There are approximately 1.0567 U.S. gallons in 4 liters. To convert liters to gallons, you multiply the number of liters by 0.26417. So, 4 liters × 0.26417 equals roughly 1.0567 gallons. Keep in mind this is for U.S. liquid gallons; the UK (imperial) gallon is different 4 liters would be about 0.88 imperial gallons. Always check the measurement system you're using