A recipe calls for 2 tablespoons of cornstarch — how many grams is that?

2 tablespoons × 7.5 g ≈ 15 g. For thickening sauces, this small amount makes a noticeable difference, so measuring accurately matters more than it might seem for such a small quantity.

Can I substitute cornstarch for flour as a thickener using the same gram weight?

Not at the same weight — cornstarch has roughly twice the thickening power of flour, so use about half the weight of cornstarch compared to flour (e.g., 15 g cornstarch instead of 30 g flour) for a similar thickening effect.

Cornstarch: Cups to Grams Converter

Convert cornstarch between cups, tablespoons, teaspoons, milliliters, grams, and ounces.

Ingredient

Amount

From

Cornstarch: 120 Grams

Cornstarch is a very fine powder that measures similarly to flour by volume — about 120 g per cup — and is used in small quantities as a thickener, so most recipes call for tablespoons or teaspoons rather than full cups. Like flour, it can compact if scooped directly from the container, so spooning it into the measuring spoon and leveling gives a more accurate result.

Common Amounts

Cornstarch cups to grams
Cups	Grams
1/4 cups	30 g
1/3 cups	40 g
1/2 cups	60 g
3/4 cups	90 g
1 cup	120 g
2 cups	240 g

Frequently Asked Questions

Last reviewed: 2026-06-11 · Source: USDA FoodData Central / King Arthur Baking ingredient weight charts · see our methodology

All-Purpose Flour cups to grams Bread Flour cups to grams Whole Wheat Flour cups to grams Granulated Sugar cups to grams Brown Sugar (packed) cups to grams Powdered Sugar cups to grams Butter cups to grams Honey cups to grams

Cornstarch: Cups to Grams Converter

Common Amounts

Frequently Asked Questions

Related Converters