How the calculation works
Rectangular volume = section width × section depth × height × count. Round volume = π × radius² × height × count.
A worked example
Two 12 × 12 in rectangular columns at 8 ft high require 16 ft³ before allowance.
What to check before using the result
- Subtract separately modeled voids if present.
- Dimensions and reinforcement must be specified independently of this quantity tool.
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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.