Home & build · NUMORA
Concrete Calculator
Slab or footing, waste, m³ and bags.
Open interactive calculatorHow to use
Default 50kg bag ≈ 0.02 m³ (indicative).
Formula
V = LWH × (1+waste)
FAQ
Is this Concrete calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Default 50kg bag ≈ 0.02 m³ (indicative).
Related calculators
- Square Footage calculatorRectangles, multi-room totals, m² and ft².
- Flooring calculatorArea plus waste factor, then boxes.
- Cubic Meters calculatorShipping volume: L×W×H → m³.
- Cubic Feet calculatorVolume from feet and/or inches.
- Cubic Yards calculatorConcrete and soil staple unit.
- Gravel calculatorArea × depth → tonnes by density.
- Mulch calculatorGarden cover depth and bags.
- Asphalt calculatorPavement area × depth × density.