Was ist ein/eine US Cup (cup)?
Formal Definition
The US customary cup is a unit of volume equal to 8 US fluid ounces, one sixteenth of a US gallon, or one half of a US pint. This equals exactly 14.4375 cubic inches or approximately 236.588 milliliters. The cup is divided into 16 tablespoons, 48 teaspoons, or 8 fluid ounces.
The US cup should be distinguished from the metric cup (exactly 250 mL), used in Australia, Canada, and some other countries, and from the Japanese cup (200 mL). The US legal cup, used in nutritional labeling, is defined as exactly 240 mL (slightly larger than the US customary cup of 236.588 mL). These differences are small but can affect recipe precision.
The Standard of American Cooking
The cup is the fundamental measuring unit in American cooking. Unlike most of the world, where recipes specify ingredients by weight (in grams) using a kitchen scale, American recipes traditionally measure both liquid and dry ingredients by volume using cups, tablespoons, and teaspoons. This volumetric approach to cooking is deeply embedded in American food culture.
Etymology
A Practical Name
The word "cup" comes from the Old English "cuppe" and the Late Latin "cuppa" (cup, drinking vessel), which may ultimately derive from the Latin "cupa" (tub, barrel). Unlike units named after scientists or derived from Latin number words, the cup takes its name directly from the common drinking vessel.
The cup became a standardized measuring unit in American cooking during the late 19th century, when Fannie Farmer's Boston Cooking-School Cook Book (1896) popularized precise volumetric measurements in recipes. Before Farmer, recipes used imprecise terms like "a teacup of flour" or "a coffee cup of sugar." Farmer standardized the cup as a leveled, specific volume and transformed American cooking instruction.
Precise Definition
US Customary Cup
The US customary cup is defined as 1/2 US pint = 1/16 US gallon = 8 US fluid ounces = 14.4375 cubic inches = 236.5882365 mL.
US Legal Cup
The US legal cup, used on Nutrition Facts labels, is defined as exactly 240 mL. This simplified definition makes it easier to convert between metric and customary units on food labels. The difference between the legal cup (240 mL) and the customary cup (236.588 mL) is about 1.4%.
Metric Cup
The metric cup, used in Australia, Canada, New Zealand, and some other countries, is defined as exactly 250 mL. This is about 5.7% larger than the US customary cup.
Japanese Cup
The Japanese cup (gou, 合) is 200 mL, used for measuring rice and other ingredients in Japanese cooking. It is about 15.5% smaller than the US cup.
Geschichte
Fannie Farmer and the Standardized Cup
The cup as a precise cooking measurement is largely an American innovation, dating to the late 19th century. Before standardization, American and British recipes used imprecise volume measurements: "a teacup," "a coffee cup," "a breakfast cup," or "a wine glass" of an ingredient. These containers varied widely in size.
Fannie Merritt Farmer (1857-1915), director of the Boston Cooking-School, revolutionized American cooking in her 1896 cookbook by insisting on precise, standardized measurements. Her book, which became the best-selling American cookbook for decades, specified "level cups" and "level teaspoons" — carefully measured, leveled amounts rather than the heaped or approximated measures of earlier cooking.
Standardization and Mass Production
The standardization of the cup coincided with the mass production of measuring cups and spoons. Manufacturers produced nested sets of dry measuring cups (1 cup, 1/2 cup, 1/3 cup, 1/4 cup) and glass liquid measuring cups (marked in cups, ounces, and sometimes milliliters). These standardized tools became fixtures of American kitchens by the mid-20th century.
Why America Cooks by Volume
The American preference for volume measurement in cooking — rather than weight measurement, which is standard in most of the world — has roots in the practical circumstances of 19th-century American kitchens. Kitchen scales were expensive and fragile. Measuring cups and spoons were cheap, durable, and easy to use. The cup-based system proved "good enough" for American home cooking and became culturally entrenched, even though weight-based measurement is inherently more precise (especially for dry ingredients like flour, whose density varies with packing).
Aktuelle Verwendung
In American Cooking
The cup is the dominant volume unit in American recipes. Flour, sugar, rice, and other dry ingredients are measured in cups in virtually every American recipe, cookbook, and cooking show. Liquids — water, milk, oil, broth — are also measured in cups. A standard American recipe might call for "2 cups of flour, 1 cup of sugar, 1/2 cup of butter, 1 cup of milk." This system is taught in American home economics classes and cooking courses.
In Coffee Culture
The cup is the standard unit for coffee, both as a beverage measure and as a machine specification. American coffee makers are rated in cups (4-cup, 8-cup, 12-cup), though a "coffee cup" in this context is typically 5-6 fluid ounces (148-177 mL), not the full 8-ounce standard cup. A Starbucks "tall" is 12 fl oz (1.5 cups), a "grande" is 16 fl oz (2 cups), and a "venti" is 20 fl oz (2.5 cups).
On Food Labels
The US FDA uses the "legal cup" of 240 mL as a reference for serving sizes on Nutrition Facts labels. A serving of cereal might be "1 cup (30 g)," a serving of milk "1 cup (240 mL)," or a serving of pasta "1 cup cooked (140 g)." These legal cup servings appear on virtually every packaged food in the United States.
International Impact
American cup measurements appear in recipes worldwide due to the global influence of American food media, cookbooks, and websites. International cooks often need to convert cups to grams or milliliters when following American recipes. This has led to a proliferation of online conversion tools and recipe apps that handle cup-to-metric conversions.
Everyday Use
Morning to Night
The cup follows Americans through their day. Morning coffee: 1-2 cups. Breakfast cereal: 1 cup serving. A recipe for lunch: 2 cups of chopped vegetables. Baking cookies: 2.25 cups of flour, 1 cup of butter, 3/4 cup of sugar. Dinner: 1 cup of rice. Water intake: health guidelines suggest 8 cups (64 ounces) per day, though this is a rough approximation.
Baking and Cooking
In American baking, the cup is indispensable. Every American baker owns measuring cups. A standard chocolate chip cookie recipe (like the Toll House recipe on Nestle packages) specifies ingredients in cups. Converting between cups and grams requires knowing the density of each ingredient: 1 cup of all-purpose flour ≈ 125 g, 1 cup of granulated sugar ≈ 200 g, 1 cup of butter ≈ 227 g (2 sticks).
Hydration
The "8 cups of water a day" guideline (64 fl oz or approximately 1.9 liters) is one of the most widely known health recommendations in American culture, though its scientific basis is debated. Many Americans think of their daily water intake in cups.
Kitchen Equipment
American kitchen equipment is sized in cups. Rice cookers: 3-cup, 6-cup, 10-cup. Blenders: 4-cup, 8-cup. Food processors: 7-cup, 11-cup, 14-cup. These cup-based ratings help consumers choose appropriately sized appliances.
In Science & Industry
Not Used in Science
The cup is never used in scientific contexts. All scientific measurement uses milliliters and liters. Even American laboratories and research institutions use metric volume units exclusively.
Nutrition Science
In nutrition science, the US legal cup (240 mL) appears in dietary guidelines and food composition databases. The USDA FoodData Central database provides nutrient values per 100 g and per standard serving sizes, which often include cup measures for consumer familiarity.
Interesting Facts
Fannie Farmer's 1896 Boston Cooking-School Cook Book popularized the standardized cup as a cooking measurement. Before her, recipes used vague measures like 'a teacup of flour' or 'a tumbler of milk.'
The US customary cup (236.588 mL), the US legal cup (240 mL), the metric cup (250 mL), and the Japanese cup (200 mL) are all different sizes — a source of confusion when following international recipes.
A 'coffee cup' on American coffee makers is typically 5-6 fluid ounces (148-177 mL), not the standard 8-ounce cup. A '12-cup' coffee maker makes about 60 ounces, or 7.5 standard cups.
One cup of all-purpose flour weighs about 125 grams, but this varies by 20% or more depending on how the flour is scooped. This is why professional bakers worldwide prefer weight measurements over cups.
The '8 cups of water a day' health recommendation (64 fl oz) is one of the most widely known — and most debated — health guidelines in American culture. Its origin is unclear and the evidence is mixed.
American measuring cups come in two types: dry measuring cups (flat-topped for leveling) and liquid measuring cups (transparent with a pouring spout). Using the wrong type can affect measurement accuracy.
A stick of American butter is exactly 1/2 cup (8 tablespoons, 113 g). This convenient relationship is printed on butter wrappers and is deeply embedded in American baking culture.
Japan uses a 200 mL cup (gou, 合) for measuring rice. One gou of uncooked rice makes about two servings. Japanese rice cookers are sized by the number of gou they can hold.
Regional Variations
United States
The cup is the fundamental cooking measurement in the US. Every American kitchen has measuring cups. Recipes, food labels, and cooking education all use cups. The US customary cup (236.588 mL) is the standard, while the US legal cup (240 mL) appears on food labels.
Australia, Canada, New Zealand
These countries use the metric cup of exactly 250 mL. Recipes published in these countries use the metric cup, which is about 5.7% larger than the US cup. This difference can affect recipes, especially in baking.
Japan
Japan uses a 200 mL cup (gou) for measuring rice and some cooking ingredients. Japanese rice cookers are rated in gou rather than in metric cups.
United Kingdom and Continental Europe
The UK and continental Europe do not use cups as a standard measurement. Recipes specify ingredients by weight (grams) using kitchen scales. British measuring jugs show milliliters and fluid ounces, not cups. However, some British cookbooks aimed at beginners include cup measurements alongside metric weights for convenience.
The Global Trend
The international trend is strongly toward weight-based cooking measurement (grams and kilograms), which is inherently more precise and consistent than volumetric measurement. Professional chefs worldwide, including many American professionals, prefer weight measurement.