CONCRETE ESTIMATOR
Concrete Slab Calculator
Enter slab length, width and thickness in the main calculator to estimate concrete in cubic yards and bags.
Use the calculator →Quick answer
A 10 × 10 ft slab at 4 inches thick is about 1.23 cubic yards before adding extra material.
Your final order should reflect the actual dimensions, conditions, product yield and any buffer you choose.
How the calculation works
For a rectangular slab, volume is length × width × thickness. Thickness must be converted to feet before calculating cubic feet; divide by 27 to convert cubic feet to cubic yards.
Calculate your actual project
Enter your measurements and see yards plus five bag sizes.
Before you buy
- Measure the actual area and depth.
- Confirm the yield printed on the bag or supplier specification.
- Plan for site variation and spillage.
- For larger pours, compare ready-mix delivery with bagged material and labor.