How Many Grams in 4 Cups of Cornstarch?
Precise conversion for baking and cooking.
The exact weight is
512
grams
4 cups of cornstarch = 512g
· Based on 128g per cup
🔢 Quick Calculator
cups of cornstarch =
512g
Cornstarch — All Cup-to-Gram Conversions
| Cups | Grams | Ounces |
|---|---|---|
| ⅛ cups | 16g | 0.6 oz |
| ¼ cups | 32g | 1.1 oz |
| ⅓ cups | 43g | 1.5 oz |
| ½ cups | 64g | 2.3 oz |
| ⅔ cups | 85g | 3.0 oz |
| ¾ cups | 96g | 3.4 oz |
| 1 cup | 128g | 4.5 oz |
| 1¼ cups | 160g | 5.6 oz |
| 1½ cups | 192g | 6.8 oz |
| 1¾ cups | 224g | 7.9 oz |
| 2 cups | 256g | 9.0 oz |
| 2½ cups | 320g | 11.3 oz |
| 3 cups | 384g | 13.5 oz |
| 4 cups | 512g | 18.1 oz |
| 5 cups | 640g | 22.6 oz |
💡 Pro Tip: Used as a thickener. 1 tablespoon thickens about 1 cup of liquid.
Why Weigh Cornstarch in Grams?
When a recipe calls for 4 cups of cornstarch, using a kitchen scale to measure exactly 512 grams will give you far more consistent results than volume measurement alone. This is because cornstarch can be packed, sifted, or scooped differently each time, leading to weight variations of up to 20%.
How to Measure Cornstarch by Weight
Place your mixing bowl on a digital kitchen scale and press "tare" to zero it out. Then add cornstarch until the scale reads 512g. This method is faster than measuring cups and eliminates the guesswork entirely.
Also Known As
Cornstarch is sometimes referred to as corn starch, cornflour (UK). The same conversion of 128g per cup applies regardless of the name used.
Frequently Asked Questions
4 cups of cornstarch weighs exactly 512 grams or approximately 18.1 ounces. This is based on a standard US cup measurement of 128 grams per cup.
Yes, the density of cornstarch (128g per cup) is consistent across brands. Minor variations of ±5% may occur depending on grind, moisture, and how the ingredient is packed into the cup — which is exactly why weighing with a scale is recommended.
If measuring by cups, whether you sift can change the weight by 10-20%. When measuring by weight (512g), sifting doesn't affect accuracy since you're targeting an exact gram amount regardless of volume.
This conversion uses the US standard cup (236.6ml, commonly rounded to 240ml). If you're using a metric cup (250ml), the weight will be slightly higher. For perfect accuracy, always use a kitchen scale.