Convert Caster Sugar from Teaspoon

How much is 1 teaspoon of caster sugar?

1 teaspoon of caster sugar (castor sugar) is 4.5 grams, about 0.16 ounces. 0.5 teaspoons of caster sugar is 2.25 grams and 2 teaspoons is 9 grams. Use the converter below for any amount.

  • 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 sugar 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 raw sugar in teaspoons.

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

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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 grams.

TeaspoonsGrams
0.25 tsp1.13 g
0.5 tsp2.25 g
1 tsp4.5 g
2 tsp9 g
3 tsp13.5 g
4 tsp18 g
6 tsp27 g
8 tsp36 g
12 tsp54 g

Caster Sugar Conversion Chart

The conversion chart below gives a quick reference for converting caster sugar from Teaspoon to 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

Frequently Asked Questions

How much is 1 teaspoon of caster sugar?
1 teaspoon of caster sugar is 4.5 grams, or 0.16 ounces. The ratio is fixed, so 0.5 teaspoons of caster sugar is 2.25 grams and 2 teaspoons is 9 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 teaspoon of caster sugar?
1 teaspoon of caster sugar is 4.5 grams. The conversion scales in a straight line, so 0.5 teaspoons is 2.25 grams and 2 teaspoons is 9 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. 1 teaspoon caster sugar in grams
How many teaspoons of caster sugar is 4.5 grams?
4.5 grams of caster sugar is 1 teaspoon. The conversion works the same in reverse, so you can switch between teaspoons 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.
What is 1 teaspoon of caster sugar in ounces?
1 teaspoon of caster sugar is 0.16 ounces. The ratio is fixed, so 0.5 teaspoons is 0.08 ounces and 2 teaspoons is 0.32 ounces. Use the converter above for any other amount, or see the chart on this page for the common quantities at a glance. 1 teaspoon caster sugar in ounces
How do teaspoons and cups compare as units?
Teaspoons and cups are both volume units, so the conversion between them does not vary by ingredient. One metric cup holds about 16.67 tablespoons or 50 teaspoons, and the ratio stays fixed regardless of what you are measuring. The volume converter handles any amount between cups, tablespoons, teaspoons, and millilitres. Teaspoons to cups

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Other Ingredients

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