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Caster sugar — Cups to Grams

One US cup of caster sugar weighs about 190 grams. That makes it heavier than all-purpose flour, which is 120 grams per cup. Caster (superfine) sugar has smaller crystals than granulated sugar, so it settles a little lighter. Use the converter below to switch caster sugar between cups, grams, ounces, tablespoons and millilitres — or read the full chart underneath.

Also known as superfine sugar.

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Caster sugar conversion chart

Caster sugar — cups to grams chart
Cups	Grams	Ounces	Tablespoons	Millilitres
⅛ cup	23.75 g	0.838 oz	2	29.57 ml
¼ cup	47.5 g	1.68 oz	4	59.15 ml
⅓ cup	63.33 g	2.23 oz	5.33	78.86 ml
½ cup	95 g	3.35 oz	8	118.3 ml
⅔ cup	126.7 g	4.47 oz	10.67	157.7 ml
¾ cup	142.5 g	5.03 oz	12	177.4 ml
1 cup	190 g	6.7 oz	16	236.6 ml
1¼ cups	237.5 g	8.38 oz	20	295.7 ml
1½ cups	285 g	10.05 oz	24	354.9 ml
2 cups	380 g	13.4 oz	32	473.2 ml
3 cups	570 g	20.11 oz	48	709.8 ml

Grams to cups: caster sugar

Caster sugar — grams to cups chart
Grams	Cups	Ounces	Tablespoons
10 g	0.053	0.353 oz	0.842
25 g	0.132	0.882 oz	2.11
50 g	0.263	1.76 oz	4.21
75 g	0.395	2.65 oz	6.32
100 g	0.526	3.53 oz	8.42
125 g	0.658	4.41 oz	10.53
150 g	0.789	5.29 oz	12.63
200 g	1.05	7.05 oz	16.84
250 g	1.32	8.82 oz	21.05
300 g	1.58	10.58 oz	25.26
400 g	2.11	14.11 oz	33.68
500 g	2.63	17.64 oz	42.11

How to measure caster sugar

Caster (superfine) sugar has smaller crystals than granulated sugar, so it settles a little lighter.

Because a cup measures volume rather than weight, the most reliable way to measure caster sugar is with a digital kitchen scale. If you are working from cups, keep your technique consistent every time so your results are repeatable. For more, see our guide on baking by weight versus volume.

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Substitutes for caster sugar

Blitz granulated sugar in a food processor or blender for 15–30 seconds
Stop when the crystals are noticeably finer but well before they turn powdery. Caster sugar dissolves faster than granulated — useful in meringues, fine cakes, and cold drinks.

See all caster sugar substitutes, ratios and sources →

Caster sugar conversions: FAQ

Why doesn't a cup of caster sugar weigh the same as a cup of water?

A cup measures volume, not weight. Caster sugar is less dense than water (190 g versus 237 g per cup), so the same volume has a different weight. Weighing in grams is the most accurate way to measure it.

Common caster sugar conversions

Quick-answer pages for the conversions people search for most.

100 g to cups

100 g caster sugar ≈ 0.526 cups

200 g to cups

200 g caster sugar ≈ 1.05 cups

250 g to cups

250 g caster sugar ≈ 1.32 cups

500 g to cups

500 g caster sugar ≈ 2.63 cups

¼ cup to grams

¼ cup caster sugar ≈ 47.5 g

½ cup to grams

½ cup caster sugar ≈ 95 g

1 cup to grams

1 cup caster sugar ≈ 190 g

2 cups to grams

2 cups caster sugar ≈ 380 g

Related converters

← All ingredient converters Cups to grams chart Recipe scaler

* Conversion figures are typical average weights for one US customary cup (236.6 ml), based on the King Arthur Baking Ingredient Weight Chart and cross-referenced with the U.S. Department of Agriculture FoodData Central database. Actual weight varies with packing, brand and humidity — see our methodology.