Convert Caster Sugar from Cup (US) to Teaspoon

How many teaspoons is 1 US cup of caster sugar?

1 US cup of caster sugar (castor sugar) is 48 teaspoons. 2 US cups of caster sugar is 96 teaspoons. 1/2 US cup of caster sugar is 24 teaspoons. 1/4 US cup (0.25 US cup) of caster sugar is 12 teaspoons. Use the converter below for any amount.

  • These figures use the US cup (240 ml). A metric cup is slightly larger at 250 ml, so it holds a little more. Use the metric cup converter →
  • Cup sizes are not standard worldwide, so the same cup of an ingredient can weigh more or less depending on the country. What is a cup measurement →
  • A teaspoon here is the 5 ml standard, the same in the UK, Europe, and Australia. A US teaspoon is fractionally smaller at about 4.9 ml. When teaspoon size matters →
  • A little over or under won't ruin the bake. An extra spoon mainly makes it sweeter.

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

Related Caster Sugar Ingredients

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 teaspoons.

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 teaspoons.

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

Enter a value and pick your units.

Result

48 Teaspoon

Caster Sugar Calculators & Baking Tools

Working with caster sugar? These tools handle the jobs a converter cannot.

Common Caster Sugar Conversions

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

Cups (US)Teaspoons
0.25 cups (US)12 tsp
0.5 cups (US)24 tsp
0.75 cups (US)36 tsp
1 cup (US)48 tsp
1.25 cups (US)60 tsp
1.5 cups (US)72 tsp
2 cups (US)96 tsp
2.5 cups (US)120 tsp
3 cups (US)144 tsp

Caster Sugar Conversion Chart

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

cup(US)tspcupgramsounceslbkgtbsp
0.25 cup (US)12 tsp0.24 cup54 g1.91 oz0.12 lb0.05 kg4 tbsp
0.5 cup (US)24 tsp0.48 cup108 g3.81 oz0.24 lb0.11 kg8 tbsp
1 cup (US)48 tsp0.96 cup216 g7.62 oz0.48 lb0.22 kg16 tbsp
2 cup (US)96 tsp1.92 cup432 g15.24 oz0.95 lb0.43 kg32 tbsp

This is a volume conversion, so the result is the same for every ingredient. Use the cups (US) to teaspoons volume converter to switch between cups, tablespoons, teaspoons, and millilitres without weighing.

Frequently Asked Questions

What is 1 US cup of caster sugar in teaspoons?
1 US cup of caster sugar is 48 teaspoons. The ratio is fixed, so 2 US cups of caster sugar is 96 teaspoons and 0.5 US cups is 24 teaspoons. 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 teaspoons is 1.5 US cups of caster sugar?
1.5 US cups of caster sugar is 72 teaspoons. The ratio is fixed, so 1 US cup of caster sugar is 48 teaspoons and 2 US cups is 96 teaspoons. 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 teaspoons?
2 US cups of caster sugar is 96 teaspoons. Conversions scale in a straight line, so halving or doubling a recipe keeps the same ratio. 1 US cup of caster sugar is 48 teaspoons, and you can multiply or divide that figure to match whatever your recipe needs. Enter any amount in the converter above for an exact teaspoons reading.
How many US cups of caster sugar is 48 teaspoons?
48 teaspoons of caster sugar is 1 US cup. The conversion works the same in reverse, so you can switch between teaspoons and US cups without changing the result. This helps when a recipe lists US cups but you would rather weigh or measure in teaspoons. 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 48 teaspoons under either name, and 2 US cups is 96 teaspoons. 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 teaspoons?
1/2 US cup of caster sugar is 24 teaspoons. The ratio is fixed, so 1 US cup of caster sugar is 48 teaspoons and 2 US cups is 96 teaspoons. 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 teaspoons?
1/4 US cup (0.25 US cup) of caster sugar is 12 teaspoons. The ratio is fixed, so 1 US cup of caster sugar is 48 teaspoons and 2 US cups is 96 teaspoons. 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.

Other Ingredients

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