Concrete Footing Calculator
Plan footings for foundations, decks, fences, and columns. Get concrete volume, rebar requirements, and total cost estimates.
Frequently Asked Questions
How deep should footings be?
Footings typically go 12 inches below the frost line. In northern regions this is 42–48 inches; in warm climates 12–24 inches may suffice.
How wide should a footing be?
Footing width is usually 2× the wall thickness or minimum 16 inches for residential loads.
Do footings need rebar?
Yes, for most structural footings. Use two #4 rebar horizontally, placed 3 inches from the bottom.
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