Cup (US) a Deciliter Conversor

A cup is a unit of volume in the US customary and imperial measurement systems, primarily used in cooking and baking. The US customary cup is defined as exactly 236.5882365 milliliters (approximately 237 ml), equal to 8 US fluid ounces, ½ US pint, or ¼ US quart. The metric cup, used in Australia, Canada, and other countries, is defined as exactly 250 milliliters, slightly larger than the US cup. The cup is one of the most frequently used volume measurements in American cooking. Dry ingredients like flour, sugar, and oats as well as liquids like water, milk, and oil are commonly measured in cups. Because the cup is a volume unit rather than a weight unit, the mass of a cup of an ingredient varies significantly depending on the density of that ingredient. It is important to note that there are several different "cups" in use internationally: the US customary cup (236.6 ml), the US legal cup used in food labeling (240 ml), the metric cup (250 ml), and the imperial cup (284.1 ml). When following international recipes, clarifying which cup standard is being used can be important.

The cup as a cooking measurement emerged in American culinary practice in the 19th century. Fannie Farmer, the influential American cookbook author, is widely credited with popularizing standardized cup measurements in her 1896 "Boston Cooking-School Cook Book." Before standardization, recipes used imprecise terms like "a teacup" or "a coffee cup," which varied widely in size. The US customary cup was standardized as 8 fluid ounces, and standardized measuring cups became widely available as kitchen tools in the early 20th century. This standardization transformed cooking from an art requiring experience and judgment to a more precise, reproducible activity accessible to home cooks without professional training. Other countries developed their own cup standards. Australia standardized the metric cup at 250 ml in the 1970s when adopting the metric system, while the UK moved away from cup measurements toward weight-based recipes, making milliliters and grams the norm in British cooking.

The cup remains the dominant volume measurement for cooking in the United States, used in virtually all American recipes for both liquids and dry ingredients. American measuring cup sets (typically 1 cup, ½ cup, ⅓ cup, and ¼ cup) are standard kitchen equipment. Food packaging in the US often lists serving sizes in cups for products like cereal, rice, and pasta. In Canada and Australia, the metric cup (250 ml) is commonly used in cooking, though cup measurements are used less frequently than in the US. International recipe conversions between US cups and milliliters or grams are among the most common cooking measurement conversions, making cup-to-ml conversion tools highly valuable for home cooks worldwide.