Calculator
Concrete Calculator
Slabs, footings, and fence-post holes. Volume from length × width × depth, converted to cubic yards and bag counts.
Volume = length × width × (depth ÷ 12) ÷ 27 cubic yards. Waste is applied after conversion.
- Cubic feet
- 40.0
- Cubic yards
- 1.48
- 80-lb bags
- 74
Requirements vary by jurisdiction and by the specifics of a project. YardPermit publishes educational patterns and labeled estimates — not legal determinations, not construction documents, and not a bid. Verify with your local building department and a licensed contractor before you build.