Concrete Footing Calculator
Calculate Concrete Footing
Estimate concrete for continuous or pier footings
Formula
Continuous: Cu Yd = Length (ft) x Width (in)/12 x Depth (in)/12 / 27; Pier: Cu Yd = π x (Diameter/24)² x Depth (in)/12 / 27 x Qty
Frequently Asked Questions
How deep should a concrete footing be?
Footings must extend below the frost line, which varies by region (12-48 inches). Standard residential footings are typically 12 inches deep and 16-20 inches wide, or twice the width of the wall they support.
How wide should a footing be?
A footing should be at least twice the width of the wall it supports. For a standard 8-inch block wall, the footing should be at least 16 inches wide. Check local codes for specific requirements.
How many bags of concrete do I need for a footing?
An 80-lb bag of concrete yields about 0.6 cubic feet. A 10-foot continuous footing that is 16" wide and 12" deep requires about 13 cubic feet, or about 22 bags of 80-lb concrete mix.
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