Convert Caster Sugar from Teaspoon to Cup

How many cups is 1 teaspoon of caster sugar?

1 teaspoon of caster sugar (castor sugar) is 0.02 cups. 2 teaspoons of caster sugar is 0.04 cups. 1/2 teaspoon of caster sugar is 0.01 cups. 1/4 teaspoon (0.25 teaspoon) of caster sugar is 0.01 cups. Use the converter below for any amount.

  • These figures use the metric cup (250 ml). A US cup is slightly smaller at 240 ml, so it holds a little less. Use the US 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 teaspoon of sugar is in cups.

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 teaspoon of raw sugar is in cups.

Out of caster sugar? See caster sugar substitutes →

No measuring spoons? The tool below gets you close, and a measuring spoon set keeps small amounts accurate.

Nail small amounts, get spoons

Caster Sugar Measurement Converter

Enter a value and pick your units.

Result

0.02 Cup

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 teaspoons to cups.

TeaspoonsCups
0.25 tsp0.01 cups
0.5 tsp0.01 cups
1 tsp0.02 cups
2 tsp0.04 cups
3 tsp0.06 cups
4 tsp0.08 cups
6 tsp0.12 cups
8 tsp0.16 cups
12 tsp0.24 cups

Caster Sugar Conversion Chart

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

tspcupgramsounceslbkgcup(US)tbsp
1 tsp0.02 cup4.5 g0.16 oz0.01 lb0 kg0.02 cup (US)0.33 tbsp
2 tsp0.04 cup9 g0.32 oz0.02 lb0.01 kg0.04 cup (US)0.67 tbsp
3 tsp0.06 cup13.5 g0.48 oz0.03 lb0.01 kg0.06 cup (US)1 tbsp
4 tsp0.08 cup18 g0.64 oz0.04 lb0.02 kg0.08 cup (US)1.33 tbsp

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

Frequently Asked Questions

What is 1 teaspoon of caster sugar in cups?
1 teaspoon of caster sugar is 0.02 cups. The ratio is fixed, so 2 teaspoons of caster sugar is 0.04 cups and 0.5 teaspoons is 0.01 cups. 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 cups is 1.5 teaspoons of caster sugar?
1.5 teaspoons of caster sugar is 0.03 cups. The ratio is fixed, so 1 teaspoon of caster sugar is 0.02 cups and 2 teaspoons is 0.04 cups. Type any other amount into the converter above for the exact figure, or use the chart below for the common ones.
What is 2 teaspoons of caster sugar in cups?
2 teaspoons of caster sugar is 0.04 cups. Conversions scale in a straight line, so halving or doubling a recipe keeps the same ratio. 1 teaspoon of caster sugar is 0.02 cups, and you can multiply or divide that figure to match whatever your recipe needs. Enter any amount in the converter above for an exact cups reading.
How many teaspoons of caster sugar is 0.02 cups?
0.02 cups of caster sugar is 1 teaspoon. The conversion works the same in reverse, so you can switch between cups and teaspoons without changing the result. This helps when a recipe lists teaspoons but you would rather weigh or measure in cups. The converter above and the chart below cover both directions for any amount.
How much is 1 teaspoon of castor sugar in cups?
Castor sugar is another name for caster sugar, so 1 teaspoon of castor sugar is 0.02 cups, exactly the same as caster sugar. The figure does not change with the name: 2 teaspoons is 0.04 cups and 0.5 teaspoons is 0.01 cups. Use the converter above for any quantity, or read the conversion chart on this page for the most common amounts.
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 teaspoon of caster sugar is 0.02 cups under either name, and 2 teaspoons is 0.04 cups. Recipes use the two names interchangeably, so you can follow either one without changing quantities or weighing any differently.
What is 1/2 tsp caster sugar in cups?
1/2 teaspoon of caster sugar is 0.01 cups. The ratio is fixed, so 1 teaspoon of caster sugar is 0.02 cups and 2 teaspoons is 0.04 cups. 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 tsp caster sugar in cups?
1/4 teaspoon (0.25 teaspoon) of caster sugar is 0.01 cups. The ratio is fixed, so 1 teaspoon of caster sugar is 0.02 cups and 2 teaspoons is 0.04 cups. 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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