Formula to convert 21.2 liters to gallons is to multiply 21.2 by 0.264172 (this is the value for 1 liter to gallon).
Convert 21.2 Liters to Gallons results
21.2 x 0.264172052 = 5.60044751088
21.2 l = 5.6 gal
To conclude the answer for 21.2 liters is five point six gallons