Concrete Calculator
Estimate the cubic metres of concrete required for a rectangular area such as a small slab or path.
Estimated result—
How it works
Volume = length × width × depth in metres. Millimetres are divided by 1000 to convert depth to metres.
Example
A 5 m × 3 m slab at 100 mm thick is 1.50 m³, or about 1.65 m³ with a 10% allowance.
Useful things to know
- Real pours can require extra for uneven ground, spillage and formwork variation.
- Complex shapes should be split into simpler sections and added together.
- Confirm structural thickness and reinforcement requirements with the appropriate professional.
About this estimate
HandyNumbers calculations run in your browser. Results are general estimates and can differ from real-world outcomes because of fees, taxes, tariffs, product specifications, rounding and individual circumstances.