Concrete Column Calculator
Estimate concrete for round or square columns
Round or square
Diameter for round, side for square
Height of the column
Total columns needed
Volume per Column
—
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
Whether you are building porch columns, support pillars, or decorative posts, our calculator helps you estimate the exact amount of concrete needed.
- Determine column shape (round or square)
- Measure diameter or side length
- Enter column height and quantity
- Add 5% extra for spillage
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
Round: V = pi x (D/2)^2 x H
Square: V = S^2 x H
Total = V x Qty / 27
Frequently Asked Questions
How much concrete for a 12" round column?
A 12" diameter column, 8 ft tall, needs about 6.28 cu ft or 0.23 cu yd of concrete, about 4 bags of 80lb concrete.
What size concrete column do I need?
For residential porches, 10-12" round columns are typical. Consult a structural engineer for load-bearing columns.