Caster Sugar Cups to Grams Converter
Instantly and accurately convert baking measurements between cups and grams. Perfect for following any recipe with absolute precision.
Convert Your Sugar Measurements
Enter your caster (superfine) sugar amount in either cups or grams below. The calculator will instantly compute the equivalent value using the standard baking conversion factor.
Sugar Measurement Converter
Type a value in either field to see the real-time conversion
Use decimals for fractions (e.g., 0.5 for 1/2 cup)
Weight in grams (recommended for baking)
Conversion Result
Based on standard density: 1 cup = 200g
Enter a value in either the Cups or Grams field to see your instant conversion result and breakdown.
Common Caster Sugar Conversions
Handy reference chart for common baking measurements. Based on the standard metric conversion of 1 cup = 200 grams of caster sugar.
| Cups (Volume) | Grams (Weight) | Common Baking Use |
|---|---|---|
| 1/8 cup | 25 g | Small batch cookies, dusting |
| 1/4 cup | 50 g | Light sweetening, meringues |
| 1/3 cup | 67 g | Small cakes, syrups |
| 1/2 cup | 100 g | Standard muffin or cupcake batch |
| 3/4 cup | 150 g | Medium sponge cakes |
| 1 cup | 200 g | Standard Victoria sponge, brownies |
| 1.5 cups | 300 g | Larger cakes, sweet doughs |
| 2 cups | 400 g | Large batch baking, frosting |
Baking Measurement FAQ
Everything you need to know about measuring caster sugar, substitutions, and achieving perfect baking results.
One standard metric cup of caster (superfine) sugar weighs approximately 200 grams. This is the widely accepted standard for baking conversions in the UK, Australia, and New Zealand, and is nearly identical to the US customary cup weight.
Caster sugar (also known as superfine sugar) has a finer grain than regular granulated sugar. This allows it to dissolve much faster, making it ideal for meringues, syrups, and delicate cakes. By weight, they are identical (1:1), but by volume, caster sugar can pack slightly more densely.
It is highly recommended to measure sugar by grams (weight) rather than cups (volume) for baking. Weight measurements are significantly more accurate, eliminate inconsistencies caused by how tightly the sugar is packed or settled in the bag, and ensure your recipes turn out perfectly every time.
Yes, you can substitute them in a 1:1 ratio by weight. If a recipe calls for granulated sugar by volume (cups), you can usually substitute caster sugar cup-for-cup, though the finer texture may cause baked goods to spread slightly more or dissolve faster, which is often a desirable trait.