office or read our handy reference here. Shore up those sagging posts with concrete. In our final example, let’s say we have 3 steps leading up to a platform (for a total of 4 steps), with the following measurements: The calculator first works out the volume under the platform: $$Volume\,under\,platform = Platform\,depth \times Rise × Width \times Number\,of\,steps = 8 \times 7 \times 9 \times 4 = 2016\,yd^3$$. Make the calculations and see the changes. Pre-Mix Bag Concrete Yield The following table shows the approximate yield of mixed concrete for common bag weights. Don't miss HGTV in your favorite social media feeds. All rights reserved. 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Real-time graphics. Our example post will require two bags for every post if you’re using fast-setting concrete. So, six-foot-high fence posts ideally need to be buried three feet into the ground. 2, 2.25, or .5), Sand Mix Here’s what you need to get everything upright and strong. Fast-setting concrete is generally hardened off in about 20 to 60 minutes, depending on the outside temperature, and is usually cured enough to begin work in about four to six hours. Our calculator can do all the conversions for you, meaning you don’t have to. Your concrete will cure evenly when temperatures are mild and the water is at a tepid temperature. bags for one cubic yard. Don’t 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. Stake your post in place with two braces and pour your dry concrete into the hole, surrounding the post up to about three inches below the lip. Let’s say I need to construct 5 columns measuring 2 feet in diameter and 3 inches high. Paver Base Sand, All Weather Blacktop Patch Privacy Policy. © 2020 Discovery or its subsidiaries and affiliates. The ready mix concrete calculator does the following calculations: $$Volume = \pi \times (Outer\,radius^2 – Inner\,radius^2) \times Height = \pi \times (5\,ft^2 – 4.5\,ft^2) \times 5\,ft = 74.6\,ft^3$$, $$Weight = Volume \times 145\,lb/ft^3 = 74.6\,ft^3 \times 145 = 10819\,lb$$, $$Bags = {Weight \over 40\,lb} = {10819\,lb \over 40\,lb} = 270.4 \rightarrow 271\,bags$$, $$Cost = Volume \times Price\,per\,unit\,of\,volume = 74.6\,ft^3 \times 108\,/yd^3 = 298.45$$, We imagine you are wondering what happens if you want to use concrete bags weighing different amounts. Simply select from the multiple options in the drop down menu to select a different weight. Weight can be given in pounds (lb), US short tons (t), imperial-long tons (long t) or kilograms. PRO-X180 Rapid Strength Concrete Mix, Polymeric Paver Sand Knowing how deep your fence post needs to be is determined by the desired height of your fence. Countertop Mix Calculated results will reflect how many bags are needed for Block and Brick. If you need to construct multiple concrete slabs/columns, etc., then our calculator can work out the total volume required: $$Total\,volume = Volume \times Quantity$$. Please note, other standard unit conversions that might be helpful are: $$145\,lb/ft^3 = 2400\,kg/m^3 = 3915\,lb/yd^3$$. Free online concrete calculator for your construction projects. Well, our calculator can figure this out for you as well. Since bags are only sold in whole (not half, or quarter) quantities, you’ll need to purchase three (3) 60-lb. A wood fence can be a great way to give a home a definitive border. For a six-foot-high fence post, we would need a hole that’s 36 inches deep and 12 inches in diameter. Flo-Coat Concrete Resurfacer. Not only will our calculator tell you how much concrete is required, it will also work out how many bags you will need and the total cost of the project. bag (yielding a total of 5.1 cubic feet) of concrete to allow enough for extra. You’ll notice that we do this with all our examples (but the calculator does this for you!). The calculator will then tell you the number of bags you need based on the different size of bags we carry. Once you’ve finished digging your post holes, add about three to four inches of gravel into the bottom and compact it using a post or a 2x4. Mason Sand So, if you’re planning on using a four-inch round or 4x4-inch square post, your post hole will need to be 12 inches in diameter. I want to calculate how many 40 lb bags of concrete I need. All yields are approximate and do not include an allowance for waste, uneven subgrade or any other variations from the joint size and brick and block sizes noted above. . Crack Resistant Concrete Mix, Fence Post Mix Enter the number of bricks (8" x 2" x 4") or blocks (8" x 8" x16") in the box below that you plan to use for your project. Our online concrete calculator is a powerful tool that you can use to help ensure your next landscaping project goes smoothly. Here’s our breakdown of how to make sure you build a strong fence. It also changes the look of the house. bags and one 40 lb. For our next example, let’s say we need to construct 4 curbs with the following measurements: The calculator would first work out the total volume of the 4 curbs: $$Curb\,volume = Curb\,depth \times Curb\,height \times Length = 3\,in \times 4\,in \times 10\,ft = 0.8333\,ft^3$$, $$Gutter\,volume = (Gutter\,width + Curb\,depth) \times Flag\,thickness \times Length = (10\,in + 3\,in) \times 3\,in \times 10\,ft = 2.7083\,ft^3$$, $$Volume = Curb\,volume + Gutter\,volume = 0.8333\,ft^3 + 2.7083\,ft^3 = 3.54\,ft^3$$, $$Total\,volume = Volume \times Quantity = 3.54\,ft^3 \times 4 = 14.167\,ft^3$$.

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