Sonotube Calculator
Estimate concrete for sonotube deck footings
Common: 8", 10", 12"
Height of each sonotube
Total sonotubes needed
Volume per Tube
—
cu ft
Total Volume
—
cu yd
80 lb Bags
—
bags
Estimated Cost
—
USD
How to Use This Calculator
Sonotubes are cardboard forms used for deck and porch footings. Our calculator estimates concrete volume and cost per tube.
- Determine frost line depth in your area
- Choose sonotube diameter based on deck load
- Enter tube height and quantity
- Add 10% extra for form variances
AI Insights
Smart analysis for your project
Smart Estimates
Our AI cross-references material costs, regional pricing, and project complexity for more accurate estimates.
Waste Optimization
AI-calculated waste factors based on project type, not flat percentages. Saves 5-15% on material costs.
Best Practices
Recommendations derived from building codes, contractor data, and thousands of completed projects.
Calculation Formula
Volume per tube = pi x (D/2/12)^2 x H(ft)
Total = (Volume x Qty) / 27
Frequently Asked Questions
What size sonotube do I need for a deck?
8-12" sonotubes are standard for residential decks. For a 12x12 deck with 6 footings, use 12"x48" sonotubes.
How much concrete per sonotube?
A 12"x48" sonotube holds about 3.14 cubic feet or about 5 bags of 80lb concrete. Plan for 6 bags per tube for safety.