Concrete Driveway Calculator
Enter your driveway length, width and thickness to get cubic yards of concrete to order for the pour.
Enter your measurements to see what to buy.
How to calculate it
Enter your driveway length, width and thickness to get cubic yards of concrete to order for the pour.
Source: Volume = length × width × thickness; 1 cubic yard = 27 cubic feet. Driveways are typically poured 5–6 in thick for vehicle loads.
A 40×12 ft driveway at 5 in thick: 40 × 12 × (5÷12) = 200 ft³ ÷ 27 = 7.41 yd³. With 10% waste: 8.15 yd³ to order.
Want the full step-by-step walkthrough? Read our How Much Concrete Do I Need for a 10×10 Slab?.
Purchasing & waste guidance
- Driveways carrying cars are usually 5 in; for trucks or RVs use 6 in.
- Add 10% waste for spillage, uneven subgrade and form leakage.
- A driveway pour this size almost always means ready-mix delivery — schedule the truck and crew in advance.
- Include 4–6 in of compacted gravel base, control joints every 10 ft, and rebar or fiber reinforcement.
Assumptions & what’s included
- Driveway is a single rectangular pour with uniform thickness.
- Waste allowance covers spillage, subgrade irregularity and form leakage.
- Price is per cubic yard of ready-mix and optional.
Frequently asked questions
How thick should a concrete driveway be?
5 in is standard for passenger cars. Use 6 in if the driveway will carry trucks, RVs or heavy equipment. Thinner slabs crack under vehicle loads.
How much concrete do I need for a 2-car driveway?
A typical 20×40 ft driveway at 5 in thick needs about 12.3 yd³ before waste, or roughly 13.6 yd³ with a 10% allowance. The calculator gives an exact number for any size.
Do I need rebar in a concrete driveway?
Most residential driveways use #4 rebar on 24-in centers or fiber reinforcement. Control joints every 10 ft help prevent random cracking. Follow local code for your area.
Related guides
Step-by-step project guides that use this calculator.