Concrete Footing Calculator
Estimate rectangular concrete footing volume.
Calculation example
Inputs: Length: 20 ft, Width: 1 ft, Depth: 0.5 ft
Result: 10 cubic units
A 20 by 1 by 0.5 unit footing has a volume of 10 cubic units.
Formula
Footing volume = length × width × depth.
How to use this calculator
Multiply length, width and depth using the same unit for all dimensions.
Before you calculate
Measure the project dimensions as accurately as practical and keep all measurements in compatible units. For material products, use the coverage, yield, density, or package size stated by the manufacturer or supplier rather than a generic assumption.
Choose the waste allowance based on the project shape, installation method, cutting requirements, and material characteristics. A simple rectangular estimate may need adjustment for openings, corners, slopes, joints, patterns, compaction, or other site conditions.
Understanding the result
The calculator provides a planning estimate based on the inputs shown above. It is not a substitute for project drawings, structural design, manufacturer instructions, or local requirements. Before ordering, compare the calculated quantity with the supplier's package sizes and ordering units.
Tips
- Use the planned footing dimensions from the project design.
- Add allowances only when appropriate to the project.
Frequently asked questions
How is footing volume calculated?
Length, width and depth are multiplied.
Does this design a footing?
No. It only estimates rectangular concrete volume.
Related calculators
Use compatible units and verify estimates against project specifications, local requirements and manufacturer instructions.