Formula to convert 21.9 liters to gallons is to multiply 21.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 21.9 Liters to Gallons results
21.9 x 0.264172052 = 5.78536794756
21.9 l = 5.79 gal
To conclude the answer for 21.9 liters is five point seventy nine gallons