Concrete Calculator

Whether you are pouring a slab for a shed, setting fence posts, or building a patio, getting the volume right is critical. Concrete hardens quickly and is expensive to waste. Use this tool to calculate exact cubic yards and determine how many premixed bags (60lb or 80lb) you need for your project.

Length

ftin

Width

ftin

Thickness (inches)

Quantity

Waste Factor (%)

Recommended: 5-10% to account for spillage and uneven subgrades

Enter dimensions and click Calculate

Note: These calculations include your specified waste factor to account for uneven subgrades or spillage. For projects requiring more than 1 cubic yard of concrete, it is often more cost-effective to order a truck delivery from a ready-mix supplier rather than mixing bags by hand.