Caster Sugar (superfine): Grams to Cups
1 cup of caster sugar (superfine) = 190 grams
One US cup of caster sugar (superfine) weighs 190 grams. One 250 ml metric cup — the one used in the UK, Australia, New Zealand and Canada — holds 201 grams. To convert any weight, divide the grams by the figure for your cup.
Caster (superfine) sugar weighs about 190 g per cup — King Arthur Baking's figure for its superfine sugar. The finer crystals leave slightly more air between them than granulated sugar's 200 g, so swap by weight, not volume.
Where the 190 g figure comes from
- King Arthur Baking ingredient weight chart: Baker's Special Sugar (superfine sugar, castor sugar), 1 cup = 190 g (chart)
This site uses 190 g per US cup of caster sugar (superfine), spooned and levelled. References checked September 2026.
How many cups is X grams of caster sugar (superfine)?
| Grams | US cups | Metric cups | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g caster sugar (superfine) | ⅛ | ⅛ | 2.11 | 0.88 |
| 50 g caster sugar (superfine) | ¼ | ¼ | 4.21 | 1.76 |
| 75 g caster sugar (superfine) | ⅜ | ⅜ | 6.32 | 2.65 |
| 100 g caster sugar (superfine) | ½ | ½ | 8.42 | 3.53 |
| 110 g caster sugar (superfine) | ⅝ | ½ | 9.26 | 3.88 |
| 120 g caster sugar (superfine) | ⅝ | ⅝ | 10.11 | 4.23 |
| 125 g caster sugar (superfine) | ⅔ | ⅝ | 10.53 | 4.41 |
| 130 g caster sugar (superfine) | ⅔ | ⅔ | 10.95 | 4.59 |
| 140 g caster sugar (superfine) | ¾ | ⅔ | 11.79 | 4.94 |
| 150 g caster sugar (superfine) | ¾ | ¾ | 12.63 | 5.29 |
| 170 g caster sugar (superfine) | ⅞ | ⅞ | 14.32 | 6.00 |
| 175 g caster sugar (superfine) | ⅞ | ⅞ | 14.74 | 6.17 |
| 200 g caster sugar (superfine) | 1.05 | 1 | 16.84 | 7.05 |
| 225 g caster sugar (superfine) | 1⅛ | 1⅛ | 18.95 | 7.94 |
| 240 g caster sugar (superfine) | 1¼ | 1¼ | 20.21 | 8.47 |
| 250 g caster sugar (superfine) | 1⅓ | 1¼ | 21.05 | 8.82 |
| 275 g caster sugar (superfine) | 1½ | 1⅜ | 23.16 | 9.70 |
| 300 g caster sugar (superfine) | 1⅝ | 1½ | 25.26 | 10.58 |
| 350 g caster sugar (superfine) | 1⅞ | 1¾ | 29.47 | 12.35 |
| 400 g caster sugar (superfine) | 2⅛ | 2 | 33.68 | 14.11 |
| 450 g caster sugar (superfine) | 2⅜ | 2¼ | 37.89 | 15.87 |
| 500 g caster sugar (superfine) | 2⅝ | 2½ | 42.11 | 17.64 |
How to measure caster sugar (superfine) accurately
The 190 g figure assumes the spooned-and-levelled method: spoon the caster sugar (superfine) into a dry measuring cup and sweep the top flat with a straight edge. Scooping the cup through the bag compacts it and gives a heavier cup.
- 1 US cup of caster sugar (superfine) = 190 g
- 1 metric cup (250 ml) of caster sugar (superfine) = 201 g
- ¾ cup = 143 g
- ½ cup = 95 g
- ⅓ cup = 63 g
- ¼ cup = 48 g
- 1 tablespoon = 11.9 g
Frequently asked questions
How many cups is 100 grams of caster sugar (superfine)?
100 grams of caster sugar (superfine) is about ½ US cups, based on 190 g per cup, or ½ metric cups.
How many grams in a cup of caster sugar (superfine)?
One US cup of caster sugar (superfine) weighs 190 grams. A 250 ml metric cup holds 201 grams.
How many cups is 250 grams of caster sugar (superfine)?
250 grams of caster sugar (superfine) is about 1⅓ US cups, or 1¼ metric cups.
Does a UK cup of caster sugar (superfine) weigh the same as a US cup?
No. A UK, Australian or Canadian metric cup is 250 ml against the US 236.6 ml, so it holds about 5.7% more — 201 g of caster sugar (superfine) rather than 190 g.
How many tablespoons is 100 grams of caster sugar (superfine)?
100 grams of caster sugar (superfine) is about 8.42 tablespoons.
Related reading: Cups to Grams.