What is 1 third of a gallon?

One third of a gallon is equivalent to approximately 0.3333 gallons. To calculate this, you would divide 1 by 3, which equals 0.3333 recurring. This can also be expressed as 33.33% of a gallon. In volume measurements, this would be roughly equal to 42.67 fluid ounces or 1.32 liters.