Caster / Superfine Sugar — Grams ↔ Cups Converter
1 US Customary cup (236.6 mL) of caster / superfine sugar weighs 225 grams (7.94 ounces or 14.1g per tablespoon) when measured poured & leveled; 1 Metric cup (250 mL) weighs 237.8g and 100g equals ⅓ cup + 1 tbsp + 2 ¼ tsp for accurate kitchen baking.
Kitchen note: Test-kitchen baseline uses poured & leveled (225g/cup). Switching to spooned into cup (215g/cup) changes each cup by 10g—use the packing toggle on the scale bench to match your recipe.
Caster Sugar: Cups & Spoons to Grams
Based on 225g per 236.6 mL US cup (poured & leveled).
| Volume | Grams | Ounces |
|---|---|---|
| 1 Teaspoon (tsp) | 4.7 g | 0.17 oz |
| 1 Tablespoon (tbsp) | 14.1 g | 0.5 oz |
| ⅛ US Cup (2 tbsp) | 28.1 g | 0.99 oz |
| ¼ US Cup (4 tbsp) | 56.3 g | 1.98 oz |
| ⅓ US Cup | 75 g | 2.65 oz |
| ½ US Cup (8 tbsp) | 112.5 g | 3.97 oz |
| ⅔ US Cup | 150 g | 5.29 oz |
| ¾ US Cup (12 tbsp) | 168.8 g | 5.95 oz |
| 1 US Cup (236.6 mL) | 225 g | 7.94 oz |
| 1 Metric Cup (250 mL) | 237.8 g | 8.39 oz |
| 1 ½ US Cups | 337.5 g | 11.9 oz |
| 2 US Cups | 450 g | 15.87 oz |
| 3 US Cups | 675 g | 23.81 oz |
| 4 US Cups (1 Quart) | 900 g | 31.75 oz |
Caster Sugar: Grams to US Cups
Nearest practical baker cup & spoon breakdown.
| Weight | Kitchen Measure | Decimal |
|---|---|---|
| 10 g | 2 ¼ tsp | 0.04 c |
| 25 g | 1 tbsp + 2 ¼ tsp | 0.11 c |
| 50 g | 3 tbsp + 1 ¾ tsp | 0.22 c |
| 75 g | ⅓ cup | 0.33 c |
| 100 g | ⅓ cup + 1 tbsp + 2 ¼ tsp | 0.44 c |
| 125 g | ½ cup + 2 ¾ tsp | 0.56 c |
| 150 g | ⅔ cup | 0.67 c |
| 200 g | ¾ cup + 2 tbsp + ¾ tsp | 0.89 c |
| 250 g | 1 ⅛ cups | 1.11 c |
| 300 g | 1 ⅓ cups | 1.33 c |
| 400 g | 1 ¾ cups + 1 ¼ tsp | 1.78 c |
| 500 g | 2 cups + 3 tbsp + 1 ¾ tsp | 2.22 c |
| 750 g | 3 ⅓ cups | 3.33 c |
| 1000 g | 4 ⅓ cups + 1 tbsp + 2 ¼ tsp | 4.44 c |
How to Measure Caster / Superfine Sugar Accurately
Pour and level flat. Because the micro-granules pack closer together than regular granulated sugar, 1 cup weighs a dense 225 grams.
Packing Density Comparison (1 US Cup)
- poured & leveled (Test-kitchen standard) 225 g
- Spooned into cup 215 g
Data reference: British Baker standard (225g/cup) & Domino Superfine specifications
Common Culinary Uses
- Delicate French meringues and pavlovas
- Sponge cakes and genoise
- Cocktails and bar syrups
- Sorbet bases
Weight-Aware Substitutions
- Pulse standard granulated sugar in a food processor or spice grinder for 30 seconds to yield superfine crystals
Exact Caster / Superfine Sugar Recipe Conversions
Grams & Ounces to Cups
Caster / Superfine Sugar Measuring FAQs
Why do British and Australian recipes call for caster sugar? ▾
Caster sugar dissolves almost immediately into egg whites and butter, preventing gritty meringues and dry cake crumbs.
Why does a cup of caster sugar weigh 225g while granulated weighs 200g? ▾
Smaller crystal size means tighter packing with significantly less empty airspace between granules.