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Using this estimator

This free calculator estimates concrete volume and approximate bag quantities for simple shapes. It is not a supplier or an ordering service.

Read the FAQ for formulas, assumptions and manufacturer references, or the About page for the tool's scope.

Confirm the yield printed on your selected mix. This calculator does not choose safe dimensions, reinforcement or concrete strength. Consult a qualified professional for structural design.

No account is required. The privacy notice explains how calculator entries and website usage information are handled.