Gallons (US liquid) to liters conversion calculator shown above calculates how many liters are in 'X' gallons (US liquid) (where 'X' is the number of gallons (US liquid) to convert to liters). In order to convert a value from gallons (US liquid) to liters (from gal to L) type the number of gal to be converted to L and then click on the 'convert' button.