Strip footings carry walls, decks and small structures. Enter the total run length plus the footing width and depth.
How it is calculated
Cubic feet = length (ft) x width (in) / 12 x depth (in) / 12. Divide by 27 for cubic yards.
Worked example
A 40 ft footing that is 16 in wide and 8 in deep needs 40 x 1.33 x 0.67 = 35.6 cubic feet, about 1.32 yards before waste.
Frequently asked questions
What size should a footing be?
Footing size depends on soil, load and local code. Many small residential footings are 16 to 24 in wide and 8 to 12 in deep. Check your local building code.
Do footings need rebar?
Usually yes. Ask your building department.