How many grams is one cup of caster sugar?
1 cup of caster sugar ≈ 190 g
Because one US cup of caster sugar weighs about 190 grams, one cup of it is roughly 190 grams. Caster (superfine) sugar has smaller crystals than granulated sugar, so it settles a little lighter.
Recipes that list caster sugar in cups assume an average density. The figure above is a sensible typical value; if your recipe is sensitive, weigh on a kitchen scale — see our methodology.
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Caster sugar conversion chart
| Cups | Grams | Ounces | Tablespoons |
|---|---|---|---|
| ⅛ cup | 23.75 g | 0.838 oz | 2 |
| ¼ cup | 47.5 g | 1.68 oz | 4 |
| ⅓ cup | 63.33 g | 2.23 oz | 5.33 |
| ½ cup | 95 g | 3.35 oz | 8 |
| ⅔ cup | 126.7 g | 4.47 oz | 10.67 |
| ¾ cup | 142.5 g | 5.03 oz | 12 |
| 1 cup | 190 g | 6.7 oz | 16 |
| 1¼ cups | 237.5 g | 8.38 oz | 20 |
| 1½ cups | 285 g | 10.05 oz | 24 |
| 2 cups | 380 g | 13.4 oz | 32 |
| 3 cups | 570 g | 20.11 oz | 48 |
Other caster sugar conversions
* Conversion figures are typical average weights for one US customary cup (236.6 ml), based on the King Arthur Baking Ingredient Weight Chart and cross-referenced with the U.S. Department of Agriculture FoodData Central database. Actual weight varies with packing, brand and humidity — see our methodology.