Footing concrete is calculated from the actual footing geometry shown on the project documents. For a continuous rectangular footing, volume = length × width × depth; for repeated isolated footings, calculate one footing and multiply by the count.
For a rectangular continuous footing, concrete volume = footing length × specified width × specified depth. Calculate different footing sizes separately, convert total cubic feet to cubic yards, and add any ordering allowance only after the geometric volume is complete.
Published: September 29, 2026
Last reviewed: September 29, 2026
Published by BuildYard. The guide reflects BuildYard's calculation methodology and editorial standards and does not replace project-specific professional advice.
Use specified footing width and depth rather than wall thickness or excavation width.
Separate stepped footings or different footing sizes into individual quantity lines.
Continuous footing volume = length × width × depth.
Isolated footing volume = one-footing volume × number of identical footings.
Convert all dimensions to feet, total cubic feet, then divide by 27.
Do not combine concrete volume with excavation, reinforcing steel, or formwork quantities.
After geometric volume is known, document any project-specific allowance for placement loss or irregular excavation.
Structural dimensions and concrete requirements come from the project design; the quantity calculation does not size a footing.
Concrete Calculator estimates ready-mix concrete, bag mix, weight, and truck loads for general slabs, pads, walls, and rectangular pours.
Open calculator →FoundationsFoundation Calculator estimates concrete for foundation wall or footing runs for early continuous-foundation material planning.
Open calculator →Calculate concrete for rectangular columns, round piers, and cylindrical form tubes from cross-sectional area, height, and quantity.
Read guide →ConcreteEstimate cast-in-place concrete wall volume from gross wall area, wall thickness, and true openings while keeping footings, pilasters, and waste separate.
Read guide →ConcreteEstimate rebar linear feet from slab dimensions, bar spacing, edge cover, grid direction, lap lengths, stock lengths, and waste.
Read guide →Continuous rectangular footing example. Structural footing dimensions must come from the project design.
| Step | Calculation | Result |
|---|---|---|
| Width | 24÷12 | 2 ft |
| Depth | 12÷12 | 1 ft |
| Volume | 80×2×1 | 160 cu ft |
| Cubic yards | 160÷27 | 5.93 yd³ |
Current manufacturer data, supplier specifications, drawings, field measurements, applicable codes, permit requirements, and qualified professional guidance can take priority over a general-purpose planning estimate.