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Concrete Calculator
Calculate cubic yards of concrete for slabs, footings, and post holes. Get material quantities and estimated costs instantly.
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How to Calculate Concrete
Concrete is measured in cubic yards. To calculate how much you need: multiply length x width x depth (in feet), then divide by 27 (since there are 27 cubic feet in a cubic yard). For cylindrical post holes, use the formula for the volume of a cylinder: pi x radius-squared x depth.
Always add a waste factor (we default to 10%) to account for spillage, uneven ground, and over-excavation. Ready-mix concrete is typically delivered in full-yard increments, so round up.