Concrete Volume Calculator
Get cubic feet, yards, and meters for slabs, walls, footings, and round forms. Free in the browser; take the native iPhone app when you need volume math on the pour.
Concrete volume
Net volume plus waste for ordering ready-mix or comparing to bags.
Total required
- Net volume
- Cubic yards
- Cubic meters
- Waste volume
App screenshots
Real Concrete Volume Calculator screens from the App Store listing.
How to use this calculator
- Choose the pour shape closest to your formwork.
- Use thickness units separately when depth is in inches and length is in feet.
- Add waste percent for overage before ordering ready-mix or bags.
Features
- Multiple pour shapes
- Waste volume planning
- Cubic feet / yards / meters
- Thickness unit flexibility
- Offline iPhone workflow
Formula
Rectangular shapes: L × W × thickness. Round: πr² × depth. Waste volume = net × waste%.
12 ft × 20 ft × 5 in slab, 5% waste
Net ≈ 100 ft³ (≈ 3.70 yd³). With 5% waste, total required ≈ 105 ft³.
Practical notes
- Ready-mix is often quoted in cubic yards — use the yards output when calling the plant.
Take it to the job site
Use Concrete Volume Calculator on your iPhone for fast repeat calculations and the full native workflow — wherever you're working.
Related calculators
Related guides
- How Many Bags of Concrete Do I Need? — Estimate bag count from pour volume and bag yield.
- Concrete Bags for Post Holes — Estimate bags for round post-hole footings.
- Concrete Slab Volume Basics — Cubic feet and yards for rectangular slabs.
FAQ
Can thickness be in inches while length is in feet?
Yes. Pick a thickness unit independent of length/width units in the wall and slab modes.
Form deflection, subgrade settlement, and pump line priming are not included.