Concrete Calculator
Estimate cubic yards for a slab. Add a waste factor and optional price per cubic yard.
Quick guide
- Measure slab length × width and confirm the thickness (inches or cm).
- Use finished (installed) dimensions, not forms that will be trimmed.
- Add a buffer for over-excavation, spillage, and uneven subgrade (often 5–10%).
Concrete Calculator
Estimate cubic yards for a slab. Add a waste factor and optional price per cubic yard.
Units
Results
- Estimated cubic yards
- 1.36
How to measure your slab
- Split complex shapes into rectangles and add their areas.
- Convert thickness to feet (in ÷ 12) or meters (cm ÷ 100) before volume math.
- If edges are thickened or there are footings, estimate those separately.
Assumptions to double-check
- Thickness is average thickness across the whole pour (high/low spots change volume).
- Concrete is ordered by volume (cubic yards/meters); suppliers may have minimums.
- Ordering short can stop a pour—buffers are usually cheaper than a second delivery.
Ordering tips
- Confirm PSI, slump, fiber, and admixtures with your supplier before ordering.
- Plan a little extra for waste and wheelbarrow/pump line loss if applicable.
- Round up to delivery minimums and consider timing so you can place it continuously.
Last updated: Dec 2025
FAQ
Why is concrete measured in cubic yards?
Ready-mix concrete is commonly sold by the cubic yard in the US.
What depth is common for a slab?
Many slabs use 4 inches, but requirements vary by project and load.
Should I add waste?
Yes—10% is common to account for spillage and uneven subgrade.
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Disclaimer
Results are estimates for informational purposes only. Always verify measurements and product specifications.