Add a transparent allowance and supplier rounding to a known concrete footing takeoff. Enter the net footing volume, expected over-excavation or placement loss, and the order increment. The result separates calculated waste from commercial rounding and shows the total excess above the geometric takeoff, making later reconciliation with delivery tickets easier.
The rounded order is the smallest permitted increment that covers net volume and the chosen allowance.
Footing over-excavation can vary sharply with soil and forming method; replace the default with project-specific experience.
For 18.6 yd³ net with 8% waste, the allowance is 1.488 yd³ and adjusted volume is 20.088 yd³. In 0.25 yd³ increments, order 20.25 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 |
|---|---|
| Allowance volume | Calculator input in the displayed unit |
| Adjusted volume | Calculator input in the displayed unit |
| Rounding addition | Calculator input in the displayed unit |