Formula to convert 21.6 liters to gallons is to multiply 21.6 by 0.264172 (this is the value for 1 liter to gallon).
Convert 21.6 Liters to Gallons results
21.6 x 0.264172052 = 5.70611633184
21.6 l = 5.71 gal
To conclude the answer for 21.6 liters is five point seventy one gallons