Caster Sugar: Cups to Grams
Caster Sugar (also called superfine sugar) weighs 225 g per US cup — so a recipe in cups and a recipe in grams can be swapped either way. 100 g is 1/2 cup, and 2 cups is 450 g.
💡 Tip: There's no US equivalent of caster sugar — make your own by blitzing regular granulated sugar in a food processor for 10–20 seconds until fine but not powdery (over-processing turns it into powdered sugar).
Cups to grams chart for caster sugar
| Cups | Grams | Ounces |
|---|---|---|
| 1/4 | 56.3 | 1.98 |
| 1/3 | 75 | 2.65 |
| 1/2 | 113 | 3.97 |
| 2/3 | 150 | 5.29 |
| 3/4 | 169 | 5.95 |
| 1 | 225 | 7.94 |
| 1 1/2 | 338 | 11.9 |
| 2 | 450 | 15.9 |
| 3 | 675 | 23.8 |
Grams to cups chart for caster sugar
| Grams | Amount | Ounces |
|---|---|---|
| 25 | 1 3/4 tbsp | 0.88 |
| 50 | 1/4 cup | 1.76 |
| 75 | 1/3 cup | 2.65 |
| 100 | 1/2 cup | 3.53 |
| 150 | 2/3 cup | 5.29 |
| 200 | 7/8 cup | 7.05 |
| 225 | 1 cup | 7.94 |
| 250 | 1 1/8 cups | 8.82 |
| 300 | 1 1/3 cups | 10.6 |
| 400 | 1 3/4 cups | 14.1 |
| 500 | 2 1/4 cups | 17.6 |
Spoon reference: 1 tablespoon ≈ 14.1 g, 1 teaspoon ≈ 4.69 g.
Caster Sugar against the other sugars & sweeteners
At 225 g per cup, caster sugar is the heaviest of the 10 sugars & sweeteners charted here — 88% heavier per cup than powdered sugar, the lightest at 120 g.
Substituting by volume shifts the weight: a cup of muscovado sugar in place of caster sugar is about 5 g lighter, so convert to grams before swapping.
Caster Sugar conversion questions
- How many grams is 1 cup of caster sugar?
- 1 US cup of caster sugar weighs about 225 grams, or 7.94 ounces.
- How many cups is 225g of caster sugar?
- 225g of caster sugar is exactly 1 cup (it's the density used here, 225g per cup).
- How many cups is 200g of caster sugar?
- 200g of caster sugar is about ⅞ cup (200 ÷ 225 = 0.89).
- How many cups is 150g of caster sugar?
- 150g of caster sugar is ⅔ cup (150 ÷ 225 = 0.67).
- How many cups is 100g of caster sugar?
- 100g of caster sugar is a touch under ½ cup (100 ÷ 225 = 0.44).
- How many cups is 50g of caster sugar?
- 50g of caster sugar is about ¼ cup (50 ÷ 225 = 0.22).
- Can I use granulated sugar instead of caster sugar?
- Yes — swap 1:1 by weight. Caster is just superfine granulated, so it dissolves faster (better for meringues, creaming and delicate batters), but the sweetness and weight are identical.
- How many cups is 250g of caster sugar?
- About 1 1/8 cups — that is 250 divided by the 225 g a cup weighs.