Concrete, Brick & Masonry calculator
Concrete Footing Calculator
Calculate concrete volume for strip or rectangular footings from measured length, width, depth and allowance.
Calculate concrete volume for strip or rectangular footings from measured length, width, depth and allowance. This estimate is most useful when the inputs reflect the job as it will actually be built, fitted or coated. Give particular attention to excavation overbreak. Footing trenches often widen or deepen locally during excavation. Measure representative sections and allow for overbreak instead of relying only on plan dimensions.
What you need to enter
The Concrete Footing Calculator uses the following project information to calculate the result.
- Length
- Width
- Depth / thickness
- Extra allowance (%)
Calculator result
Concrete volume in m³ / yd³
How the Concrete Footing Calculator works
For concrete volume for strip or rectangular footings, the calculator uses shape volume × allowance. The mathematics is only one part of the estimate: getting excavation overbreak right usually matters more to the real-world result than extra decimal places. Unit conversion happens before the calculation.
Concrete Footing Calculator worked example
Concrete Footing Calculator example: a 12 m strip footing 600 mm wide and 250 mm deep has a theoretical volume of 1.80 m³. If excavation overbreak justifies 10% extra, the ordering estimate becomes about 1.98 m³. Use the numerical result as the starting point, then verify excavation overbreak against the material, layout or equipment actually being used.
Important calculation assumptions
For concrete volume for strip or rectangular footings, footing trenches often widen or deepen locally during excavation. Measure representative sections and allow for overbreak instead of relying only on plan dimensions.
Frequently asked questions
Which starting measurements make the Concrete Footing Calculator more reliable?
For concrete volume for strip or rectangular footings, measure the finished pour dimensions, including the real depth. For excavations, check several points because overbreak can increase volume. This keeps the calculation tied to the actual job rather than a generic assumption.
Which details about excavation overbreak should I verify for the Concrete Footing Calculator?
Before relying on the Concrete Footing Calculator, check excavation overbreak. Footing trenches often widen or deepen locally during excavation. Measure representative sections and allow for overbreak instead of relying only on plan dimensions.
Should I order exactly the amount shown by the Concrete Footing Calculator?
For the Concrete Footing Calculator, use the result in context: use the calculated footing volume with an allowance for trench overbreak. Structural footing width/depth must come from the project design rather than the calculator.