What this calculates
A driveway is a rectangular slab, usually poured thicker than a patio because it carries vehicles. Enter length, width and the thickness from your plans to get the exact volume, then add waste.
For an L-shaped or widened driveway, calculate each rectangular section separately and add the results.
Open the cost section to itemize your own ready-mix price, delivery fee, labor per square foot and reinforcement — nothing is pre-filled with assumed prices.
Formula
Volume = length × width × thickness
Cubic yards = cubic feet ÷ 27
Total cost = material + delivery + labor + extras (all user-entered)
Worked example
40 × 12 ft driveway, 5 in thick
- 1.40 × 12 × 0.417 = 200 cu ft
- 2.200 ÷ 27 = 7.41 cu yd
- 3.Add 10% waste: about 8.15 cu yd to order
Common mistakes
- Using patio thickness for a driveway. Vehicle loads usually call for a thicker slab — follow your plans or local code.
- Forgetting the apron or turn-around areas in the measurement.
- Ignoring the compacted base; a soft subgrade can increase the concrete actually placed.
Frequently asked questions
How many yards of concrete for a two-car driveway?
A 20 × 20 ft area at 4 inches is about 4.94 cubic yards before waste. Larger driveways scale directly with area — measure yours and use the calculator.
How much does a concrete driveway cost?
It depends on size, thickness, and local material and labor prices. Enter your own quotes in the cost section for an itemized estimate instead of relying on averages.