Concrete
Calculator

Calculate concrete volume for slabs, footings, columns, and stairs with bag quantity and cost estimates.

Shape

Units

Dimensions

V = L × W × D
Include 10% waste factor

Volume

Cubic Yards (yd³)1.23
Cubic Feet (ft³)33.33
Cubic Meters (m³)0.944

Bags Needed

40 lb bags113
60 lb bags73
80 lb bags57

Cost Estimate

Learn more

Why do contractors always order 10% more concrete than the formula says?

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Frequently Asked Questions

Multiply the length by the width by the depth of the area to find the volume in cubic feet or meters. Divide cubic feet by 27 to convert to cubic yards. Add 10 percent to account for waste and spillage.

A 10x10 foot slab at 4 inches thick requires approximately 1.24 cubic yards of concrete. Using 80-pound bags that yield 0.6 cubic feet each, you would need about 56 bags.

Residential driveways are typically 4 inches thick for standard passenger vehicles. For heavier vehicles or commercial use, 5-6 inches is recommended for greater load capacity.

Concrete Calculator - Volume and Bag Estimator | ToolsCanvas