✓ ACI 318 Cylindrical Pier Volume
Concrete Footing & Sonotube Calculator
Calculate concrete volume and 80lb/60lb bags for cylindrical Sonotube piers, post holes, and deck foundations.
Cylinder Dimensions & Quantity
Footing Concrete Requirement
Total 80-lb Bags 24 Bags 6 Bags / Footing
Cubic Yards (Gross) 0.51 yds³ Ready-Mix Volume
Single Pier Net Volume: 3.14 cu ft
If using 60-lb Bags: 31 Bags (60-lb)
Frequently Asked Questions
How deep should concrete deck footings be dug?
Concrete deck post footings must extend at least 12 inches below the local frost depth (typically 36 to 48 inches in northern zones, 12 to 24 inches in southern zones) to prevent winter frost heaving.
How many bags of concrete for a 12-inch Sonotube 4 feet deep?
A 12-inch diameter cylinder 48 inches (4 feet) deep has a volume of 3.14 cubic feet. With 10% waste, you need approximately 6 bags of 80-pound concrete (or 8 bags of 60-pound concrete) per footing hole.
What diameter Sonotube should I use for a deck?
Standard residential decks typically require 10-inch or 12-inch diameter concrete piers. For multi-story decks, hot tubs, or large cantilevered beams, 14-inch to 18-inch bell-bottom footings may be required by local building code.