640 oz is 5 gallons. In this 640 oz is how many gallons content, you can find every detail and share your comments with us. Your valuable opinions are very important to our editorial team.
Convert Ounces to Gallons instantly with our online ounces to gallons converter. No registration is required. Ounces to Gallons conversion chart is also available.
Gallons vs Ounces: The most basic relationship between gallons and ounces is that 1 gallon equals 128 fluid ounces. This means if you have 2 gallons then you have 256 ounces.