Measure well. Cook your way.

Cornstarch

One US cup of cornstarch is estimated at 112 grams using our reference. How you fill the cup matters.

Reference ingredient

112 g per US cup

Cornstarch · Dry cornstarch, levelled; not coarse cornmeal

Your kitchen converter

Ingredient

Dry cornstarch, levelled; not coarse cornmeal

Amount

From

Decimals and fractions welcome: 0.5, ½ or 1 1/2.

Convert to

Your ingredient estimate

50 grams of cornstarch is about

0.45

US cups

Approximate recipe equivalent for Cornstarch. Ingredient preparation and measuring technique affect the result.

Reference: 112 g per 236.5882 ml US reference cup. More precision: 0.4464 US cups.

See calculation method

Clear measurement standards
Ingredient-aware results
No sign-up needed

Volume depends on the ingredient and the measuring method. Results crossing weight and volume are recipe estimates.

Cornstarch conversions at a glance

Reference: 112 grams per US cup, dry cornstarch, levelled; not coarse cornmeal. Values are approximate.

Grams of cornstarch to US cups
Cornstarch weight	US cups	Kitchen measure
30 g	0.27	a little over ¼ cup
50 g	0.45	a little under ½ cup
100 g	0.89	about 0.89 cups
120 g	1.07	a little under 1 ⅛ cups
150 g	1.34	a little over 1 ⅓ cups
200 g	1.79	a little over 1 ¾ cups
250 g	2.23	a little under 2 ¼ cups

Cups of cornstarch to grams
Cups	US cup (236.59 ml) → g	Metric cup (250 ml) → g
0.25 cups	28	29.59
0.3333 cups	37.33	39.45
0.5 cups	56	59.17
0.6667 cups	74.67	78.9
0.75 cups	84	88.76
1 cup	112	118.35
2 cups	224	236.7

Spoons of cornstarch to grams by system
Spoon	US (14.79 / 4.93 ml)	Metric (15 / 5 ml)	Australian (20 / 5 ml)
1 tbsp	7	7.1	9.47
1 tsp	2.33	2.37	2.37

Cornstarch amounts people look up

The measures most often searched for this ingredient, converted with the reference above.

Searched cornstarch amounts in grams, US cups and ounces (approximate recipe equivalents)
Amount	Grams	US cups	Ounces (weight)
¼ US cup	28 g	0.25 US cups	0.9877 oz
⅓ US cup	37.3333 g	0.3333 US cups	1.3169 oz
10 grams	10 g	0.0893 US cups	0.3527 oz
20 grams	20 g	0.1786 US cups	0.7055 oz
25 grams	25 g	0.2232 US cups	0.8818 oz
50 grams	50 g	0.4464 US cups	1.7637 oz
60 grams	60 g	0.5357 US cups	2.1164 oz

A bowl of flour with a measuring spoon and a jug of milk

Your recipe. Your measuring method.

Spoon, level, then cook.

A light, level cup gives a different weight from a firmly packed scoop. A kitchen scale helps keep the amount repeatable.

How to measure ingredients

How to convert cornstarch

Our reference is 112 grams per US reference cup of cornstarch, dry cornstarch, levelled; not coarse cornmeal. That works out to about 0.4734 grams per millilitre, so cups = grams ÷ 112 and grams = cups × 112 in US customary measures.

For metric and Australian recipes the cup holds 250 ml, so one cup of cornstarch is about 118.35 grams. Australian tablespoons hold 20 ml rather than 15 ml, which the calculator handles when you pick that system.

Preparation changes the weight

The reference describes cornstarch as: dry cornstarch, levelled; not coarse cornmeal. A different form, such as sifted, packed, melted, chopped or cooked, can hold a different weight in the same cup and needs its own reference. When a recipe gives a gram amount, weigh that amount instead of converting.

Brand, moisture and how firmly the cup is filled all move the practical result. Treat the numbers here as recipe equivalents, not laboratory densities.

Where the number comes from

The reference comes from King Arthur Baking ingredient weight chart, which lists 1/4 cup as 28 grams. Published recipe weight, normalised to one reference cup. This site assigns the published cup weight to its adopted US reference cup of 236.5882365 ml; the source itself does not define an exact millilitre cup volume. Checked September 25, 2026.

A few useful answers

Kitchen questions, answered.

How many grams are in a cup of cornstarch?

About 112 grams per US customary cup (dry cornstarch, levelled; not coarse cornmeal), or about 118.35 grams per 250 ml metric cup, using our reference.

How many cups are 100 grams of cornstarch?

About 0.89 US cups. Use the calculator for any other amount or cup system.

Can I substitute a similar ingredient?

A measurement conversion does not establish a recipe substitution. Two ingredients can weigh the same per cup and still behave differently in a recipe; follow the recipe author's substitution guidance.

Sources behind the numbers

Sources checked September 25, 2026. Ingredient values are recipe equivalents, not laboratory densities.