Calculating Concrete Yardage
When you are planning to lay concrete for almost any project, you will need to calculate concrete yardage to purchase the correct amount of material for the project. This is usually a fairly straightforward math calculation.
Measure the Area
Whether you are using the concrete to lay a slab foundation or for a driveway, you will need to measure the location where you plan to lay the concrete
Measure the length and width of the area. You will also need to decide on the desired depth of the slab. Multiply the length by the width by the depth (LxWxD). This will give you the area in cubic feet, which is the standard measurement for purchasing concrete.
Divide the cubic foot measurement by 27. This will give you the volume of cubic yards of concrete that you will need for your project.
Finally, multiply the volume cubic yards by 1.05. This will provide you with 105 percent of the concrete you will need. You should always order more concrete than needed to allow for spillage, waste or any unforeseen events.
If you are planning on mixing your own concrete, you will need to purchase enough concrete for the project, plus you will need to rent a portable concrete mixer and equipment to transport the concrete from the mixer to the slab site.
If you order concrete already mixed from a local concrete supplier, they will usually deliver it and pour it directly to the prepared slab site.