How many cups is 100 g of cornstarch?

100 g of cornstarch is about 0.77 cups.

Why isn't 100 g exactly 1 cup?

Because cornstarch isn't the same density as water. A cup holds a fixed volume, and cornstarch weighs more or less than water for that volume.

Grams of cornstarch to cups

Answer

100 g of cornstarch = 0.77 cups

Convert any amount

Amount gram = – cup

Conversion table

Grams	Cups
10 g	0.08 cup
25 g	0.19 cup
50 g	0.39 cup
100 g	0.77 cup
150 g	1.16 cup
200 g	1.54 cup
250 g	1.93 cup
300 g	2.31 cup
500 g	3.86 cup

Based on the US customary cup of 240 ml. A metric cup (250 ml) is about 4% larger.

Handy tools for this

Digital kitchen scale The most accurate way to bake — skip the cup guesswork and weigh straight into the bowl to the nearest gram. Check price → Measuring cups set A sturdy nested set of US cups for recipes written in cups. Cheap, dishwasher-safe and built to last. Check price → Measuring spoons Tablespoon and teaspoon set for small, precise amounts of baking powder, salt and spices. Check price →

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How to measure

Cornstarch is very light and packs easily. Spoon it into the cup and level off — a packed cup can weigh noticeably more and over-thicken a sauce.

Frequently asked questions

How many cups is 100 g of cornstarch?: 100 g of cornstarch is about 0.77 cups.
Why isn't 100 g exactly 1 cup?: Because cornstarch isn't the same density as water. A cup holds a fixed volume, and cornstarch weighs more or less than water for that volume.

Related conversions

Values are approximate — ingredient density varies with brand, humidity and how you measure. For baking, weighing on a scale is always the most reliable method.