Caster Sugar in Grams: How Many Grams in a Cup?
Convert caster sugar from cups to grams and ounces with precision for any recipe.
1 cup of caster sugar weighs 200 grams.
≈ 7.05 oz (weight)
Interactive Converter
1 cup of Caster sugar weighs 200 grams.
200g (7.05 oz)
Level, unpacked US cupCaster sugar
US & UK alternative namesSpoon into cup & level off with a knife.
Prevent packing errorsCaster sugar cups to grams
Complete conversion reference chart for standard US cup measurements to grams and ounces.
| Cups (US) | Grams (g) | Ounces (oz) | Tablespoons (tbsp) |
|---|---|---|---|
| 1/8 cup | 25g | 0.88 oz | 2 tbsp |
| 1/4 cup | 50g | 1.8 oz | 4 tbsp |
| 1/3 cup | 67g | 2.4 oz | 5.3 tbsp |
| 1/2 cup | 100g | 3.5 oz | 8 tbsp |
| 2/3 cup | 133g | 4.7 oz | 10.7 tbsp |
| 3/4 cup | 150g | 5.3 oz | 12 tbsp |
| 1 cup | 200g | 7.1 oz | 16 tbsp |
| 1 1/2 cups | 300g | 10.6 oz | 24 tbsp |
| 2 cups | 400g | 14.1 oz | 32 tbsp |
| 3 cups | 600g | 21.16 oz | 48 tbsp |
| 4 cups | 800g | 28.22 oz | 64 tbsp |
| 5 cups | 1000g | 35.27 oz | 80 tbsp |
| Weight (Grams) | Cups (US) | Ounces (oz) | Tablespoons (tbsp) |
|---|---|---|---|
| 25g | ≈ 1/4 cup (0.13) | 0.88 oz | 2 tbsp |
| 50g | ≈ 1/4 cup (0.25) | 1.76 oz | 4 tbsp |
| 75g | ≈ 1/2 cup (0.38) | 2.65 oz | 6 tbsp |
| 100g | ≈ 1/2 cup (0.50) | 3.53 oz | 8 tbsp |
| 125g | ≈ 3/4 cup (0.63) | 4.41 oz | 10 tbsp |
| 150g | ≈ 3/4 cup (0.75) | 5.29 oz | 12 tbsp |
| 200g | ≈ 1 cup (1.00) | 7.05 oz | 16 tbsp |
| 250g | ≈ 1 1/4 cups (1.25) | 8.82 oz | 20 tbsp |
| 300g | ≈ 1 1/2 cups (1.50) | 10.58 oz | 24 tbsp |
| 350g | ≈ 1 3/4 cups (1.75) | 12.35 oz | 28 tbsp |
| 400g | ≈ 2 cups (2.00) | 14.11 oz | 32 tbsp |
| 500g | ≈ 2 1/2 cups (2.50) | 17.64 oz | 40 tbsp |
1 cup of caster sugar weighs 200 grams. Caster sugar is finer than granulated white sugar, which means it packs slightly more tightly per cup. If substituting, weigh rather than swapping cup for cup.
You may see this written as caster sugar (UK) or superfine sugar (US). It is the same food, so the weights are identical. We list both because our readers search both ways.
For the most accurate results, weigh your caster sugar with a digital kitchen scale — the values below assume a level, unpacked cup.
Caster sugar ounces to grams
| Ounces | Grams | Cups |
|---|---|---|
| 1 oz | 28g | 0.14 cups |
| 2 oz | 57g | 0.28 cups |
| 3 oz | 85g | 0.43 cups |
| 4 oz | 113g | 0.57 cups |
| 6 oz | 170g | 0.85 cups |
| 8 oz | 227g | 1.13 cups |
| 10 oz | 283g | 1.42 cups |
| 12 oz | 340g | 1.7 cups |
| 16 oz | 454g | 2.27 cups |
Frequently asked questions
How many grams is 1 cup of caster sugar?
1 cup of caster sugar weighs 200g.
How many grams is 1/2 cup of caster sugar?
1/2 cup of caster sugar weighs 100g.
How many grams is 1/4 cup of caster sugar?
1/4 cup of caster sugar weighs 50g.
How many cups is 100g of caster sugar?
100g of caster sugar is approximately 0.5 cups.
How many grams is 2 cups of caster sugar?
2 cups of caster sugar weighs 400g.
How many grams is 1/3 cup of caster sugar?
1/3 cup of caster sugar weighs 67g.
How many ounces is 1 cup of caster sugar?
1 cup of caster sugar weighs approximately 7.1 ounces (200g).
How many grams is 3 cups of caster sugar?
3 cups of caster sugar weighs 600g.
Practical baking & cooking tips for caster sugar
- Caster sugar has the same density as granulated sugar: 1 cup weighs 200 grams.
- Essential for Swiss and French meringues because fine crystals dissolve before egg white proteins coagulate.
- If unavailable in US supermarkets, make it by pulsing regular white sugar in a blender for 15 seconds.
Common substitutions for caster sugar
| Substitute | Ratio | Kitchen Notes |
|---|---|---|
| Granulated white sugar | 1:1 by weight (200g) | Slightly coarser crystals; cream 2 minutes longer to fully dissolve |
| Icing sugar | 1:1 only in buttercreams and glazes | Contains cornstarch; do not use in sponge cakes or meringues |
Why accuracy matters for caster sugar
Caster sugar crystals are significantly finer than regular granulated sugar, allowing them to dissolve rapidly into creamed butter, cold liquids, and egg whites without grittiness.
Who needs grams for caster sugar?
Meringue makers, macaron bakers, cocktail mixologists, and soufflé chefs.
Common mistakes to avoid with caster sugar
- Using granulated sugar instead of caster sugar in delicate cakes, resulting in grainy texture.
- Not dissolving caster sugar properly in cold liquids.
- Mistaking icing sugar for caster sugar, which can affect baking results.
Caster sugar in other kitchen units
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