Concrete Calculator
Estimate the concrete volume required for a slab or other rectangular pour, with an optional extra allowance.
Results
Concrete required
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Use the result as a planning estimate and verify project-specific dimensions and product information before ordering or cutting.
How it works
The calculator multiplies project area by concrete thickness and then applies the selected extra allowance.
volume = area × thickness × (1 + extra %)Worked example
A 10 ft × 10 ft slab that is 4 in thick requires about 1.23 yd³ before adding extra material.
Assumptions
- Dimensions describe a rectangular volume.
Limitations
- This estimates volume only; ready-mix ordering minimums and site losses can increase the quantity ordered.