Formula to convert 39.9 liters to gallons is to multiply 39.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 39.9 Liters to Gallons results
39.9 x 0.264172052 = 10.54046489076
39.9 l = 10.54 gal
To conclude the answer for 39.9 liters is ten point fifty four gallons