Caster sugar: cups to grams
1 cup of caster sugar (superfine sugar) weighs
190g
In a 250ml metric cup (Australia, NZ): 201g
Caster sugar is finer than granulated, so a cup holds a little less: 190g against 200g.
Cups
| Amount | US cup | Metric cup |
|---|---|---|
| ¼ cup | 48g | 50g |
| ⅓ cup | 63g | 67g |
| ½ cup | 95g | 100g |
| ⅔ cup | 127g | 134g |
| ¾ cup | 143g | 151g |
| 1 cup | 190g | 201g |
| 2 cups | 380g | 402g |
A US cup is 237ml. Use the metric column for Australian and New Zealand recipes.
Spoons
| Amount | Weight | Australian tbsp (20ml) |
|---|---|---|
| 1 tablespoon | 12g | 16g |
| 1 teaspoon | 4g |
Quick answers
- 1 cup of caster sugar
- Half a cup of caster sugar
- A quarter cup of caster sugar
- 1 tablespoon of caster sugar
Where these numbers come from
King Arthur Baking, Ingredient weight chart, checked 2026-10-25. USDA doesn't measure this ingredient, so we use this source instead. It lists:
- Baker's Special Sugar (superfine sugar, castor sugar): 1 cup = 190g
Fractions of a cup are the cup weight scaled down. The tablespoon is the cup weight divided by 16. The teaspoon is a third of the tablespoon. Metric-cup figures assume a 250ml cup, and Australian tablespoons hold 20ml. Weights under 10g are rounded to 0.1g, everything else to the nearest gram. Full source list.
Convert another amount
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