Concrete Slab Cost Calculator
Calculate concrete slab volume, whole bags, waste allowance and material cost in imperial or metric units.
Concrete Slab Cost Calculator
Estimate concrete volume, whole bags and material cost for a rectangular slab.
Project dimensions
Material options
Your estimate
See calculation details
Planning estimate only. Verify supplier specifications, local conditions and product suitability before ordering.
Volume = length × width × thickness. Allowance is added to the required volume, then bag count is rounded up to a whole bag. Standard bag yields are approximations; check the manufacturer label.
Concrete Slab Cost Calculator FAQs
How do I estimate concrete bags?
Divide the slab volume by the yield per bag, add an allowance for waste, and round up to whole bags. Check the actual yield on your bag label.
Is this a structural design tool?
No. Thickness, reinforcement and foundation requirements must be determined for your project by an appropriately qualified professional.
How MaterialMetrik works
Enter project dimensions in your preferred unit system.
Choose realistic allowances, yields, densities and supplier prices.
See transparent quantities, whole packaging units and costs.
Frequently asked questions
Are prices live supplier prices?
No. All prices are entered by you; the tool does not fetch local prices or currency exchange rates.
Does changing units change the project size?
No. Existing dimensions are converted to equivalent values when switching between imperial and metric.
Are these engineering calculations?
No. These are preliminary material quantity estimates. Structural design, foundations and local code compliance require appropriate professional review.
Can I share an estimate?
Yes. The share button creates a URL containing the calculator's input values. It does not upload your project data.