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To calculate the amount of concrete you need to finish your project, you must first know the project dimensions. For a concrete slab, you need the width and length of the slab, and the thickness. You multiply the width and length to determine the area, then by the thickness to determine the volume.

For a slab that is 6' x 6' x 6", you would multiply 6' by 6' to get an area of 36 square feet. To get the volume of concrete, you convert the thickness from inches to feet by dividing by 12. This gives you 0.5' for the thickness. Then, multiply your surface area by 0.5 to get the volume in cubic feet. In our example, you have a 18 cubic foot slab.

To determine the volume of concrete you need, typically quoted or sold by the cubic yard, you must convert from cubic feet to cubic yards. To do this, divide by 27. Our example would be 18 divided by 27, for a total of 0.667, or 2/3rds of a yard.

There are a number of calculators available on the internet to make the calculations for you. One we like to use is from ConcreteNetwork.com. This will help you determine the volume of concrete you need, whether you purchase our Cart-Away Concrete, or by the bag and rent a mixer.