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

Standard granulated sugar has larger crystals than caster sugar, so it dissolves more slowly in batters and meringues. They are close in weight (201 g vs 225 g per cup) and swap 1:1 by volume in most recipes, though caster gives a smoother result. See our Sugar converter.

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.

Out of caster sugar? See caster sugar substitutes →

Baking a cake? The tool below sorts your measurements. To mix the batter, a hand mixer does the heavy lifting.

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Common Caster Sugar Conversions

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

Grams	Cups
25 g	0.11 cups
50 g	0.22 cups
75 g	0.33 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
250 g	1.11 cups
300 g	1.33 cups
400 g	1.78 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	cup(US)	tbsp	tsp
100 g	0.44 cup	3.53 oz	0.46 cup (US)	7.41 tbsp	22.22 tsp
150 g	0.67 cup	5.29 oz	0.69 cup (US)	11.11 tbsp	33.33 tsp
250 g	1.11 cup	8.82 oz	1.16 cup (US)	18.52 tbsp	55.56 tsp
500 g	2.22 cup	17.64 oz	2.31 cup (US)	37.04 tbsp	111.11 tsp
750 g	3.33 cup	26.47 oz	3.47 cup (US)	55.56 tbsp	166.67 tsp

Measurement Options

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Other Ingredients

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