Calculate concrete for continuous rectangular footings using total length, footing width, depth, and the number of identical runs. The result converts cubic feet to cubic yards and adds a clearly stated waste allowance. This is useful for a preliminary material takeoff, while steps, pads, piers, keyways, and varying footing sizes should be measured as separate shapes.
The result is the volume of identical rectangular footing runs plus your selected allowance.
Calculate stepped sections, enlarged pads, piers, and differing cross-sections separately, then combine the volumes.
Two 120 ft runs, each 24 in wide and 12 in deep, contain 480 ft³ or 17.78 yd³. Adding 5% produces an order estimate of 18.67 yd³.
Usually not. Field variation and handling loss can justify a separate allowance, which this calculator displays explicitly.
Convert every dimension to the unit shown by the field before calculating.
No. The result covers concrete volume unless an input or output explicitly says otherwise.
They often have different dimensions, placement conditions, and waste assumptions.
No. Confirm dimensions, specifications, and order increments with the project documents and supplier.
| Item | How it is used |
|---|---|
| Net footing volume | Calculator input in the displayed unit |
| Allowance volume | Calculator input in the displayed unit |
| Order volume in cubic feet | Calculator input in the displayed unit |