Cornstarch: US Cups & tbsp to Grams (g) & Ounces (oz) Conversion
Convert volumes of cornstarch (known as cornflour in the UK, Ireland, Australia, and New Zealand) measured in US cups and tablespoons (tbsp) to its approximate weight in metric grams (g) and imperial/US ounces (oz).
US Volume (Cornstarch)
Grams (g) (approx.)
Ounces (oz) (approx. by weight)
1 teaspoon (tsp)
2.5-3 g
0.09-0.11 oz
1 tablespoon (tbsp)
7.5-9 g (often ~8g)
0.26-0.32 oz
2 tablespoons (1/8 cup)
15-18 g
0.53-0.63 oz
1/4 cup
30-35 g
1.06-1.23 oz
1/3 cup
40-47 g
1.41-1.66 oz
1/2 cup
60-70 g
2.12-2.47 oz
1 cup
120-140 g (often ~125g or 128g)
4.23-4.94 oz
Important Considerations for Cornstarch:
Cornstarch is a fine powder and its weight per volume can vary depending on how it's packed. A common average is **around 125-128 grams per US cup** (approximately 4.4-4.5 ounces) when spooned and leveled.
Do not pack cornstarch into the measuring cup unless specified by the recipe. Use the "spoon and level" method.
Cornstarch is primarily used as a thickening agent in sauces, gravies, and custards, and in some baked goods.
For recipes where the thickening power is critical, measuring by weight with a kitchen scale ensures consistency.
"Cornflour" in the UK and other regions refers to what is known as cornstarch in the US.