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Concrete volume calculator
Ready-mix is ordered in cubic yards. Bags are a backup for small pads. Enter slab size and thickness; the tool adds waste and rounds the truck order to the next quarter yard.
Results
Enter values to see results.
How this calculator works
Volume (ft3) = length(ft) x width(ft) x thickness(ft) x (1 + waste). Cubic yards = ft3 / 27. Typical bag yields: 80 lb about 0.60 ft3, 60 lb about 0.45 ft3, 40 lb about 0.30 ft3. Always read the bag in your region.
Not a structural design. Mix, rebar, base prep, and slump come from a contractor or engineer. Running short on a pour is expensive — rounding up is intentional.