When it comes to measurement, the use of the Metric System and the U.S. Standard Measurement System has long been discussed. While a large majority of the world’s countries use the Metric System, there are still a handful which adhere to the U.S. Standard. These differences can indeed result in a disaster in the kitchen if you do not know how to convert the measurements!
US Chart of Measures - The 128 oz gallon exists ONLY in the United States. The rest of the world uses the Imperial system with a 40 oz quart. That is, those who haven't graduated to the less complicated metric system. Imperial - Gallon is 160 ounces (4.54 Liters); a Quart is 40 ounces (1.25 Liters); a pint is 2 1/2 cups (20 ounces or 512 ml)
Sewing Conversion Table - Convert between Metric & Imperial measurements. There is a link to a PDF file towards the end of her post. This will be handy when you've a free tutorial that uses "the other" measurements. :-)