Concrete Column Calculator
Estimate concrete volume for round or square columns and piers for deck posts, pergolas, and structural supports. For cylindrical forms, use the sonotube calculator, and check the footing sizing guide for sizing basics.
Inputs
Tip: For piers and columns, waste of 5–10% is common. For irregular holes or extra embedment, consider 10–15%.
Results
Concrete volume
0.13 yd³
3.46 ft³ • 0.1 m³
80-lb bags (rough)
5.76
Assumes ~0.6 ft³ yield per 80-lb bag (varies by mix).
Assumptions
- Column volume assumes straight sides with no bell or flared footing.
- Waste factor adds extra volume for spillage and form variation.
- Bag yield is an approximation; check your product label.
Example
A 12 in round column at 4 ft tall with 10% waste is 0.13 yd³ of concrete. Switch to square to estimate pier or post bases.
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