Construction calculator
Concrete Footing Calculator
Estimate concrete volume for footings.
About the concrete footing calculator
The concrete footing calculator estimates concrete volume for continuous or individual footings.
How to use this calculator
- 1
Measure footing
Measure length in feet, width and depth in inches.
- 2
Set quantity
Enter number of footings if calculating multiple.
- 3
Calculate
Volume = length × (width÷12) × (depth÷12) ÷ 27 for cubic yards.
How the calculation works
Volume = length × (width÷12) × (depth÷12) ÷ 27 for cubic yards per footing. Total = volume × quantity.
Example: 20 ft × 12×12 in footing: 0.74 yd³. 4 footings: 2.96 yd³.
Why use construction calculators?
Construction projects involve significant material costs. Overestimating wastes money; underestimating causes delays. These calculators use standard industry formulas to give you reliable estimates for concrete, lumber, drywall, paint, roofing, flooring, and more. Always add 5–15% waste allowance for cuts, mistakes, and irregularities.
How to get accurate results
Measure twice, calculate once. Use a tape measure for dimensions, and enter values in the units shown. For irregular shapes, break the area into rectangles and calculate each separately. When in doubt, round up — it's better to have a little extra material than to run short mid-project.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about concrete footing calculator
How accurate is the concrete footing calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.