Convert Caster Sugar from Cup

How much is 1 cup of caster sugar?

1 cup of caster sugar (castor sugar) is 225 grams, about 7.94 ounces. 0.5 cups of caster sugar is 112.5 grams and 2 cups is 450 grams. Use the converter below for any amount.

Caster sugar, also known as superfine or castor sugar, is a key ingredient in many baking recipes due to its fine texture and quick-dissolving properties. Commonly used in cakes, meringues, and desserts, it sits between granulated sugar and powdered sugar in terms of texture. One metric cup (250 ml) of caster sugar weighs around 225 grams or 7.94 ounces.

Since baking is a precise science, even small differences in sugar quantity can affect the final outcome, from texture and sweetness to structure. This page helps you convert caster sugar between grams, cups, tablespoons, and more so that you can follow any recipe confidently, no matter what measurement system it uses.

Also known as

  • castor sugar
  • Superfine Sugar
  • Baker's Sugar
  • Bar Sugar

Standard granulated sugar has larger crystals than caster sugar, so it dissolves more slowly in batters and meringues. They are close in weight (200 g vs 225 g per cup) and swap 1:1 by volume in most recipes, though caster gives a smoother result. See our Sugar converter.

Raw sugar has large, coarse crystals that dissolve slowly, the opposite of fine caster sugar. It packs lighter (200 g vs 225 g per cup), so it is not a 1:1 swap by volume; weigh when substituting. See our Raw Sugar converter.

Out of caster sugar? See caster sugar substitutes →

No measuring cups? The tool below gets you close, and a measuring cup set keeps every batch the same.

Caster Sugar Measurement Converter

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Common Caster Sugar Conversions

Here are the most common caster sugar conversions from cups to grams.

CupsGrams
0.25 cups56.25 g
0.5 cups112.5 g
0.75 cups168.75 g
1 cup225 g
1.25 cups281.25 g
1.5 cups337.5 g
2 cups450 g
2.5 cups562.5 g
3 cups675 g

Caster Sugar Conversion Chart

The conversion chart below gives a quick reference for converting caster sugar from Cup to other measurements.

cupgramsouncescup(US)tbsptsp
0.25 cup56.25 g1.99 oz0.26 cup (US)4.17 tbsp12.5 tsp
0.5 cup112.5 g3.97 oz0.52 cup (US)8.33 tbsp25 tsp
1 cup225 g7.94 oz1.04 cup (US)16.67 tbsp50 tsp
2 cup450 g15.88 oz2.08 cup (US)33.33 tbsp100 tsp

Frequently Asked Questions

How much is 1 cup of caster sugar?
1 cup of caster sugar is 225 grams, or 7.94 ounces. The ratio is fixed, so 0.5 cups of caster sugar is 112.5 grams and 2 cups is 450 grams. Whatever unit your recipe uses, enter the amount in the converter above or read the conversion chart on this page for the most common quantities. Open the caster sugar converter
How many grams is 1 cup of caster sugar?
1 cup of caster sugar is 225 grams. The conversion scales in a straight line, so 0.5 cups is 112.5 grams and 2 cups is 450 grams. Multiply or divide that figure to match whatever your recipe needs, or use the converter above for an exact grams reading at any amount.
How many cups of caster sugar is 225 grams?
225 grams of caster sugar is 1 cup. The conversion works the same in reverse, so you can switch between cups and grams without changing the result. This helps when a recipe lists one unit but you would rather measure in the other. The converter above and the chart below cover both directions for any amount.

Measurement Options

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Other Ingredients

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