Caster sugar, Cups to Grams & Grams to Cups
1 cup of caster sugar = 225 grams · 100g = 0.44 cups
Also known as superfine sugar.
Caster sugar (superfine sugar) is granulated sugar ground finer so it dissolves quickly, which makes it the British baker's choice for meringues, sponges and delicate creaming. The finer crystals pack a little tighter, so a cup runs heavier than ordinary granulated at about 225g. In the US you can make it by briefly pulsing granulated sugar in a blender.
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Caster sugar cups to grams table
| Cups | Grams | Ounces | Tablespoons |
|---|---|---|---|
| 1/8 | 28.1 g | 0.99 oz | 2 |
| 1/4 | 56.2 g | 1.98 oz | 4 |
| 1/3 | 74.9 g | 2.64 oz | 5.33 |
| 1/2 | 112 g | 3.97 oz | 8 |
| 2/3 | 150 g | 5.29 oz | 10.7 |
| 3/4 | 169 g | 5.95 oz | 12 |
| 1 | 225 g | 7.94 oz | 16 |
| 1 1/2 | 338 g | 11.9 oz | 24 |
| 2 | 450 g | 15.9 oz | 32 |
| 3 | 675 g | 23.8 oz | 48 |
Caster sugar grams to cups table
Working the other way? Here's how many cups common gram weights of caster sugar come to, handy when a recipe lists caster sugar in grams but you only have cup measures.
| Grams | Cups | Ounces | Tablespoons |
|---|---|---|---|
| 25 g | 0.11 | 0.88 oz | 1.78 |
| 50 g | 0.22 | 1.76 oz | 3.56 |
| 75 g | 0.33 | 2.65 oz | 5.33 |
| 100 g | 0.44 | 3.53 oz | 7.11 |
| 125 g | 0.56 | 4.41 oz | 8.89 |
| 150 g | 0.67 | 5.29 oz | 10.7 |
| 175 g | 0.78 | 6.17 oz | 12.4 |
| 200 g | 0.89 | 7.05 oz | 14.2 |
| 225 g | 1 | 7.94 oz | 16 |
| 250 g | 1.11 | 8.82 oz | 17.8 |
| 300 g | 1.33 | 10.6 oz | 21.3 |
| 350 g | 1.56 | 12.3 oz | 24.9 |
| 400 g | 1.78 | 14.1 oz | 28.4 |
| 500 g | 2.22 | 17.6 oz | 35.6 |
Caster sugar: US, metric & UK cups compared
A “cup” isn’t the same size everywhere, so 1 cup of caster sugar weighs a different number of grams depending on which cup your recipe uses. The US cup is 236.6 ml, while Australia, New Zealand, Canada and modern UK recipes use a 250 ml metric cup. Here’s 1 cup of caster sugar in each:
| Cup standard | Size | 1 cup caster sugar | Used in |
|---|---|---|---|
| US cup | 237 ml | 225 g | United States (most US recipe sites) |
| Metric cup | 250 ml | 238 g | Australia, NZ, Canada & modern UK |
| UK imperial cup | 284 ml | 270 g | Older British recipes |
| Japanese cup | 200 ml | 190 g | Japan |
Unless a recipe says otherwise, US recipes mean the US cup and Australian/UK recipes mean the 250 ml metric cup. The tables higher up this page use the US cup.
Related ingredients
Quick reference: Caster sugar in grams
- ⅛ cup caster sugar = 28.1g
- ¼ cup caster sugar = 56.2g
- ⅓ cup caster sugar = 74.9g
- ½ cup caster sugar = 112g
- ⅔ cup caster sugar = 150g
- ¾ cup caster sugar = 169g
- 1 cup caster sugar = 225g
- 2 cups caster sugar = 450g
How many cups is 100g, 200g or 300g of caster sugar?
Because one cup of caster sugar weighs about 225 grams, you can convert any weight to cups by dividing by 225. So 100g of caster sugar is about 0.44 cups, 200g is about 0.89 cups, 250g is about 1.11 cups, and 300g is about 1.33 cups. For any other amount, type the grams straight into the converter above and switch it to show cups.
How to measure caster sugar accurately
For the most reliable baking results, weigh caster sugar (also called superfine sugar) on a kitchen scale rather than scooping by volume. One US cup of caster sugar weighs about 225 grams (7.94 oz), but the exact figure changes with how tightly it's packed and the brand. Scooping straight from the bag compacts caster sugar and can leave you 15 to 20% over, so spoon it into the cup and level it off for the closest match to the figures above. Use the tables for quick reference, or the converter for any custom amount in cups, grams, ounces or tablespoons.
Tip: Caster sugar dissolves faster than granulated, so it's worth the swap for meringues and cold drinks where gritty undissolved sugar would show.
Caster sugar conversions: common questions
How many grams are in a cup of caster sugar?
One US cup of caster sugar weighs approximately 225 grams (7.94 oz).
How many grams in half a cup of caster sugar?
Half a cup (½ cup) of caster sugar weighs approximately 112 grams.
How many grams in a quarter cup of caster sugar?
A quarter cup (¼ cup) of caster sugar weighs approximately 56.2 grams.
How do I convert caster sugar from cups to grams?
Multiply the number of cups by 225. For example, 2 cups of caster sugar = 450 grams, and ¾ cup = 169 grams.
How many cups is 100g of caster sugar?
100 grams of caster sugar is about 0.44 cups. 200g is about 0.89 cups and 300g is about 1.33 cups, since 1 cup weighs 225 grams.
How many grams in a metric (Australian) cup of caster sugar?
One 250 ml metric cup of caster sugar, used in Australia, New Zealand, Canada and modern UK recipes, weighs about 238 grams, compared with 225 grams for a 236.6 ml US cup.