Concrete Slab Calculator
Enter values and click calculate.
Use this concrete slab calculator to estimate concrete required for a slab using length, width, and slab thickness.
What This Calculator Does
This calculator converts slab thickness from millimetres into metres, then calculates concrete volume. It is helpful for driveways, shed slabs, patios, and house slabs.
How to Use
- Enter slab length.
- Enter slab width.
- Enter slab thickness in millimetres.
- Click calculate.
Example
A 7m by 5m slab at 100mm thickness needs 3.5 cubic metres of concrete.
Why This Calculation Matters
Slab jobs are common and often priced quickly. A dedicated slab calculator reduces unit mistakes and helps with ordering and estimating.
Common Mistakes
- Typing thickness in metres instead of millimetres.
- Ignoring step-downs or thickened edges.
- Using rough dimensions from memory.
- Not checking finished slab size.
FAQs
Why is slab thickness in millimetres?
Because slab thickness is commonly measured in millimetres on site and on plans.
Can I use this for a driveway?
Yes. It works well for simple slabs and driveways.
Does this include reinforcement?
No. It only estimates the concrete volume.