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
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
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.