Quick answer
Calculate each footing type separately. A continuous footing uses length × width × depth, while an isolated pad uses pad length × pad width × pad depth. Add all sections, then convert cubic feet to cubic yards.
Step by step
- List footing types Separate continuous walls, isolated pads and steps.
- Use designed dimensions Do not substitute excavation dimensions for concrete dimensions.
- Calculate each section Multiply length, width and depth in feet.
- Add and convert Total cubic feet ÷ 27 gives cubic yards before ordering rules.
Formula or rule of thumb
Example
A 60 ft strip footing 1.5 ft wide and 0.75 ft deep is 67.5 ft³, or 2.50 yd³.
Common mistakes
Confusing trench size with concrete size, ignoring steps, and estimating reinforcement from volume alone.
Planning note: product yields, installation methods, site conditions and local requirements can change the final quantity. Use the exact manufacturer or supplier information before purchasing.
Decision guide
| Decision point | What the estimate tells you | What to verify |
|---|---|---|
| Measurements | Start with accurate project dimensions and the correct units. | Replace generic assumptions with site measurements. |
| Product data | Use the actual package yield, coverage or density. | Check the current manufacturer or supplier label. |
| Final decision | Treat the result as an early planning estimate. | Confirm final quantities and requirements before purchase. |
Authority and verification
RenoMetric provides transparent planning arithmetic, not a structural design or contractor quote. Verify final decisions with the current product label or supplier data, the applicable local requirements, and a qualified professional when the project is safety-critical.
- RenoMetric methodology — formulas, units and planning limitations.
FAQ
Are footing dimensions universal?
No. Soil, loads, frost depth and local rules control design.
Can I combine pads and strip footings?
Calculate them separately and add the volumes.
Does this design a foundation?
No. It is only a quantity estimate.