Concrete Cubic Feet Calculator for Driveways

Concrete Cubic Feet Calculator for Driveways

Calculate the cubic feet of concrete needed for driveways, patios, sidewalks, and slabs. Concrete sells by the cubic yard (27 ft³).

Formula

Volume (ft³) = Length (ft) × Width (ft) × Thickness (ft)

Convert thickness from inches to feet by dividing by 12.

Standard Concrete Thicknesses

Project	Minimum Thickness	Recommended
Sidewalk	3.5”	4”
Patio	3.5”	4”
Driveway (cars)	4”	5”–6”
Driveway (trucks)	5”	6”–8”
Garage floor	4”	6”
Footing	8”	12”

Driveway Example

A driveway measures 40 ft long × 12 ft wide × 5 inches thick.

• Length = 40 ft
• Width = 12 ft
• Thickness = 5 ÷ 12 = 0.417 ft
• Volume = 40 × 12 × 0.417 = 200 ft³
• Convert: 200 ÷ 27 = 7.41 cubic yards

Concrete Per Bag

A standard 80-lb bag of concrete mix yields about 0.6 ft³ when mixed. For 200 ft³, you need 200 ÷ 0.6 = 334 bags. At that volume, order a ready-mix truck instead.

Cost Estimate

Ready-mix concrete costs $125–$175 per cubic yard delivered. A 7.41 cubic yard driveway costs approximately $926–$1,297 for material only.

Add 10% extra for waste, spillage, and uneven surfaces. Round up to 8.2 cubic yards for the order.

Use our Cubic Feet Calculator to get precise volumes for your concrete project.