How much concrete do I need?
Slab, round column or square column: enter the size and get the cubic yards to order, checked in 3D.
Result
Exact volume + 10% waste, rounded up to the ¼ yd³ trucks sell in — spillage and an uneven grade never read the plans.
Buying bagged mix instead?
≈ 67 bags (80 lb). For ready-mix from a truck, order the 1.75 yd³ above.
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How is this calculated?
Using the tool
Slab, round column, or square column — pick the shape, enter the size, and get the cubic yards to order, checked in 3D. (Buying bags? That estimate is one tap away.)
The math
A slab is length × width × thickness. A round column is a cylinder: π × (diameter ÷ 2)² × height. A square columnis width × depth × height. Columns multiply by how many you're pouring. Cubic feet ÷ 27 gives cubic yards.
The bag count divides total cubic feet by 0.60 ft³ — the yield of an 80 lb bag — and rounds up. Add 5–10% waste, and over-order slightly rather than stop a pour short.