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Concrete Calculator

Estimate concrete volume and the number of ready-mix bags for a rectangular slab, footing or post base.

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Estimated volume

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Estimated volume

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Concrete bags required

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Planning estimates only. Actual quantities and system requirements depend on product specifications, site conditions, local climate and building codes. Confirm measurements and consult a qualified professional before purchasing materials or sizing equipment.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Concrete Calculator

  1. 1 Choose measurement units and enter the requested dimensions or values.
  2. 2 Review the quantity or capacity and check the assumptions before ordering materials or selecting equipment.

How the calculation works

Length times width times depth gives the volume. The selected waste allowance is added, then the result is divided by the litres of concrete yielded per bag.

Assumptions and limitations

The estimate assumes a regular shape and consistent depth. Ground conditions, reinforcement, spillage and the mix instructions can affect the order quantity.

Frequently asked questions

How does this calculation work?

Length times width times depth gives the volume. The selected waste allowance is added, then the result is divided by the litres of concrete yielded per bag.

What should I keep in mind?

The estimate assumes a regular shape and consistent depth. Ground conditions, reinforcement, spillage and the mix instructions can affect the order quantity.

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