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Concrete footing calculator
Exact concrete volume for a continuous (strip) footing run, in cubic yards.
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How it’s computed
Volume = footing length (ft) × (width in ÷ 12) × (depth in ÷ 12) ÷ 27, quantized to 0.01 cy.
Decimal-exact and deterministic: identical inputs always return identical results. This is the same math Ask Donnie’s estimating engine runs — not an approximation, and never a language model doing arithmetic.
Common questions
What about pad footings?
This is the continuous-run form. For an isolated pad, compute it as a small slab (length × width × thickness) with the concrete slab calculator, per pad.
What width and depth do I use?
Footing dimensions are structural and code decisions — take them from your plans or engineer. This calculator only turns those dimensions into an exact yard count.
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