Sonotube Calculator
Calculate how many bags of concrete you need for Sonotube piers and columns. Enter tube diameter, height, and quantity for accurate concrete volume estimates.
Sonotube Concrete
Volume per Tube2.182 cu ft
Total Concrete (1 tubes)0.081 cu yd
With 5% Waste0.085 cu yd
80 lb Bags Needed4
Dry Weight327 lbs (0.16 tons)
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Frequently Asked Questions
How many bags for a 10" sonotube?
A 10" diameter × 48" tall sonotube requires 2.4 cu ft of concrete = 4 bags of 80 lb mix (0.6 cu ft per bag).
How deep should a sonotube be?
Minimum 48" deep below grade for frost protection in most climates. Check local building codes for exact depth.
Do I need rebar in sonotubes?
Yes. Use #4 rebar vertically (2-4 bars per tube depending on load) and a J-bolt at the top for anchoring.