One and a Half Cups of Caster Sugar in Grams
1 1/2 cups of caster sugar weighs 315g (11.11 oz, 360ml) according to USDA FoodData Central (1 cup caster sugar = 210g, spooned and leveled method). 1 1/2 cups = 1.5 of a full cup (240ml). See the full conversion table below for all amounts from 1 tablespoon to 3 cups.
Caster Sugar Cup-to-Gram Conversion Table
Full range from 1 tablespoon to 3 cups. The highlighted row shows 1 1/2 cups.
| Amount | Grams |
|---|---|
| 1 tbsp | 13.13g |
| 2 tbsp | 26.25g |
| 1/8 cup | 26.25g |
| 1/4 cup | 52.5g |
| 1/3 cup | 70g |
| 1/2 cup | 105g |
| 2/3 cup | 140g |
| 3/4 cup | 157.5g |
| 1 cup | 210g |
| 1 1/4 cups | 262.5g |
| 1 1/2 cupsthis page | 315g |
| 1 3/4 cups | 367.5g |
| 2 cups | 420g |
| 2 1/2 cups | 525g |
| 3 cups | 630g |
Source: USDA FoodData Central (FDC ID: 19335). 1 US cup = 240ml. Values use spooned-and-leveled method.
1½ Cups of Different Ingredients — Weight Comparison
1 1/2 cups of different ingredients varies widely in weight because each has a different density. This matters when substituting ingredients in recipes.
| Ingredient | 1½ Cups (g) |
|---|---|
| Powdered Sugar | 180g |
| Granulated Sugar | 300g |
| Caster Sugarcurrent | 315g |
| Brown Sugar (packed) | 330g |
All values use USDA FoodData Central spooned-and-leveled method. Click any ingredient to see its full conversion table.
Measuring Caster Sugar Accurately
Why weight matters: 1 1/2 cups of caster sugar can weigh anywhere from 268g to 378g depending on how you measure it. The USDA standard is 315g (spooned and leveled). Scooping directly from the container can add 10–20% extra weight, which affects recipe results — especially in baking.
About caster sugar density: Caster sugar (superfine sugar) has finer crystals than regular granulated sugar. 1 cup = 210g. Dissolves faster than regular sugar — ideal for meringues, mousses, cold drinks. Common in UK/Australian recipes.
About 1½ Cups as a Measurement
1 1/2 cups = 24 tablespoons = 360ml. This is the standard flour amount for a dozen standard-size cookies or a single-layer 8-inch cake. It bridges the gap between single-cup and double-cup recipe scales.
One and a half cups appears most often in cookie dough recipes (flour), quick bread recipes (oats or mix-ins), and pasta sauce recipes (liquid ingredients). It equals 360ml or 12 fluid ounces.
Frequently Asked Questions
How many grams is 1 1/2 cups of caster sugar?
1 1/2 cups of caster sugar weighs 315 grams (11.11 oz, 360ml). Based on USDA FoodData Central: 1 cup caster sugar = 210g, so 1 1/2 cups = 210 × 1.500 = 315g.
Is 1 1/2 cups of caster sugar the same weight every time?
The weight can vary slightly depending on measuring technique. Spooned and leveled gives 315g. Scooped (packed) can be 10–20% heavier. Sifted gives a lighter weight. The USDA standard (spooned and leveled) of 315g is the most reliable baseline for recipes.
How do I accurately measure 1 1/2 cups of caster sugar?
For accuracy, use a kitchen scale and weigh 315g of caster sugar. If using measuring cups, spoon the caster sugar lightly into a 1½ Cups measuring cup and level off the top with a straight edge. Avoid scooping directly from the container, which compacts the ingredient and adds extra weight.
How does 1 1/2 cups of caster sugar compare to other ingredients?
1 1/2 cups of different ingredients varies significantly: Powdered Sugar = 180g, Granulated Sugar = 300g, Caster Sugar = 315g. This is because each ingredient has a different density.