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Cornstarch — Cups to Grams

One US cup of cornstarch weighs about 120 grams. That is almost the same as all-purpose flour, at 120 grams per cup. Cornstarch is fine and powdery — stir it before measuring to break up any lumps. Use the converter below to switch cornstarch between cups, grams, ounces, tablespoons and millilitres — or read the full chart underneath.

Also known as cornflour.

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Cornstarch conversion chart

Cornstarch — cups to grams chart
Cups	Grams	Ounces	Tablespoons	Millilitres
⅛ cup	15 g	0.529 oz	2	29.57 ml
¼ cup	30 g	1.06 oz	4	59.15 ml
⅓ cup	40 g	1.41 oz	5.33	78.86 ml
½ cup	60 g	2.12 oz	8	118.3 ml
⅔ cup	80 g	2.82 oz	10.67	157.7 ml
¾ cup	90 g	3.17 oz	12	177.4 ml
1 cup	120 g	4.23 oz	16	236.6 ml
1¼ cups	150 g	5.29 oz	20	295.7 ml
1½ cups	180 g	6.35 oz	24	354.9 ml
2 cups	240 g	8.47 oz	32	473.2 ml
3 cups	360 g	12.7 oz	48	709.8 ml

Grams to cups: cornstarch

Cornstarch — grams to cups chart
Grams	Cups	Ounces	Tablespoons
10 g	0.083	0.353 oz	1.33
25 g	0.208	0.882 oz	3.33
50 g	0.417	1.76 oz	6.67
75 g	0.625	2.65 oz	10
100 g	0.833	3.53 oz	13.33
125 g	1.04	4.41 oz	16.67
150 g	1.25	5.29 oz	20
200 g	1.67	7.05 oz	26.67
250 g	2.08	8.82 oz	33.33
300 g	2.5	10.58 oz	40
400 g	3.33	14.11 oz	53.33
500 g	4.17	17.64 oz	66.67

How to measure cornstarch

Cornstarch is fine and powdery — stir it before measuring to break up any lumps.

Because a cup measures volume rather than weight, the most reliable way to measure cornstarch 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.

No scale yet? You don't need a fancy one; any digital kitchen scale that reads in 1-gram steps does everything on this site. Well-rated kitchen scales on Amazon →

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Substitutes for cornstarch

1 tbsp cornstarch = 2 tbsp all-purpose flour (for thickening sauces) (America's Test Kitchen)
Make a slurry with 2 parts cold water, 1 part flour; whisk smooth before adding to the simmering liquid. Simmer 2–3 minutes longer than usual to cook out the raw flour taste.
1 tsp cornstarch = 1½ tsp arrowroot powder (America's Test Kitchen)
Arrowroot makes a clearer, more translucent thickening than cornstarch — useful for fruit pie glazes and clear sauces. Avoid in dairy-based sauces; arrowroot turns slimy with milk and cream.

See all cornstarch substitutes, ratios and sources →

Compare cornstarch

All-purpose flour vs Cornstarch Arrowroot starch vs Cornstarch

Cornstarch conversions: FAQ

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

A cup measures volume, not weight. Cornstarch is less dense than water (120 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 cornstarch conversions

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

100 g to cups

100 g cornstarch ≈ 0.833 cups

200 g to cups

200 g cornstarch ≈ 1.67 cups

250 g to cups

250 g cornstarch ≈ 2.08 cups

500 g to cups

500 g cornstarch ≈ 4.17 cups

¼ cup to grams

¼ cup cornstarch ≈ 30 g

½ cup to grams

½ cup cornstarch ≈ 60 g

1 cup to grams

1 cup cornstarch ≈ 120 g

2 cups to grams

2 cups cornstarch ≈ 240 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.