For calculating the amount of water you have in your tank.

This must be known before adding water treatments, fish remedies etc.

For Litres: Length x Width x Depth in centimetres.

Then divide by 1000.

eg: 180 x 43 x 54 cm = 417960

Divide by 1000 = 417.96 litres

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Or for Gallons: Length x Width x Depth in inches.

Then divide by 276

eg: 72 x 18 x 24 inches = 31104

Divide by 276 = 113 gallons.