The calculation, without hidden assumptions
Footing concrete quantity is geometry, not structural design. Round piers use a cylinder volume while square and rectangular pads use length × width × depth. MAXScanner keeps the shape explicit, multiplies by the number of identical footings, applies only the allowance you enter and converts the final volume to whole bags using the actual bag yield rather than assuming one package size.
How to use this calculator
Choose round, square or rectangular/strip geometry and enter the dimensions that describe the concrete itself.
Enter the number of identical footings and the allowance appropriate to the pour and excavation condition.
Enter the cubic-foot yield printed on the premix bag when you want a bag count; otherwise use cubic feet/cubic yards for a ready-mix quantity check.
Where people use it
- •Deck and fence piers
- •Isolated square or rectangular pads
- •Continuous strip-footing volume planning
Example: six 12 in × 36 in round piers
Each 12 in diameter, 36 in deep cylindrical pier is about 2.356 cubic ft. Six identical piers total about 14.14 cubic ft before the project allowance.
What the result does not assume
- •Footing dimensions, reinforcement, frost depth and bearing requirements are structural/site decisions and are not selected by this calculator.
- •Excavations are rarely perfect geometric solids. Overbreak, forms, embedded posts or reinforcement details can change real concrete consumption.
Frequently asked questions
Can this calculate round deck piers?+
Yes. Choose round and enter the actual concrete diameter, depth and quantity.
How do I model a continuous wall footing?+
Choose rectangular/strip, enter the total footing length, width and depth, and use quantity 1 unless you have several identical strips.
Does the bag count assume a fixed bag size?+
No. Enter the cubic-foot yield printed on the bag or manufacturer data.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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Keep the result connected to the real job
MAXScanner keeps the formula and assumptions beside the result so you can verify the number before using it in a drawing, estimate, specification, worksheet or document. Where a supplier, manufacturer, drawing or applicable standard owns a requirement, that source remains authoritative.