Calculate the concrete volume required for isolated, rectangular, or square footings.
How to Use the Footing Calculator
Choose the footing type — for a square footing, width is set equal to length automatically.
Enter length, width, and depth in feet, plus the number of identical footings.
Click "Calculate" to see the concrete volume per footing and in total.
Frequently Asked Questions
Volume per footing (cu.ft) = Length × Width × Depth. For a 5 ft × 5 ft × 1 ft footing, that is 25 cu.ft. Multiply by the number of footings for the total.
A square footing has equal length and width. A rectangular footing has different length and width. "Isolated" describes a single, independent footing under one column (which may itself be square or rectangular) — the volume math is the same either way.
Yes, it's completely free and requires no sign-up.