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
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.