Formula to convert 19.9 liters to gallons is to multiply 19.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 19.9 Liters to Gallons results
19.9 x 0.264172052 = 5.25702384276
19.9 l = 5.26 gal
To conclude the answer for 19.9 liters is five point twenty six gallons