basic

Concrete Volume in Cubic Yards for a Slab Calculator

cubic_yards = (L · W · D_in/12) / 27 + waste padding.

Compute the cubic yards of concrete needed to pour a rectangular slab from length, width, and thickness. (L_ft · W_ft · D_in/12) gives cubic feet; ÷ 27 → cubic yards. Add a 5–10 % waste pad. Reports raw and padded volume in yd³ and m³.

Marcus Laurent By Marcus Laurent
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 / 12) / 27 · (1 + waste/100).

In depth

Compute the cubic yards of concrete needed to pour a rectangular slab from length, width, and thickness. (L_ft · W_ft · D_in/12) gives cubic feet; ÷ 27 → cubic yards. Add a 5–10 % waste pad. Reports raw and padded volume in yd³ and m³.