Why Do American Recipes Use Cups Instead of Grams?

Every few months, a professional baker publicly begs Americans to stop measuring with cups. Paul Hollywood did it in a Tasting Table interview: "You've got scales out there, so you can use grams. Just use grams." He finds the whole cup thing genuinely odd. And he is right about accuracy. But he is fighting more than a century of momentum.

It started with Fannie Farmer in 1896

Before 1896, American recipes were vague in a way that would make a modern cook weep. "Butter the size of an egg." "A teacup of sugar." "Flour enough to make a stiff dough." Then Fannie Farmer, principal of the Boston Cooking School, published the 1896 edition of The Boston Cooking-School Cook Book with level measurements as the standard: level cups, level tablespoons, level teaspoons.

She is literally called the Mother of Level Measurements, and her system won. It won because it democratized cooking. You did not need training, a scale, or judgment. You needed a set of tin cups and the instruction to level the top with a knife. Millions of American kitchens were organized around that simplicity, and nobody has managed to reorganize them since.

Metric never stood a chance in the American kitchen

The United States signed the metric treaty in 1875 but never adopted the metric system for daily life the way Britain did in the 1960s. America developed its own US customary system instead, and the kitchen became one of its strongest fortresses.

There is also a cultural stubbornness that food writer Food52 once described perfectly: in the age of recipe comments, writing "125 grams all-purpose flour" instead of "1 cup" can genuinely offend American readers. People learned from their grandmothers' index cards, and those cards say cups. Changing the unit feels, to many cooks, like changing the recipe itself.

The dirty secret: a cup is not even a cup

Here is the part that makes converters necessary. The word "cup" hides at least four different volumes:

• US customary cup: 236.6 ml
• Metric / Australian cup: 250 ml
• Japanese cup (gō): 200 ml
• Imperial cup (older UK): 284 ml

So an Australian blogger writing "1 cup of sugar" means 200 grams of sugar, while an American reading it measures 236.6 ml and gets about 190 grams. Neither of them is wrong. The unit is.

When cups are fine, and when they are not

I will defend cups for a few things. Soup, stews, sauces, and most savory cooking are forgiving; a 10 percent difference in diced onion changes nothing. For casual baking, cookies and quick breads, cups plus decent technique will get you a fine result most of the time.

Cups fail at bread and delicate cakes. Bread dough hydration is a tight ratio, and a scooped cup of flour throws it off by 20 grams or more per cup. Layer cakes, chiffon, and anything with whipped eggs are equally unforgiving. If you bake bread weekly, a 20-dollar scale is the highest-value tool in your kitchen. Full stop.

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