Estimate concrete quantities using metric or US customary project dimensions, editable waste, and practical purchase rounding.
Estimate with the Concrete Calculator
Enter project measurements and editable product assumptions. Values stay in your browser.
Concrete Calculator results
How to use the Concrete Calculator
- Select metric or US customary units where available.
- Enter measured project dimensions and product coverage or size information.
- Adjust waste, density, yield, and cost assumptions to match the project.
- Select Calculate and review whole-unit purchase rounding and limitations.
Worked example
Enter the example project dimensions shown in the form, then adjust waste and product coverage to match the supplier specification.
Assumptions
Dimensions are converted to metric base units before formulas are applied. Waste and product specifications remain editable because installation conditions and supplier products vary.
Limitations
- Bag yield, truck capacity, compaction, spillage, subgrade, and formwork must be verified.
- This calculator does not design a concrete mix, certify strength, or recommend structural thickness.
Frequently asked questions
How accurate is the Concrete Calculator?
It uses the displayed dimensions, conversion constants, and editable assumptions. Actual purchases should be checked against product specifications and site measurements.
Does this include labour or delivery?
Only costs explicitly entered into the form are included. Supplier pricing, labour, delivery, tax, and site costs otherwise remain outside the estimate.
Are project details stored?
No. The calculation runs in your browser and the entered project details are not saved.