Slabs · Footings · Columns · Cylinders
Foundation sizing, reinforcement requirements, and material specifications
Multiply the slab length by width by thickness to get the volume in cubic feet, then divide by 27 to convert to cubic yards. This calculator handles slabs, footings, and columns with automatic unit conversions.
This calculator supports rectangular slabs, spread footings, and cylindrical columns. Each shape has dedicated input fields for dimensions and computes volume in both cubic feet and cubic yards.
The calculator converts total volume to cubic feet and divides by the yield per bag. Standard 80 lb bags yield approximately 0.6 cubic feet of mixed concrete.
A waste factor of 5–10% is typically added to account for spillage, over-excavation, and form irregularities. This calculator allows you to include a waste percentage in the total estimate.