Formula to convert 16.5 liters to gallons is to multiply 16.5 by 0.264172 (this is the value for 1 liter to gallon).
Convert 16.5 Liters to Gallons results
16.5 x 0.264172052 = 4.3588388646
16.5 l = 4.36 gal
To conclude the answer for 16.5 liters is four point thirty six gallons