Calculate the exact amount of concrete needed for slabs, footings, columns, walls, and tubes with bag and cost estimates
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Planning a concrete project? Our concrete calculator helps you determine the precise amount of concrete needed for any shape—slabs, footings, columns, walls, or tubes. Get accurate volume estimates in cubic yards or meters, know how many bags you'll need, and see cost projections before you start.
Concrete is measured in cubic yards (US) or cubic meters (metric). The volume depends on the shape of your project. For slabs and footings, it's length × width × depth. For columns and tubes, we use π × radius² × height. Our calculator accounts for waste (typically 10%) and recommends whether to use bags or order ready-mix based on project size.
Volume Calculation Formula
V = L × W × D (slab) or V = π × r² × h (column)Calculate concrete for backyard patios, walkways, and garden paths.
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It depends on the bag size: 80 lb bags yield about 0.6 cubic feet, 60 lb bags about 0.45 cubic feet, and 40 lb bags about 0.3 cubic feet. Our calculator shows all three options. For projects over 1 cubic yard, consider ready-mix delivery.