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Concrete Cubic Yards illustration

Construction · Quantity

Concrete Cubic Yards

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Use this to estimate how many cubic yards of concrete a rectangular slab needs from its dimensions in feet.

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Patio slab

(Length * Width * Thickness) / 27

A 20x10 ft slab at 0.33 ft thick needs about 2.44 cubic yards.

Check your inputs before you rely on the result — calculations are informational only and depend entirely on the numbers you enter. See our Terms.

Variables and units

  • Length (ft)

    Slab length in feet.

    count

  • Width (ft)

    Slab width in feet.

    count

  • Thickness (ft)

    Slab thickness in feet (e.g. 0.33 for 4 inches).

    count

Common mistakes

  • Entering thickness in inches instead of feet.
  • Forgetting a waste allowance for the pour.

Step-by-step example

Patio slab

A 20x10 ft slab at 0.33 ft thick needs about 2.44 cubic yards.