Convert Caster Sugar from Ounces to Teaspoon

How many teaspoons is 1 ounce of caster sugar?

1 ounce of caster sugar (castor sugar) is 6.3 teaspoons. 2 ounces of caster sugar is 12.59 teaspoons. 4 ounces of caster sugar is 25.19 teaspoons. 6 ounces of caster sugar is 37.78 teaspoons. 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 what 1 ounce 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 ounce of raw sugar is in teaspoons.

Out of caster sugar? See caster sugar substitutes →

No scale? The tool below gives a good estimate, but for exact bakes a digital kitchen scale removes the guesswork.

Weigh it exact, get a scale

Caster Sugar Measurement Converter

Enter a value and pick your units.

Result

6.3 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 ounces to teaspoons.

OuncesTeaspoons
1 oz6.3 tsp
2 oz12.59 tsp
3 oz18.89 tsp
4 oz25.19 tsp
5 oz31.49 tsp
6 oz37.78 tsp
8 oz50.38 tsp
10 oz62.97 tsp
12 oz75.57 tsp

Caster Sugar Conversion Chart

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

ouncestspcupgramslbkgcup(US)tbsp
2.5 oz15.74 tsp0.31 cup70.84 g0.16 lb0.07 kg0.33 cup (US)5.25 tbsp
5 oz31.49 tsp0.63 cup141.69 g0.31 lb0.14 kg0.66 cup (US)10.5 tbsp
7.5 oz47.23 tsp0.94 cup212.53 g0.47 lb0.21 kg0.98 cup (US)15.74 tbsp
10 oz62.97 tsp1.26 cup283.38 g0.62 lb0.28 kg1.31 cup (US)20.99 tbsp

For the reverse conversion, see 1 teaspoon of caster sugar in ounces.

Frequently Asked Questions

How many teaspoons is 1 ounce of caster sugar?
1 ounce of caster sugar is 6.3 teaspoons. The conversion is fixed, so 2 ounces is 12.59 teaspoons and 4 ounces is 25.19 teaspoons. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones. Open the caster sugar converter
How many teaspoons is 2 ounces of caster sugar?
2 ounces of caster sugar is 12.59 teaspoons. The conversion is fixed, so 1 ounce is 6.3 teaspoons and 4 ounces is 25.19 teaspoons. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones.
What is 4 oz caster sugar in teaspoons?
4 ounces of caster sugar is 25.19 teaspoons. The conversion is fixed, so 1 ounce is 6.3 teaspoons and 2 ounces is 12.59 teaspoons. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones.
What is 6 oz caster sugar in teaspoons?
6 ounces of caster sugar is 37.78 teaspoons. The conversion is fixed, so 1 ounce is 6.3 teaspoons and 2 ounces is 12.59 teaspoons. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones.
How much is 1 ounce of castor sugar in teaspoons?
Castor sugar is another name for caster sugar, so 1 ounce of castor sugar is 6.3 teaspoons, exactly the same as caster sugar. The figure does not change with the name: 2 ounces is 12.59 teaspoons and 0.5 ounces is 3.15 teaspoons. 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 ounce of caster sugar is 6.3 teaspoons under either name, and 2 ounces is 12.59 teaspoons. Recipes use the two names interchangeably, so you can follow either one without changing quantities or weighing any differently.

Other Ingredients

If you need help with any other ingredients click below: