Formula to convert 21.3 liters to gallons is to multiply 21.3 by 0.264172 (this is the value for 1 liter to gallon).
Convert 21.3 Liters to Gallons results
21.3 x 0.264172052 = 5.62686471612
21.3 l = 5.63 gal
To conclude the answer for 21.3 liters is five point sixty three gallons