Home / Cylindrical Water Tank Volume Calculator

Cylindrical Water Tank Volume Calculator

Calculate the capacity of a cylindrical water tank from its internal radius and usable water height.

How to use this calculator

  1. Enter internal radius and the usable height in metres.
  2. Confirm that all inputs use the stated units and the same population, period or scope.
  3. Change one assumption at a time when comparing scenarios.

Formula used by the water tank volume calculator

V = πr²h

  • V = πr²h
  • Actual usable capacity can be lower due to freeboard, fittings, tank shape and outlet limits.
  • Inputs are validated against required ranges and outputs are rounded for readability.

Worked examples

Worked example

Radius 0.75 m and water height 1.5 m.

The geometric capacity is about 2,651 litres.

The geometric capacity is about 2,651 litres.

Understanding the result

Calculate the capacity of a cylindrical water tank from its internal radius and usable water height.

Actual usable capacity can be lower due to freeboard, fittings, tank shape and outlet limits.

Important notes

Actual usable capacity can be lower due to freeboard, fittings, tank shape and outlet limits.

Use the result as a calculation aid for the inputs supplied; confirm critical specifications independently.

Frequently asked questions

Is radius half the diameter?

Yes; if you know diameter, divide it by two before entering it as radius.

Does this include reserve space?

Only if you reduce the entered usable height to account for it.

How do I use this calculator?

Enter internal radius and the usable height in metres.

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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.

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