CONSTRUCTION PROJECT CALCULATOR
Concrete Calculator
Estimate concrete volume for slabs, footings, and post holes, then turn it into a ready-mix order, a bag count, or both.
Build your estimate
HOW IT WORKS
A concrete order you can check.
TapeToCart separates the volume you measured, the extra you allowed, and the supplier or bag rounding, so you can see where the final quantity comes from.
How the calculation works
Rectangular pours are length × width × thickness. Round holes and columns use the area of a circle multiplied by depth and quantity. All volumes are added before the extra-concrete allowance is applied.
Round volume = π × (diameter ÷ 2)² × depth
27 ft³ = 1 yd³
Ready-mix is rounded up to your supplier’s order increment, and bags are always rounded up to whole bags.
Before you order
Ask your ready-mix supplier about minimum order size, short-load fees, and delivery access. Very small pours are often cheaper in bags.
Use the yield printed on the exact bag you are buying. Different mixes and bag weights yield different volumes.
Check local code and your project plans for required thickness, reinforcement, and base preparation. Structural work should be specified by a qualified professional.
Sources and assumptions
Volume uses U.S. customary units: 1 yd = 3 ft, 1 ft = 12 in, and 1 yd³ = 27 ft³.
Bag yield is taken from the product value you enter. We do not assume a standard bag size.
Rebar, mesh, forms, and gravel base are not included in this estimate.