Concrete
Calculate the cubic yards of concrete for a slab from its length, width and depth in inches. It divides depth by 12 to feet, multiplies out the volume, then divides by 27 to convert cubic feet to cubic yards. A 10% waste line is included for spillage and uneven subgrade.
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Worked example
Cubic yards: 1.234568 · +10% waste: 1.358025
Inputs
- Length ft
10 - Width ft
10 - Depth in
4
Frequently asked
Why cubic yards?
Ready-mix concrete is ordered and priced by the cubic yard, which is 27 cubic feet.
Should I add waste?
Yes — the +10% line covers spillage, over-dig and slab thickness variation.