Concrete Calculator
Calculate how much concrete you need for your project.
How to Calculate Concrete Volume
For a rectangular slab: Volume = Length × Width × Depth (converted to the same units). To convert cubic feet to cubic yards, divide by 27. A standard 80lb bag of concrete yields about 0.6 cubic feet.
60lb bags yield ~0.45 cubic feet each. Always buy 10% extra to account for spillage and uneven ground.