Concrete & construction
Concrete Volume Calculator
Volume of concrete for a slab, a footing, a column or a set of steps, in cubic yards and cubic feet.
Result
Concrete is ordered by the cubic yard and delivered in fixed increments, so the figure you order is always rounded up. Most crews add 5% to 10% for spillage, uneven subgrade and over-excavation; running short mid-pour is far more expensive than a little waste. A 60 lb bag yields roughly 0.45 cubic feet, so bag counts rise very quickly with volume.
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About this calculator
When is bagged concrete sensible?
Under about half a cubic yard. Beyond that the number of bags, the mixing time and the risk of cold joints between batches all argue for a truck.
Does the shape really change the order much?
Round footings catch people out, because area goes with the square of the radius. Doubling a column diameter quadruples the concrete.
The formula
slab = L x W x depth/12; round = pi x r^2 x height; yards = cubic feet / 27
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