Concrete Driveway Calculator
Calculate concrete for any driveway. Get cubic yards, bag count and estimated cost. Standard 4-inch or custom depth.
Driveway Dimensions
Estimation Results
How to Calculate Concrete for a Driveway
Calculating the amount of concrete needed for a driveway is essential for budgeting and ordering ready-mix delivery. To calculate accurately, you need to determine the total volume in cubic yards. First, multiply the driveway's length by its width in feet to find the square footage.
Next, multiply that square footage by the thickness of the driveway (converted to feet). A standard residential driveway is typically 4 inches thick (0.33 feet). Because subgrades are rarely perfectly level, always include a 10% waste margin so you do not run short during the pour.
Driveway Calculation Formula
Cubic Yards = (Length × Width × (Thickness in inches ÷ 12)) ÷ 27
Example for a 20ft × 20ft driveway at 4 inches thick: (20 × 20 × (4÷12)) ÷ 27 = 4.93 cubic yards.
Standard Driveway Requirements Guide
| Application | Recommended Thickness | Concrete Strength (PSI) |
|---|---|---|
| Standard Passenger Cars | 4 inches | 4,000 PSI |
| Light Trucks & SUVs | 5 inches | 4,000 PSI |
| Heavy RVs & Equipment | 6 inches | 4,000 - 4,500 PSI |
Frequently Asked Questions
How many yards of concrete for a driveway?
A standard 20 ft by 20 ft two-car driveway poured at 4 inches thick requires approximately 5 cubic yards of concrete (excluding waste factor).
How thick should a concrete driveway be?
A standard residential concrete driveway should be at least 4 inches thick. For heavier vehicles, RVs, or heavy-duty trucks, 5 to 6 inches is recommended.
How much does a concrete driveway cost?
The raw material cost of ready-mix concrete is typically $120 to $160 per cubic yard. The total cost including labor and site preparation usually ranges from $6 to $12 per square foot depending on your location.
How many bags of concrete for a driveway?
Pouring an entire driveway with bags is extremely difficult, as one cubic yard requires forty-five 80lb bags. A typical 20x20 driveway would require over 225 bags. For driveways, ordering ready-mix delivery is highly recommended.