Concrete Column Calculator

Summary

Estimate the concrete volume and bag count needed to pour a circular or square column.

How it works

1. Select the column shape — circular or square.
2. Choose your preferred unit system: Imperial (inches) or Metric (centimeters).
3. Enter the column diameter (or side length for square) and column height.
4. Optionally enter the number of columns to pour at once.
5. Click Calculate to see total volume and the number of concrete bags required.
6. Add 5–10% extra when ordering to account for waste and spillage.

Use cases

• Estimating concrete for porch or deck support columns.
• Calculating material for fence post columns set in concrete forms.
• Planning concrete pours for structural building columns.
• Comparing circular vs. square column material costs.
• Budgeting bag quantities before a DIY column project.
• Quickly estimating multiple columns on a single project.

Frequently Asked Questions