Formula to convert 63.9 liters to gallons is to multiply 63.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 63.9 Liters to Gallons results
63.9 x 0.264172052 = 16.88059414836
63.9 l = 16.88 gal
To conclude the answer for 63.9 liters is sixteen point eighty eight gallons