A cup is not a weight — it depends on what is in it. Pick the ingredient, enter cups or grams, and get the matching measure from its real cup weight.
| Ingredient (1 US cup) | Grams |
|---|---|
| All-purpose flour | 125 g |
| Whole wheat flour | 113 g |
| Bread flour | 127 g |
| Cake flour | 114 g |
| Granulated sugar | 200 g |
| Brown sugar (packed) | 220 g |
| Powdered sugar | 120 g |
| Butter | 227 g |
| Cocoa powder | 100 g |
| Honey | 340 g |
| Milk | 245 g |
| Water | 236 g |
| Vegetable oil | 224 g |
| Rolled oats | 90 g |
| Rice (uncooked long grain) | 185 g |
| Chopped nuts | 120 g |
| Cornmeal | 138 g |
| Peanut butter | 258 g |
There is no single cups-to-grams conversion, because a cup measures volume and grams measure weight, and each ingredient packs into a cup at its own density. This converter uses a per-ingredient density table — standard published cup weights, from 90 g for a cup of rolled oats to 340 g for a cup of honey — and multiplies or divides by that figure. Flour figures assume flour spooned into the cup and levelled, which is how the standard weights are measured.
How many grams are in a cup of flour? For all-purpose flour, about 125 g per US cup when spooned and levelled. Scooping the cup straight from the bag packs in more flour and can push the same cup well past 140 g.
Why do other sites give different numbers? Because they often use one generic figure, such as 236 g for every ingredient, which is only right for water. A per-ingredient table is the only way cups-to-grams conversions stay accurate.