Concrete volume calculator
Estimate slab area, concrete volume, waste allowance, and approximate cost using length, width, depth, and a rate per cubic metre.
Estimate concrete volume and approximate supply cost.
Enter slab length, width, and depth, then apply waste and a concrete rate to build a quick planning figure.
Results
This tool is for guidance only. Final concrete quantities vary with levels, formation, overbreak, mix specification, reinforcement, pumping, and project-specific conditions.
Useful for quick slab and footing planning checks.
- Sense-check slab and pad quantities before ordering concrete.
- Compare volume and cost with different depths and waste allowances.
- Build a fast planning figure for early budgeting and supply review.
- Export a branded summary for internal reference or client discussion.
This is a planning tool, not a setting-out or structural check.
Concrete quantities still depend on formation levels, thickness changes, edge thickening, reinforcement, pumping, mix design, and supplier terms. Use the calculator as a first pass before ordering from live project information.
Useful next calculators and estimating pages.
Screed Calculator
Useful if the next check is floor screed quantity rather than structural concrete volume.
Open Screed CalculatorRender Calculator
Useful if you also need to estimate applied material volumes on wall surfaces.
Open Render CalculatorConstruction Calculators Hub
Browse the full calculator section if you want to compare all available tools in one place.
View CalculatorsQuick answers about the concrete volume calculator.
What does the concrete volume calculator estimate?
The calculator estimates slab area, concrete volume, waste allowance, and approximate cost based on length, width, depth, and a rate per cubic metre.
Is the concrete depth entered in millimetres?
Yes. The depth field is entered in millimetres and converted automatically into volume within the calculator.
Why add a waste allowance to concrete?
A waste allowance helps account for spillage, uneven formation, overbreak, variation in levels, and ordering tolerance.
Is this suitable for structural design or ordering sign-off?
No. It is intended for quick planning only. Final concrete quantities should always be checked against live drawings, levels, specification, and the supply route.
Need a formal estimate beyond a quick concrete quantity check?
Use the calculator as a starting point, then get in touch if you need project-specific estimating support, take-off, or quantity review on live construction work.