Convert Caster Sugar from Cup (US) to Grams

How many grams is 1 US cup of caster sugar?

1 US cup of caster sugar (castor sugar) is 216 grams. 2 US cups of caster sugar is 432 grams. 1/2 US cup of caster sugar is 108 grams. 1/4 US cup (0.25 US cup) of caster sugar is 54 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 what 1 US cup of sugar is in grams.

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 what 1 US cup of raw sugar is in grams.

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.

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Caster Sugar Measurement Converter

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Result

216 Grams

Common Caster Sugar Conversions

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

Cups (US)Grams
0.25 cups (US)54 g
0.5 cups (US)108 g
0.75 cups (US)162 g
1 cup (US)216 g
1.25 cups (US)270 g
1.5 cups (US)324 g
2 cups (US)432 g
2.5 cups (US)540 g
3 cups (US)648 g

Caster Sugar Conversion Chart

The conversion chart below gives a quick reference for converting caster sugar from Cup (US) to Grams and other measurements.

cup(US)gramscupounceslbkgtbsptsp
0.25 cup (US)54 g0.24 cup1.91 oz0.12 lb0.05 kg4 tbsp12 tsp
0.5 cup (US)108 g0.48 cup3.81 oz0.24 lb0.11 kg8 tbsp24 tsp
1 cup (US)216 g0.96 cup7.62 oz0.48 lb0.22 kg16 tbsp48 tsp
2 cup (US)432 g1.92 cup15.24 oz0.95 lb0.43 kg32 tbsp96 tsp

For cups to grams with a different ingredient, use the cups to grams converter for a quick-reference table.

For the reverse conversion, see 100 grams of caster sugar in US cups.

Frequently Asked Questions

What is 1 US cup of caster sugar in grams?
1 US cup of caster sugar is 216 grams. The ratio is fixed, so 2 US cups of caster sugar is 432 grams and 0.5 US cups is 108 grams. Use the converter above for any quantity, or check the conversion chart on this page for the most common amounts at a glance. Open the caster sugar converter
How many grams is 1.5 US cups of caster sugar?
1.5 US cups of caster sugar is 324 grams. The ratio is fixed, so 1 US cup of caster sugar is 216 grams and 2 US cups is 432 grams. Type any other amount into the converter above for the exact figure, or use the chart below for the common ones.
What is 2 US cups of caster sugar in grams?
2 US cups of caster sugar is 432 grams. Conversions scale in a straight line, so halving or doubling a recipe keeps the same ratio. 1 US cup of caster sugar is 216 grams, and you can multiply or divide that figure to match whatever your recipe needs. Enter any amount in the converter above for an exact grams reading.
How many US cups of caster sugar is 216 grams?
216 grams of caster sugar is 1 US cup. The conversion works the same in reverse, so you can switch between grams and US cups without changing the result. This helps when a recipe lists US cups but you would rather weigh or measure in grams. The converter above and the chart below cover both directions for any amount.
Are caster sugar and castor sugar the same thing?
Yes. Castor sugar is another name for caster sugar, so they are the same ingredient and convert identically. 1 US cup of caster sugar is 216 grams under either name, and 2 US cups is 432 grams. Recipes use the two names interchangeably, so you can follow either one without changing quantities or weighing any differently.
What is 1/2 cup (US) caster sugar in grams?
1/2 US cup of caster sugar is 108 grams. The ratio is fixed, so 1 US cup of caster sugar is 216 grams and 2 US cups is 432 grams. Half measures come up often when scaling a recipe down, and the figure divides cleanly. Use the converter above for any other amount, or the chart below for the common ones.
What is 1/4 cup (US) caster sugar in grams?
1/4 US cup (0.25 US cup) of caster sugar is 54 grams. The ratio is fixed, so 1 US cup of caster sugar is 216 grams and 2 US cups is 432 grams. Quarter amounts often come up when scaling a recipe down step by step, and the figure divides cleanly. Use the converter above for any other quantity, or the chart below for the most common amounts.
Is 1 cup of caster sugar 225 or 216 grams?
A cup of caster sugar weighs 225 grams in a metric cup (250 ml) and about 216 grams in a US cup (240 ml), since the metric cup holds a little more. Most US recipes mean the US cup, while UK, Australian, and European recipes use the metric cup. The difference is small but worth checking when a recipe is precise. Weigh on a scale for the most reliable result.

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