About Concrete Calculator
Calculate cubic yards and bags of concrete needed for slabs, footings, and post holes.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Volume (Cubic Yards) = [Length (ft) × Width (ft) × (Thickness (in) / 12)] / 27
Example Calculation
A 10ft × 10ft slab at 4 inches thick requires ~1.23 cubic yards or approx 56 sixty-pound bags.
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.