YardCompute / Project Guides / Concrete Driveway Calculation
How to Calculate Concrete for a Driveway
Concrete for a driveway is usually estimated from the driveway length, width, and slab thickness. Once those measurements are expressed in compatible units, you can calculate cubic feet and convert the result to cubic yards for ready-mix ordering.
1. Measure the driveway area
Measure the planned driveway length and width. If the driveway changes width or contains separate rectangular sections, calculate each section separately. Do not rely on an average dimension when the shape can be measured in parts.
2. Convert thickness to feet
If the driveway thickness is given in inches, divide it by 12. For example, 5 inches is 5 ÷ 12 = 0.4167 feet.
3. Calculate concrete volume
For a rectangular section:
Volume in cubic feet = length × width × thickness in feet
Example: a 40 ft × 12 ft driveway at 5 inches thick uses about 40 × 12 × 0.4167 = 200 cubic feet.
4. Convert cubic feet to cubic yards
Ready-mix concrete is commonly ordered by cubic yard. Since one cubic yard contains 27 cubic feet:
200 ÷ 27 = about 7.41 cubic yards
A planning allowance can then be applied if appropriate. For example, 10% would give about 8.15 cubic yards. The supplier should confirm the actual order quantity because site grade, forms, waste, and project details can affect the amount required.
Account for irregular sections
For a wider apron, turnaround, or another rectangular section, calculate its volume separately and add the cubic-foot results before converting to cubic yards. This makes it easier to check each measurement.
Common mistakes
- Multiplying inches directly with measurements in feet.
- Forgetting the 27 cubic-feet-per-cubic-yard conversion.
- Ignoring changes in driveway width.
- Using a thickness that does not match the actual project plan.
- Ordering exactly the mathematical volume without discussing site conditions and supplier requirements.
Use the Concrete Driveway Calculator
For a faster estimate, use the YardCompute Concrete Driveway Calculator. Enter the driveway dimensions and slab thickness to estimate cubic feet and cubic yards with an optional planning allowance.
FAQ
How many cubic yards are in 1,000 cubic feet?
About 37.04 cubic yards, because 1,000 ÷ 27 = 37.04.
Should driveway thickness be measured in inches or feet?
Either is fine, but convert inches to feet before using the length × width × thickness formula when the other dimensions are in feet.
Does this calculate the structural thickness I need?
No. The calculator estimates volume from the thickness you enter. Driveway thickness, reinforcement, base preparation, drainage, joints, and local requirements should be determined for the actual project.