A cup in the United States is 48 teaspoons. The system of conversations in the United States is rather odd; there is no base unit to use for decimal points up and down the line. Instead, it’s some weird number in most cases. However, the rest of the measuring units are a little more reasonable. There are two cups in a pint. There are two pints in a quart, or four cups to a quart. There are four quarts in a gallon, which translates down to eight quarts or sixteen cups, depending on what you’re using.
This can be very helpful to know, in case you’re short a teaspoon or having to use one of the other insanely odd measuring units while cooking in the United States.