A quarter-pound of butter is equal to a half-cup in U.S. measurements. In the British Imperial system of measurements, this is 0.42 cup or 118.29 milliliters. In the U.S., a quarter-pound of butter is packaged and sold as a stick.
Cooks in other parts of the world do not measure butter by the stick, as many U.S. recipes do. Instead, they measure butter by weight, using a kitchen scale. When converting measurements from an American cookbook, a stick of butter is equal to 113.4 grams. In the U.S., butter is often sold in boxes of four sticks, which comes to a total of 1 pound, or 453.6 grams.