Formula to convert 21.5 liters to gallons is to multiply 21.5 by 0.264172 (this is the value for 1 liter to gallon).
Convert 21.5 Liters to Gallons results
21.5 x 0.264172052 = 5.6796991266
21.5 l = 5.68 gal
To conclude the answer for 21.5 liters is five point sixty eight gallons