Concrete Calculator

Calculate how much concrete you need for a slab, footing, pad, driveway, or other rectangular project.

Measurement unit

Concrete dimensions

Enter the length, width, and thickness of the area you want to fill with concrete.

Length

Width

Thickness

Example: 0.10 m = 100 mm.

Waste allowance

A common allowance is around 5–10%.

Length

Enter feet and optional inches.

Width

Enter feet and optional inches.

Thickness

Example: 4 inches = 0 ft 4 in.

Waste allowance

A common allowance is around 5–10%.

Concrete required

Estimated volume including your selected waste allowance.

Recommended concrete volume

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Includes waste allowance

Base volume

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Waste allowance

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Cubic meters

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Cubic feet

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Liters

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Cubic yards

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Calculation breakdown

Length —

Width —

Thickness —

Waste allowance —

Formula —

Base volume —

Recommended volume —

Tip: Concrete quantities are estimates. Add a waste allowance to account for uneven ground, spillage, formwork variations, measurement differences, and other job-site conditions. For large projects, verify the final quantity with your contractor or concrete supplier.