When to use this calculator
Estimate wet concrete quantity for a uniform rectangular strip footing. A quantity estimate, not a foundation design. Excavation irregularity can increase actual volume.
Explore the material quantities calculators for other questions in this topic. For a related calculation, use the Concrete Stair Volume Calculator: Calculate solid concrete volume for a simple repeated step profile.
PUTTING IT INTO PRACTICE
Concrete Footing: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Footing length (m) | 20 |
| Width (m) | 0.5 |
| Depth (m) | 0.3 |
| Result | 3 m³ |
- Check the input labels and enter the example values above.
- Apply the relationship: Volume = footing length × width × depth.
- The result is 3 m³, rounded for display.
How to interpret your result
A quantity estimate, not a foundation design. Excavation irregularity can increase actual volume.
Calculate net geometric quantities first, then apply a project-specific allowance where appropriate. Coverage per bag or pack should come from the product label. Bulk density, trimming and compaction can substantially change order quantities.
Frequently asked questions
Does a geometric estimate include waste automatically?
Only when a waste or allowance input is provided. Otherwise add an appropriate allowance separately before ordering.
When is the concrete footing calculator useful?
Estimate wet concrete quantity for a uniform rectangular strip footing. A quantity estimate, not a foundation design. Excavation irregularity can increase actual volume.
How do I use the concrete footing calculator?
Enter footing length (m), width (m), depth (m). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Volume = footing length × width × depth.
What should I check before using the result?
A quantity estimate, not a foundation design. Excavation irregularity can increase actual volume.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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