Concrete Footing Calculator
Estimate concrete volume for foundations, piers, and deck posts.
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Constructing Solid Footings
Types of Footings
- Spread Footings (Box): The most common residential footing. Used to support individual columns or piers. They spread the concentrated load over a wider soil area.
- Strip Footings (Wall): Continuous footings that run the entire length of a load-bearing wall. Common in basement foundation construction.
- Pier Footings: Often concrete cylinders (formed with Sonotubes) that extend deep into the ground, usually to support decks or pole barns.
The Frost Line Rule
One of the most critical rules in foundation work is digging below the frost line. In cold climates, the ground freezes and expands (heaves). If your footing is sitting in frozen soil, the entire structure will lift and crack.
By placing the footing below the depth that frost penetrates, you ensure it sits on stable, non-moving ground year-round.
FAQ
How deep should my footings be?
Footings must extend below the frost line to prevent shifting during freeze-thaw cycles. In much of the US, this is between 12 and 48 inches. Check your local building codes.
What is a Spread Footing?
A spread footing is a wider base (usually square or rectangular) that distributes the weight of a column or foundation wall over a larger area of soil.
Do I need rebar in my footings?
Yes, steel reinforcement is highly recommended. Concrete has high compression strength but low tensile strength. Rebar prevents the footing from cracking under uneven loads or soil settling.
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