How footing concrete is calculated
Convert footing width and depth from inches to feet, multiply by length and quantity, then divide cubic feet by 27.
Cubic yards = Length × Width(ft) × Depth(ft) × Quantity ÷ 27
Why add waste?
Excavation irregularities, soil conditions and placement loss can increase the amount of concrete actually required.
Structural dimensions
This calculator estimates material volume only. Footing dimensions must be determined from appropriate structural and building requirements.
Frequently asked questions
How many cubic feet are in one cubic yard?
27 cubic feet.
Can I calculate several identical footings?
Yes. Enter the number in the quantity field.
Does this determine footing size?
No. It calculates concrete volume from dimensions you provide.
Using this calculator effectively
The footing calculator estimates concrete volume for rectangular continuous or repeated footings. It converts width and depth from inches to feet and reports the result in cubic yards.
Common uses
- Estimating concrete for strip or rectangular footings.
- Calculating several identical footing runs using a quantity field.
- Adding a waste allowance for excavation and placement variation.
Tips for a better estimate
- Use the designed footing width and depth rather than choosing dimensions from the calculator.
- Measure total footing length carefully, including separate runs where applicable.
- Confirm structural and local code requirements independently before construction.
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