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 measure identically. A cup of caster sugar weighs 225 grams under either name, and every conversion on this page holds whichever name your recipe uses. Recipes swap the two freely, so you can follow either without changing quantities or weighing any differently.

What is 0.25 cups of caster sugar in tablespoons?

0.25 cups of caster sugar is 4.17 tablespoons. This is the same for any ingredient, since cups and tablespoons are both volume units and do not depend on what you are measuring. One cup is about 16.67 tablespoons, so 0.5 cups is 8.33 tablespoons. Use the volume converter to switch between cups, tablespoons, teaspoons, and millilitres for any amount.

How much does a cup of caster sugar weigh?

1 cup of caster sugar in grams is 225 grams. The ratio is fixed, so 2 cups is 450 grams and half a cup is 112.5 grams. Weighing caster sugar by the cup is the most common way to measure it for baking. See the full cup to grams chart for caster sugar, or use the converter on this page for any other amount.

Convert Caster Sugar measurements

Caster Sugar Measurement Converter

Use the tool below to convert caster sugar from the measurements in your recipe to the measurements that you need.

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

Caster Sugar substitutes

Ran out? What to use instead of caster sugar →

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Caster Sugar Calculators & Baking Tools

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

Jam and Marmalade Calculator Check the sugar a batch of preserve needs and how many jars it fills.
Pan Size Converter Rescale a recipe for a different cake tin size.
Oven to Air Fryer Converter Match the temperature and time when you swap the oven for an air fryer, fan oven, or slow cooker.
Recipe Scaler Scale any recipe up or down and keep every ingredient in ratio.
Volume Converter Switch between cups, tablespoons, teaspoons and millilitres for any ingredient.
Weight Converter Switch between grams, ounces, pounds and kilograms for any ingredient.

Common Caster Sugar Conversions

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

Grams	Cups
50 g	0.22 cups
100 g	0.44 cups
125 g	0.56 cups
150 g	0.67 cups
175 g	0.78 cups
200 g	0.89 cups
225 g	1 cup
250 g	1.11 cups
300 g	1.33 cups
400 g	1.78 cups
450 g	2 cups
500 g	2.22 cups

Caster Sugar Conversion Chart

The conversion chart below gives a quick reference for converting caster sugar to different measurements.

grams	cup	ounces	lb	kg	cup(US)	tbsp	tsp
100 g	0.44 cup	3.53 oz	0.22 lb	0.1 kg	0.46 cup (US)	7.41 tbsp	22.22 tsp
150 g	0.67 cup	5.29 oz	0.33 lb	0.15 kg	0.69 cup (US)	11.11 tbsp	33.33 tsp
250 g	1.11 cup	8.82 oz	0.55 lb	0.25 kg	1.16 cup (US)	18.52 tbsp	55.56 tsp
500 g	2.22 cup	17.64 oz	1.1 lb	0.5 kg	2.31 cup (US)	37.04 tbsp	111.11 tsp
750 g	3.33 cup	26.47 oz	1.65 lb	0.75 kg	3.47 cup (US)	55.56 tbsp	166.67 tsp

Frequently Asked Questions

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 measure identically. A cup of caster sugar weighs 225 grams under either name, and every conversion on this page holds whichever name your recipe uses. Recipes swap the two freely, so you can follow either without changing quantities or weighing any differently.
What is 0.25 cups of caster sugar in tablespoons?: 0.25 cups of caster sugar is 4.17 tablespoons. This is the same for any ingredient, since cups and tablespoons are both volume units and do not depend on what you are measuring. One cup is about 16.67 tablespoons, so 0.5 cups is 8.33 tablespoons. Use the volume converter to switch between cups, tablespoons, teaspoons, and millilitres for any amount. Open the volume converter
How much does a cup of caster sugar weigh?: 1 cup of caster sugar in grams is 225 grams. The ratio is fixed, so 2 cups is 450 grams and half a cup is 112.5 grams. Weighing caster sugar by the cup is the most common way to measure it for baking. See the full cup to grams chart for caster sugar, or use the converter on this page for any other amount. 1 cup caster sugar in grams

Measurement Options

Choose from the following measurements to convert from

Related to Caster Sugar

Sugar

Granulated sugar swaps 1:1 for caster sugar in most recipes, though its larger crystals dissolve more slowly. For meringues or smooth sponges, pulse granulated sugar in a food processor for a few seconds to bring it closer to caster's finer grain. See our Sugar converter.

Icing Sugar

Icing sugar is milled far finer and packs much lighter than caster (125 g vs 225 g per cup), so it is not a 1:1 swap. Use it only where a powder works, such as uncooked frostings and dusting, not for creaming into a cake batter. See our Icing Sugar converter.

Raw Sugar

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 our Raw Sugar converter.

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