Concrete Footing Calculator

Summary

Calculate the volume of concrete needed for circular or rectangular footings in cubic yards, cubic feet, and bags.

How it works

1. Select the footing shape — circular or rectangular.
2. Choose your unit system: Imperial (inches and feet) or Metric (centimeters and meters).
3. Enter the footing dimensions: diameter for circular, or length and width for rectangular.
4. Enter the footing depth (thickness of the pour).
5. Optionally enter the number of footings to pour at once.
6. Click Calculate to see total volume in cubic yards, cubic feet and the required number of concrete bags.
7. Add 5–10% extra when ordering to account for waste and spillage.

Use cases

• Estimating concrete for deck post footings.
• Calculating material needed for fence post bases.
• Planning concrete pours for structural column footings.
• Budgeting bag quantities before a DIY foundation project.
• Sizing pier and pad footings for sheds, pergolas and carports.
• Comparing circular vs. rectangular footing material costs.

Frequently Asked Questions