Step 1
Pick the ingredient
A cup of flour does not weigh what a cup of sugar weighs. The number comes from the ingredient, not from a generic cup.
Convert cups to grams
Or grams to cups, milliliters, or ounces.
It depends on the ingredient, and on which cup you mean.
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How it works
Step 2
Enter the amount
Cups, grams, milliliters, tablespoons, or ounces. The result updates as you type. Both ways: cup to gram, and gram to cup.
Step 3
Read the source
Every figure cites USDA, King Arthur, NIST, or FDA. When two sources disagree, you see both. Nothing is buried in a PDF.
Cups to grams, with the right cup
A recipe from New York, one from Buenos Aires, and one from Madrid are not talking about the same cup.
The United States uses 236.588 ml (NIST). FDA nutrition labels round that to 240 ml. A lot of metric recipes use 250 ml. The imperial cup is about 284 ml.
At home, a teacup, a drinking glass, or a bowl is not a standard measure: those are marked as such here.
Why these numbers
Weight also depends on the ingredient. A US cup of all-purpose flour, spooned and leveled, is 120 g according to King Arthur Baking. USDA FoodData Central lists 125 g for that same cup.
Packing the flour raises it. Sifting lowers it. That is why this converter shows the source on every result, and why it will not promise what a scale can.
Butter is listed once. In several countries the word for lard is also used for butter; this figure is butter. A US stick is 113 g.
0000 flour is not a separate King Arthur product: it sits closest to cake or pastry flour. 0 and 00 sit closest to bread flour. The detail is in the questions.
You can paste an ingredient list. That reading happens in your browser. If a line is not understood, you edit it yourself. Then you copy or print a card of your recipe — not a ranking, and not a weekly roundup.
Sources
USDA FoodData Central — weights per US cup, nutrition reference.
King Arthur Baking Ingredient Weight Chart — spoon and level, baking.
NIST Handbook 44 — US cup volume: 236.588 ml.
FDA 21 CFR 101.9 — labeling cup: 240 ml.
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Eight common equivalents
| Measure | Equivalent | Source |
|---|---|---|
| 1 US cup all-purpose flour | 120 g (USDA: 125 g) | King Arthur / USDA |
| 1 US cup granulated sugar | 198 g | King Arthur |
| 1 US cup butter | 226 g | King Arthur |
| 1 US stick of butter | 113 g | King Arthur |
| 1 US cup | 236.588 ml | NIST |
| 1 metric cup | 250 ml | metric use |
| 1 tablespoon | 15 ml | FDA |
| 1 teaspoon | 5 ml | FDA |
Milliliters are the vessel; grams come from the ingredient.
Questions
How many grams in a cup of all-purpose flour?
King Arthur, spooned and leveled, gives 120 g per US cup. USDA FoodData Central lists 125 g. Mismedidas shows both. Packing changes the weight.
Which cup should I use?
US recipes: US NIST cup (236.588 ml). Nutrition labels: FDA 240 ml. Metric recipes: 250 ml. Imperial: 284 ml. A teacup, a bowl, and a drinking glass are not standardized.
Why don't USDA and King Arthur agree?
They measure the same US cup with different methods. King Arthur uses spoon-and-level (120 g). USDA publishes 125 g. Neither figure is a mistake; they are two sources. You see both.
Does this work for 0000 flour?
0000 is not a separate product here. It sits closest to cake or pastry flour. Pick one of those, and if the recipe is fussy, confirm with a scale.
What are 0, 00, 000, and 0000 flour?
In parts of the Río de la Plata the zeros mark the grind, not a King Arthur brand.
000 is usually all-purpose. 0000 sits closest to cake or pastry flour. 0 and 00 sit closest to bread flour.
The supermarket bag may not say “cake” or “pastry”. Pick the nearest one; we do not invent a different weight without a source.
Is Royal baking powder or yeast?
In many kitchens Royal is baking powder. It is not baking soda, and it is not bread yeast.
Baking soda is bicarbonate. Instant yeast is the dry kind for dough. All three are listed separately because they do not weigh the same.
What about fresh yeast in cubes?
Not yet. Fresh yeast is used in a different amount than instant. When there is a cited figure, it goes in. Until then, do not convert it as if it were the packet kind.
Why does brown sugar say packed?
King Arthur weighs US brown sugar pressed into the cup (213 g). In several countries the local brown sugar is scooped loose, like white, and weighs less. If you do not pack it, treat the number as a ceiling, not a scale.
Can I paste a whole recipe?
Yes. Paste the list. Each line is read in your browser. If one is not understood, you edit it yourself. Nothing is sent to a server.
Does this replace a scale?
No. It is a cited equivalent, not a weighing. Packing, sifting, or changing cups changes the result.
Do my recipes leave this device?
No. The conversion runs in your browser. There are no accounts and no file uploads.
Can I keep it as an app?
Yes. On a phone, the Safari or Chrome icons are drawn above, under the converter. On a computer, Chrome or Edge may show a prompt to install it in this same window.