Concrete calculators

Calculate slabs, post holes, footings, walls, columns, bag counts, waste, and an order-ready quantity.

Mixed shapes are totaled before rounding. Do not round each shape and then add the order numbers.

Calculate concrete for rectangular, round, L-shaped, and thickened-edge slabs without hiding waste or rounding.

The thickened-edge row uses a 12 in edge and 8 in of extra depth under a 4 in field. It is not a design recommendation.

See 40, 50, 60, and 80 lb bag counts at the same time, rounded up with waste included.

Yields are 0.30, 0.45, and 0.60 ft³ for the 40, 60, and 80 lb columns. A different product label replaces these yields.

Calculate concrete for fence and deck post holes, including optional post displacement.

Post subtraction uses the diameter you enter. The calculator does not choose embedment or frost depth.

Calculate concrete for round forms by diameter, fill depth, and tube count.

Diameter is the inside of the form. Reinforcement is not subtracted from the purchasing quantity.

Calculate concrete volume for a strip footing using total length, width, and depth.

Order quantity rounds the wasted volume up to 0.25 yd³. Confirm the supplier increment before you buy.

Calculate a concrete wall and subtract repeated rectangular openings when needed.

Opening length and height are in feet. Thickness is in inches. Formwork and reinforcement are not included.

Calculate round or square concrete columns by size, height, and count.

Enter the inside of the form. The calculator does not add formwork, steel, or excavation.

Compare the order quantity, bag workload, and your actual supplier fees in one result.

Weight is bag count times 80 lb. It is a handling figure, not a delivered price.

Estimate material cost from an order-ready quantity, supplier price, delivery fees, pump cost, and tax.

No price in this table is a local quote. Enter supplier figures in Adjust assumptions before comparing invoices.