One level tablespoon (15 ml) of Cornstarch weighs about 9 g. A teaspoon is around 3 g, a 200 ml cup around 120 g, and an everyday Korean rice spoon holds roughly 6.6 g level.
Starch is slightly heavier than flour. For a slurry, mix it with one to two parts cold water by volume โ adding it straight to hot liquid guarantees lumps.
Starch clumps easily โ fill gently and level.
Conversion table
| Unit | Weight |
|---|---|
| 1 tbsp (15 ml) | 9 g |
| 1 tsp (5 ml) | 3 g |
| 1 cup (200 ml) | 120 g |
| 1 paper cup (180 ml) | 108 g |
| 1 Korean rice spoon | 6.6 g |
Measuring with a rice spoon or paper cup
A recipe tablespoon is 15 ml and a Korean recipe cup is 200 ml, but the spoon in your cutlery drawer holds about 11 ml level and a paper cup holds 180 ml. Measuring with everyday utensils therefore puts in roughly a quarter less than the recipe intends.
Heaping the spoon brings it close to a proper tablespoon. For salt, baking powder and anything else where a small error changes the outcome, use measuring spoons or a scale instead.