Formula to convert 21.1 liters to gallons is to multiply 21.1 by 0.264172 (this is the value for 1 liter to gallon).
Convert 21.1 Liters to Gallons results
21.1 x 0.264172052 = 5.57403030564
21.1 l = 5.57 gal
To conclude the answer for 21.1 liters is five point fifty seven gallons