Gram to Cup

70 grams of cornstarch to cups

70 g of cornstarch is about 0.55 cups, which is roughly 1/2 cup or 8.75 tablespoons. That comes from 128 g per US cup. Spooned and levelled. Sits between flour and sugar in density.

Measure70 g of cornstarch
Cups0.55
Kitchen measure1/2 cup
Tablespoons8.75
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 70 g of cornstarch?
0.55 cups, or about 1/2 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 70 g of cornstarch?
About 8.75 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 70 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 70 g of cornstarch is 0.55 cups at 128 g per cup, while the same 70 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of cornstarch

40 g45 g50 g60 g74 g75 g80 g85 g90 g100 g

See all cornstarch conversions or 70 g of every other ingredient.