Cupfuls are a special type of measuring unit that has been around for centuries. Generally favored among bakers for measuring out ingredients, a cupful is a unit of measure equal to one-eighth of a gallon or eight fluid ounces. Its exact size may vary from country to country, but the amount it holds is always the same. Throughout the ages, cupfuls have featured significantly in cooking and baking recipes, and they continue to be an essential kitchen tool today. Cupfuls have been in use since at least the Medieval period when they were used as a standard size for measuring spices and other ingredients. Cups have often changed according to the country or region where they were used, and their sizes were based on a wide range of items, including coffee mugs, teacups and even beer mugs. In the United States, the customary cupful is equal to eight ounces. This is often the standard size used when following recipes given in cookbooks and other printed works. Cupfuls have remained a popular way to accurately measure ingredients in baking recipes because more precise measurements are not typically needed in baking. Their size also makes them convenient to use, as they can adequately measure most ingredients in one cupful. Additionally, measuring cupfuls often come in sets that come with varying sizes, allowing for exact measurements if required. As such, cupfuls can be an affordable, reliable and easy way to measure out ingredients while baking.