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Aquarium Volume Calculator

Calculate aquarium volume from a rectangular tank or cylinder dimensions.

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Use internal water dimensions. Rectangular tanks use length × width × height; cylinders use diameter and height. This estimates geometric volume and does not subtract glass, substrate, décor, equipment, or an unfilled water line.

Enter finite positive dimensions no greater than 100,000 in the selected unit. Rectangular tanks need length, width and height; cylinders need diameter and height.

Rectangular: V = L × W × H. Cylinder: V = π × (D ÷ 2)² × H. Results convert cubic metres to litres and US liquid gallons.

Dimensions stay in your browser and are not uploaded or stored.

Enter dimensions and calculate.

A QUICK WALKTHROUGH

How to use this tool

  1. Choose the tank shape and dimension unit.
  2. Enter the internal dimensions, then calculate the geometric water volume.

Geometric volume

Rectangular: V = L × W × H. Cylinder: V = π × (D ÷ 2)² × H. Results convert cubic metres to litres and US liquid gallons. Use internal water dimensions. Rectangular tanks use length × width × height; cylinders use diameter and height. This estimates geometric volume and does not subtract glass, substrate, décor, equipment, or an unfilled water line.

Local calculation

Dimensions stay in your browser and are not uploaded or stored.

GOOD TO KNOW

Common questions

Does this show the exact amount of water in my tank?

No. It calculates geometric volume from the dimensions. It does not subtract glass, objects, or an unfilled water line.

Which units are available?

Enter dimensions in centimetres, inches, or metres. The result includes cubic volume, litres, and US liquid gallons.

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