A half-cup of butter is equivalent to a quarter-pound in U.S. measures. This is 0.42 cups or 118.29 millilitres according to the British Imperial system. A quarter-pound of butter is packaged and sold as a stick in the United States.
In other parts of the world, butter is not measured by the stick, as it is in many American recipes. Instead, butter is measured by weight with a kitchen scale. A stick of butter is equal to 113.4 grammes when converting measurements from an American cookbook. In the United States, butter is frequently sold in boxes of four sticks, which totals 1 pound or 453.6 grammes.