Kitchen Density Converter
Cornstarch: Cups to Grams Conversion
Exact weight conversions, volume-to-mass ratios, and baking guidelines for cornstarch.
One US customary cup of Cornstarch weighs approximately 128 grams (or 4.5 oz) when using the professional spoon-and-level measurement method. One level tablespoon weighs 8 grams.
Convert Cornstarch Volume to Weight
Cornstarch Measurement Chart
Complete volumetric to gravimetric equivalent table for common baking measurements.
| Volume (US Cups) | Grams (g) | Ounces (oz) | Equivalent Tablespoons |
|---|---|---|---|
| 1/8 cup (2 tbsp) | 16 g | 0.56 oz | 2 tbsp |
| 1/4 cup (4 tbsp) | 32 g | 1.13 oz | 4 tbsp |
| 1/3 cup (5 tbsp + 1 tsp) | 42.7 g | 1.51 oz | 5.3 tbsp |
| 1/2 cup (8 tbsp) | 64 g | 2.26 oz | 8 tbsp |
| 2/3 cup | 85.3 g | 3.01 oz | 10.7 tbsp |
| 3/4 cup (12 tbsp) | 96 g | 3.39 oz | 12 tbsp |
| 1 cup (16 tbsp) | 128 g | 4.52 oz | 16 tbsp |
| 1 1/2 cups | 192 g | 6.77 oz | 24 tbsp |
| 2 cups | 256 g | 9.03 oz | 32 tbsp |
| 3 cups | 384 g | 13.55 oz | 48 tbsp |
How to Measure Cornstarch Accurately
Cornstarch packs and clumps more than any flour, so stir it with a spoon, sprinkle it into the cup and level off without shaking or tapping. An unstirred, dipped cup can hold 160 g instead of 128 g — the difference between a silky custard and a sliceable pudding. Sift before use if the box has been sitting.
Storing Cornstarch & Common Substitutes
Storage
Keeps indefinitely in a sealed box in a dry cupboard. Its only real enemy is moisture: a humid spoon dipped in the box hardens the whole surface into a crust. If lumps form, they are pure moisture — sift them out, not shake them in.
Substitutions
Arrowroot powder and potato starch substitute 1:1 by volume, but both thin out if boiled long, so add them at the end of cooking. Use 2 tablespoons of all-purpose flour where 1 tablespoon of cornstarch is called for in a slurry.
Frequently Asked Questions
How many grams is 1 cup of cornstarch?
One US cup of cornstarch weighs approximately 128 grams (4.5 ounces) using the standard spoon-and-level measurement method.
How many tablespoons is 1 cup of cornstarch?
There are 16 level tablespoons in 1 US cup of cornstarch, with each tablespoon weighing approximately 8 grams.
How many cups is 100 grams of cornstarch?
100 grams of cornstarch is equal to approximately 0.78 US cups.
What is the correct way to measure cornstarch?
Cornstarch packs and clumps more than any flour, so stir it with a spoon, sprinkle it into the cup and level off without shaking or tapping. An unstirred, dipped cup can hold 160 g instead of 128 g — the difference between a silky custard and a sliceable pudding. Sift before use if the box has been sitting.
What can I substitute for cornstarch?
Arrowroot powder and potato starch substitute 1:1 by volume, but both thin out if boiled long, so add them at the end of cooking. Use 2 tablespoons of all-purpose flour where 1 tablespoon of cornstarch is called for in a slurry.