Calculate concrete cubic yards for a continuous footing from total length, footing width, depth and extra allowance. Use it for early foundation material planning.
Enter your measurements and material details.
Footing dimensions are structural decisions; this calculator only converts known dimensions into volume.
Continuous footing volume is calculated as total footing length multiplied by width and depth, with inch dimensions converted to feet. The result is converted from cubic feet to cubic yards.
Use the total centerline or actual formed length appropriate to your plan. Enter the designed width and depth rather than excavation size if forms define the finished footing.
No. It only calculates concrete volume from dimensions you provide.
Use the finished concrete width; that may be the trench width for earth-formed footings.
Calculate each step segment separately and add the volumes.
Yes when excavation or forms may vary from nominal dimensions.
No. Wall concrete should be calculated separately.
Using the example inputs shown in the calculator — Total footing length (ft) = 80, Footing width (in) = 20, Footing depth (in) = 10, Extra allowance (%) = 10 — the result is 4.53 cubic yards. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Raw volume: 4.12 yd³; Cubic feet: 122.2 ft³. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this concrete footing calculator, the inputs with the greatest practical effect are total footing length, footing width and footing depth. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Concrete Footing Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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