Government of Canada, Department of Justice
Canadian SI, yard, foot, inch, area and volume unit definitions
Version: current-to-2026-06-14CanadaR.S.C., 1985, c. W-6; page current to 2026-06-14Source-backedLast reviewed: 2026-08-01
Arithmetic resultCanada-wide arithmetic
Concrete Quantity Calculator
Estimate concrete volume, waste allowance and optional bag count for simple slabs, rectangular footings and stairs.
Free tool — no sign-up needed. Your numbers stay on this device until you export or share them.
My plan
My renovation plan · Toronto, Ontario
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01 · Project measurements
Adjust the inputs and the result updates immediately.
Example numbers — replace them with your room.
Technical assumptions
Result updated: Order volume, 2.49 m³
02 · Planning result
Source-backed methodOrder volume
2.49 m³
Net concrete
2.27 m³
exact size, no waste added
Waste allowance
0.23 m³
Optional bag count
178
More actions
Private web sharing: Available after secure cloud save is released
Assumptions
These are part of the result, not fine print.
- The measured shape is treated as a simple solid without voids or grade variation.
- Editable waste allowance: 10%
- Entered mixed yield per bag: 0.014 m³
What this result does not decide
- Confirm field measurements, excavation conditions and delivery minimums before ordering.
- Bag count uses the entered mixed yield; verify the exact product label.
Planning information only. This is not a quote, code-compliance decision, structural recommendation, or substitute for site review.
How we calculate this
Official source
Orion Project Studio
Geometry-only material quantity calculation contract
Version: 1.0.0Canada1.0.0Source-backedLast reviewed: 2026-08-01
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