What this calculator does
The Concrete Driveway Cost Calculator estimates how much concrete you need and what it will cost based on the driveway's footprint and slab thickness. It works in feet for length and width, inches for thickness, and prices the concrete by the cubic yard — the standard unit ready-mix suppliers quote. The result gives you the total volume in cubic feet, the concrete required in cubic yards, and the estimated material cost.
How to use it
Enter the length and width of the driveway in feet, the slab thickness in inches (4 inches is typical for residential driveways, 5–6 inches for heavier vehicles), and the price your supplier charges per cubic yard of concrete. Press calculate to see your volume and cost. The estimate covers concrete material only — add allowances for labor, formwork, rebar, gravel base, delivery, and a 5–10% waste margin for a complete budget.
The formula explained
First the area is found as length × width (square feet). The thickness in inches is divided by 12 to convert it to feet, giving the volume in cubic feet. Since concrete is sold by the cubic yard, that volume is divided by 27 (there are 27 cubic feet in a cubic yard). Finally, multiplying the cubic yards by the price per cubic yard gives the total cost.
$$\text{Cost} = \frac{\text{Length} \times \text{Width} \times \frac{\text{Thickness}}{12}}{27} \times \text{Price/yd}^3$$
Worked example
For a driveway 40 ft long, 12 ft wide, and 4 in thick at $160 per cubic yard: area = \(40 \times 12 = 480\) sq ft. Volume = \(480 \times \frac{4}{12} = 160\) cu ft. Cubic yards = \(160 / 27 \approx 5.93\) cu yd. Cost = \(5.93 \times \$160 \approx \$948.15\).
FAQ
How thick should a concrete driveway be? Four inches is standard for cars; use 5–6 inches if trucks or RVs will park on it.
Does this include labor? No — it estimates concrete material cost only. Labor often equals or exceeds the material cost.
Should I order extra? Yes. Order about 5–10% more than the calculated volume to allow for spillage, uneven subgrade, and over-excavation.
