Formula to convert 19.5 liters to gallons is to multiply 19.5 by 0.264172 (this is the value for 1 liter to gallon).
Convert 19.5 Liters to Gallons results
19.5 x 0.264172052 = 5.1513550218
19.5 l = 5.15 gal
To conclude the answer for 19.5 liters is five point fifteen gallons