Formula and Assumptions
Volume = length x width x thickness. Cubic yards = cubic feet / 27.
Actual conditions, local rates, product labels, and contractor recommendations can change the final quantity or cost.
Example Calculation
A 10 x 8 ft slab at 4 inches thick is about 0.99 cubic yards.
Tips
- Order extra for spillage and uneven base.
- Confirm bag yield by product.
- Large pours are usually ready-mix jobs.
FAQ
Why convert inches to feet?
Thickness in inches must be divided by 12 for cubic feet.
Should I add waste?
Yes, add extra for irregular forms.
Does this include reinforcement?
No, rebar or mesh is separate.
Can I use it for posts?
This version is for rectangular slabs.