One cup of water is equal to eight fluid ounces, 0.5 pints, 0.25 quarts and 0.06 gallons when using U.S. standard measurements for volume. The metric equivalent of one standard U.S. cup is .95 metric cups.
The United States bases measurement on standard, or customary, units. This system was originally derived from the British Imperial units, but both have undergone changes, making them less similar. In the United States, standard units of measure are used for various purposes, such as sizes for consumer goods, but metric units are used as well. Sectors in the United States that use metric measurements include the medical and scientific fields.