Determining How Much Concrete is Needed
We supply ready mix concrete by the cubic yard, the equivalent of 27 cubic feet. Each cubic yard is enough to fill an area 3 feet wide by 3 feet long by 3 feet deep.
To determine how much concrete is needed, begin by determining the surface area – length times width:
24 feet wide x 18 feet long = Surface area of 432 feet
Multiply your surface area by the depth of the pour in feet:
Surface area of 432 feet x depth of .333 feet (4 inches) = Volume of 143.86 cubic feet
Finally, divide the volume in cubic feet by 27 to get your volume in cubic feet:
143.86 cubic feet ÷ 27 = 5.33 cubic yards
Keep in mind, there are many variables that can affect the actual amount of concrete needed, such as the evenness of the surface, pipes and other objects that may take up space, and the amount of waste or spillage during the pour. It’s always advisable to order slightly more concrete than is needed, to compensate for spillage. Should you require more concrete than you order, you may end up paying significantly more for a second delivery of a smaller load to make up the difference.