Concrete Calculator
Calculate concrete volume plus estimated cement, sand and aggregate for slabs, footings and circular columns.
🔎 Calculate concrete volume and estimate material quantities
Enter the dimensions of a slab, footing or circular column to calculate concrete volume before applying your waste allowance.
The calculator can also estimate cement, sand and aggregate for planning and takeoff. Mix design and site requirements should still follow project specifications.
- Concrete volume for common shapes.
- Estimated cement, sand and aggregate.
- Waste allowance and project cost options where available.
Worked examples and practical tips
For a rectangular pour, volume is length multiplied by width multiplied by thickness, all in metres.
Calculate slab concrete
A slab 4 metres long, 3 metres wide, and 0.15 metres thick needs 1.8 cubic metres before any allowance.
Allow for losses
A planning allowance may be added separately depending on site conditions, geometry, and supplier guidance.
Tip: Estimates do not replace structural design, mix specifications, engineering review or on-site quantity checks.
💡 Useful information
Estimate concrete volume in cubic metres for basic slabs and rectangular pours using length, width and thickness. Review worked examples.
- Runs directly in a modern browser.
- Works on phones and desktop computers.
- Reuse it without creating an account.
ℹ️ How to use
- Choose the relevant concrete quantity estimate and enter the dimensions shown in the calculator.
- Use consistent units when entering lengths, widths and thicknesses.
- Calculate the estimate and separately review any wastage allowance and engineering requirements.