Converting the volume of a tank from one measure to gallons requires only two pieces of information: The measurement from which the volume is being converted and a figure by which to multiply it. If, for example, you know the number of litres a tank holds, simple multiplication of the equivalent in gallons of one litre by the volume in litres will yield the volume in gallons. Conversions from cubic meters or pints to gallons require the same process.

Determine the volume in litres of the tank in question.

Multiply the number by 0.264172052.

View the number produced. This is the volume of the tank in gallons.

Determine the volume in cubic meters of the tank in question.

Multiply the number by 264.17205.

View the number produced. This is the volume of the tank in gallons.

Note the volume in pints of the tank in question.

Multiply the number by 0.125.

View the number produced. This is the volume of the tank in gallons.