How many grams is a quarter cup of caster sugar?
¼ cup of caster sugar ≈ 47.5 g
Because one US cup of caster sugar weighs about 190 grams, a quarter cup of it is roughly 47.5 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.