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Estimate volume, waste, and bag count for a slab, footing, or path.
Enter your numbers to see the answer.
Concrete calculator guide
Estimate volume, waste, and bag count for a slab, footing, or path. This free online calculator is designed for people who need a quick, transparent estimate rather than a black-box answer. Enter length, width, depth, waste allowance, review the assumptions, and adjust the values to match your project or situation.
Volume = length × width × depth; convert the result to the selected volume unit and apply the waste allowance.
For a useful first estimate, start with the sample values already shown in the calculator, then replace them with your own measurements or figures. Keep all dimensions in compatible units and round up where the result represents a quantity you must buy.
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision.
How it works
Estimate volume, waste, and bag count for a slab, footing, or path. This tool explains the calculation so you can adjust the assumptions to match your situation.
Common questions
Estimate volume, waste, and bag count for a slab, footing, or path. The page shows the result, a breakdown, and the formula used so you can check the calculation.
You will need length, width, depth, waste allowance. The labels and units beside each field show what the calculator expects.
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision. Accuracy depends on the quality of the inputs and the assumptions used by the underlying formula.