Cups depend on the ingredient, not a single factor
A cup measures volume; a gram measures weight. Denser ingredients pack more grams into the same cup, so the conversion changes with what you are measuring. One US cup holds about 125 g of flour but 200 g of sugar and 340 g of honey. Find your ingredient below, then divide.
Grams per US cup, by ingredient
| Ingredient | 1 cup | ½ cup | ¼ cup |
|---|---|---|---|
| All-purpose flour | 125 g | 63 g | 31 g |
| Bread flour | 130 g | 65 g | 33 g |
| Cake flour | 115 g | 58 g | 29 g |
| Granulated sugar | 200 g | 100 g | 50 g |
| Brown sugar (packed) | 220 g | 110 g | 55 g |
| Powdered sugar | 120 g | 60 g | 30 g |
| Butter | 227 g | 114 g | 57 g |
| White rice (uncooked) | 185 g | 93 g | 46 g |
| Rolled oats | 90 g | 45 g | 23 g |
| Honey | 340 g | 170 g | 85 g |
| Cocoa powder | 85 g | 43 g | 21 g |
| Water or milk | ~240 g | ~120 g | ~60 g |
Reverse it the same way: 300 g of granulated sugar is 300 ÷ 200 = 1½ cups.
Why the same cup of flour weighs 125 g or 150 g
- Scoop vs spoon-and-level. Dipping the cup into the bag compresses the flour to 140–150 g. Fluffing it, spooning it in and leveling with a knife gives 120–125 g — a 25% swing from method alone.
- Packed vs loose brown sugar. Pressed down it is 220 g a cup; loose it is closer to 140 g. Recipes almost always mean packed.
- Cup size varies by country. US 236.6 mL, metric 250 mL, imperial 284 mL. Four cups of one system differs from another by up to 20%.
- A scale removes the guesswork. 250 g on a scale is always 250 g, whatever the humidity or scooping style — which is why bakers weigh.
Common questions
How many grams are in one cup?
It depends entirely on the ingredient. One US cup is about 125 grams of all-purpose flour, 200 grams of granulated sugar, 227 grams of butter and 340 grams of honey. There is no single grams-per-cup number.
Why does grams to cups change by ingredient?
A cup is a measure of volume; a gram is a measure of weight. Denser ingredients pack more grams into the same cup, so flour and sugar fill a cup with very different weights.
Is a US cup the same as a metric cup?
No. A US cup is 236.6 mL, a metric cup (Australia, New Zealand) is 250 mL, and an old UK imperial cup is 284 mL. Use the cup the recipe was written for, or weigh in grams to sidestep the difference.
