What does this tool do?
A footing is a rectangular volume of length × width × depth. This calculator handles strip and pad footings, multiplies by the number of runs and adds a 10% waste allowance for uneven subgrade.
The Formula
Volume (ft³) = Length × Width ÷ 12 × Depth ÷ 12 × Number of footingsFrequently Asked Questions
How do I calculate footing concrete?
Multiply length × width × depth in feet, divide by 27 for cubic yards and add 10% for uneven subgrade.
How deep should a footing be?
Depth depends on the frost line and the load; an engineer or the local building department should specify it.