Formula to convert 3.5 gallons to liters is to multiply 3.5 by 3.75841178 (this is the value for 1 gallon to liter).
Convert 3.5 Gallons to Liters results
3.5 x 3.78541178 = 13.24894123
3.5 gal = 13.25 l
It’s simple, the answer for 3.5 gallons is thirteen point two five liters