Gram to Cup

80 grams of cornstarch to cups

80 g of cornstarch is about 0.63 cups, which is roughly 5/8 cup or 10 tablespoons. That comes from 128 g per US cup. Spooned and levelled. Sits between flour and sugar in density.

Measure80 g of cornstarch
Cups0.63
Kitchen measure5/8 cup
Tablespoons10
Grams per cup used128 g

Cornstarch weighs about 128 g a cup spooned and levelled, though most recipes only ever ask for a tablespoon or two. One level tablespoon is about 8 g, which is the number that matters for thickening sauces and fruit fillings.

Result
0.83 cups
About 7/8 cup of all-purpose flour. 100 g is 3.53 oz by weight.
Assumes spoon-and-level. Scooped flour runs closer to 140 g a cup.

Questions

How many cups is 80 g of cornstarch?
0.63 cups, or about 5/8 cup. That is worked out at 128 g per US cup, and a cup of cornstarch can run 120 to 130 g depending on settling.
How many tablespoons is 80 g of cornstarch?
About 10 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 80 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 80 g of cornstarch is 0.63 cups at 128 g per cup, while the same 80 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of cornstarch

50 g60 g70 g74 g75 g85 g90 g100 g110 g112 g

See all cornstarch conversions or 80 g of every other ingredient.