Concrete Footing Calculator
Concrete volume for strip or column footings.
Enter your values
ⓘ Live results
Results
- Concrete needed
- 2.44 cu yd
- Volume (no waste)
- 2.22 cu yd
- Cubic feet
- 60 cu ft
- 80 lb bags equivalent
- 110
Quick answer
Footing volume is length times width times depth, converted to cubic yards with a waste allowance.
yd3 = (L x W x D) / 27 x (1 + waste%)
How to use the Concrete Footing Calculator
- 1Measure the footing length, width and depth in feet.
- 2Convert cubic feet to cubic yards, the unit ready-mix is sold in.
- 3Add 10% waste for uneven trench sides and spillage.
Worked example
Using the values the calculator loads with:
Inputs
- Footing length40 ft
- Footing width1.5 ft
- Footing depth1 ft
- Waste allowance10 %
Results
- Concrete needed2.44 cu yd
- Volume (no waste)2.22 cu yd
- Cubic feet60 cu ft
- 80 lb bags equivalent110
Frequently asked questions
How deep should footings be?
Deep enough to reach below the local frost line — check your building department.
Can I use bagged concrete for footings?
Yes for small footings, but ready-mix is far more economical above about 1-2 cubic yards.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.