Browse ready-made footing size pages for common rectangular and round footings. Compare volume, ready-mix totals, and bag estimates, then use the calculator only when your footing dimensions or count need custom changes.
Open the calculator when you need to change footing count, custom dimensions, or waste assumptions beyond the ready-made size pages.
Footing Calculator → All Project Pages → Guides Hub →Use this hub to browse common footing sizes, compare concrete volume quickly, and open ready-made pages that estimate cubic feet, cubic yards, and bag counts for each footing. It is built for fast planning when you want a size-based estimate without starting from scratch.
If you already know the footing dimensions, open the closest matching size page. If you need to adjust dimensions, footing count, or waste allowance, move to the footing calculator for a custom estimate.
Select a common footing size to filter pages instantly.
Find the exact concrete volume and recommended purchase counts for an 18" x 18" x 24" footing: 4.5 cu ft (0.1667 yd³) core volume, plus 10% waste and bag vs ready-mix guidance.
Calculate concrete for an 18" x 18" x 36" square footing: exact 6.75 cu ft (0.25 yd³), planning 7.425 cu ft, plus bag counts for 40-, 60-, and 80-lb mixes.
Calculate how much concrete an 18×18×48 footing requires: 9 cubic feet (0.3333 yd³) nominal, 9.9 cu ft with 10% waste, plus planning bag counts for 40‑, 60‑, and 80‑lb bags.
A footing page gives you a ready-made estimate for a common footing size, while the footing calculator is better when you need to change dimensions, footing count, or waste assumptions.
No. They are planning estimates. Final material needs can change with excavation shape, overdig, soil conditions, and the actual bag yield printed on the concrete mix you buy.
Bagged concrete often makes sense for one or a few smaller footings. As the number of footings and total volume rise, ready-mix may become more practical for labor, consistency, and total time.
The pages are designed for planning. You should still review the final total and add a sensible waste allowance based on excavation variation, spillage, and site conditions before ordering concrete.
Yes. They are useful as quick planning pages for common residential footing sizes, but final footing dimensions and depth still need to match the structural load, soil conditions, frost depth, and local code.
