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Concrete Footing Calculator — Round, Square & Rectangular Footings

Editable live calculator

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No hidden assumptions. Inputs, units and the working stay visible so you can check the calculation.

Footing shape Round diameter (in) Pad / strip length (ft) Square mode uses this length as the side dimension.Pad / strip width (in) Used by rectangular / strip mode.Footing depth (in) Number of identical footings Allowance (%) Concrete yield per bag (cu ft) Use the yield from the actual product.Price per bag (optional)

Calculated result

0.576 yd³ concrete

2.3562 cu ft per round pier · 14.137 cu ft raw total

15.551 cu ft after allowance · 26 whole bags at 0.6 cu ft/bag

Bag price is optional.

Show the working

1. π × (0.5 ft)² × 3 ft = 2.3562 cu ft each
2. 2.3562 × 6 = 14.137 cu ft.
3. Apply 10% allowance → 15.551 cu ft = 0.576 yd³.
4. Bags = ceil(15.551 ÷ 0.6) = 26.

Concrete quantity only. Footing dimensions, reinforcement, frost depth and bearing requirements come from the actual structural/site design.

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