Divide the resulting number by 27 to find cubic yards.Multiply length by width, and then by thickness.To calculate the amount of concrete you need for a slab, you should find the cubic yardage of the area you will be filling. How do I calculate how much concrete I need for a slab? Always plan to buy a few bags more than the exact required amount in case of mistakes. It takes about 41 bags of concrete to fill a cubic yard. How many 80lb bags of concrete make a yard? The cost of concrete per cubic yard depends on which brand you purchase, but usually costs about $110 for bags. How much is a truckload of concrete?Ī truckload of concrete can usually hold a maximum of 10 cubic yards. Two 60lb-bags of concrete cover an area of about 2 square feet for a slab that is 6 inches thick. One 80lb-bag covers an area of about 2 square feet, for a slab 4 inches thick. Divide the resulting number by 27 to find cubic yards. Multiply length by width, and then by thickness. Just follow these steps: Measure the area in feet. The amount of concrete you need varies by project. To calculate the amount of concrete you need for a slab, you should find the cubic yardage of the area you will be filling. Additional tasks: if pros need to remove debris, get rid of your existing patio or dig before starting, it will be more expensive.įAQ How much concrete do I need? How many bags do I need?.Extra strength: adding rebar or mesh to the concrete will up the cost.Labor prices: jobs that take longer and need more workers will have a higher price.Materials: polymer concrete is often more expensive.How complicated the project is: stairs will likely cost more than a slab, for example.There are several things that can affect the cost of your concrete project, including: For smaller jobs, like setting posts for fences or small curbs, mixing bags of concrete should be sufficient.Īlways make sure to order a little extra concrete in case of mistakes or uneven ground. If you have a larger job, like a building a driveway or pool deck, it’s probably best to order concrete by the cubic yard or hire a concrete delivery service. Benefits depend on the type of resin used, but can include heat and weather resistance. Crack-resistant: This is a durable option that works well for walkways.High-strength: Usually sets in 10 to 12 hours.Quick-set: Hardens in 20 to 40 minutes.Here are a few common varieties of concrete: If you’re not sure which type to get, don’t hesitate to talk to a concrete pro near you. There are several kinds of concrete available for different home projects. Once you have your measurement in cubic yards, consult our True Cost Guide for concrete prices. Divide the resulting number by 27 to find the cubic yardage. If you’d rather do the math yourself, simply measure length, width and height in feet. Enter your project area measurements rounded to the nearest foot. Once you find the dimensions of your slab, input them into the calculator along with the thickness. A circular shape requires that you find the diameter. For example, you’ll measure a rectangular shape using length and width. Your measurement methods will shift depending on the shape of your future concrete slab.
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