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Concrete Slab Volume from Length, Width, and Depth Calculator

Cubic yards of concrete needed for a flat slab.

Calculates concrete volume for a rectangular slab: yd³ = L(ft) × W(ft) × D(in) / 324, or m³ = L × W × D (metric). Also estimates 80-lb bags needed.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

ft
ft
in

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

yd³ = L × W × D(in) / 324

In depth

Calculates concrete volume for a rectangular slab: yd³ = L(ft) × W(ft) × D(in) / 324, or m³ = L × W × D (metric). Also estimates 80-lb bags needed.