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Water Tank Calculator

Calculate the capacity of a rectangular or cylindrical water tank from its internal dimensions.

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Tank capacity

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Tank capacity

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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 Water Tank 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

For a rectangular tank, length times width times height gives volume. For a cylinder, pi times radius squared times height is used.

Assumptions and limitations

The estimate assumes the dimensions describe usable internal space and the tank is filled to its top. It excludes fittings, freeboard and wall thickness.

Frequently asked questions

How does this calculation work?

For a rectangular tank, length times width times height gives volume. For a cylinder, pi times radius squared times height is used.

What should I keep in mind?

The estimate assumes the dimensions describe usable internal space and the tank is filled to its top. It excludes fittings, freeboard and wall thickness.

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