Concrete Calculator — How Much Concrete Do I Need?
The Concrete Calculator estimates how many cubic metres of concrete you need for a rectangular slab or footing. Ordering the right amount prevents costly over-ordering and project delays from running short. The calculator adds a recommended 10% extra to account for spillage and uneven ground.
How to Use This Calculator
- 1
Enter the length of the area in metres.
- 2
Enter the width in metres.
- 3
Enter the required depth or thickness (e.g. 0.1 m = 10 cm for a typical driveway slab).
- 4
Click Calculate to see the cubic metres of concrete needed including 10% extra.
Frequently Asked Questions
Volume = Length × Width × Depth. For example, a 5m × 3m slab at 10 cm (0.1 m) deep = 5 × 3 × 0.1 = 1.5 m³ (1.65 m³ with 10% extra).