How the calculation works
Volume = total run length × width × depth. Convert both cross-section dimensions to feet.
A worked example
A 40 ft run with an 18 × 12 in section measures 60 ft³, or 2.2222 yd³, before allowance.
What to check before using the result
- Use net lengths so overlapping intersections are not counted twice.
- This calculator does not design the footing or assess bearing capacity.
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References & product information
Method prepared 2026-10-21. See our calculation and editorial methods. Spotted a problem? Tell us about it.