Concrete Calculator
Enter length, width, and thickness on Jenzzy to order the right concrete volume with waste factor.
Inputs
Results
Enter values to see results.
Formula
Volume = Length × Width × Thickness; Yards = ft³ / 27
Convert thickness to feet; add 5–10% waste for spills and uneven subgrade.
Example
- Volume ft³: 12 × 10 × 0.333 = 40
- Cubic yards: 40 / 27 ≈ 1.48= 1.48 yd³
Result: ≈ 1.48 cubic yards (add waste buffer)
Frequently Asked Questions
Bags vs ready-mix?
Bags suit small pads; trucks for larger pours.
Rebar?
Does not change volume—plan supports separately.
Slope?
Average thickness for tapered slabs.