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Cornstarch — Grams ↔ Cups Converter

1 US Customary cup (236.6 mL) of cornstarch weighs 128 grams (4.52 ounces or 8g per tablespoon) when measured spooned & leveled; 1 Metric cup (250 mL) weighs 135.3g and 100g equals ¾ cup + 1 ½ tsp for accurate kitchen baking.

Batch
Measuring density
Converted Measure
100 g Cornstarch (spooned & leveled) =
¾ US Cup + 1 ½ tsp
Physical scoop breakdown0.78 cups
1/2 cup
1/4 cup
1 ½ tsp
Edit either side to reverseCornstarch chart →
Grams
100 g
Ounces
3.53 oz
US Cups
¾ cup + 1 ½ tsp
Metric (250mL)
0.74 c
Tablespoons
12.5 tbsp
Milliliters
184.8 mL

Kitchen note: Test-kitchen baseline uses spooned & leveled (128g/cup). Switching to dip scooped (145g/cup) changes each cup by 17g—use the packing toggle on the scale bench to match your recipe.

Cornstarch: Cups & Spoons to Grams

Based on 128g per 236.6 mL US cup (spooned & leveled).

Cornstarch cups, tablespoons, and teaspoons to grams and ounces conversion chart (128g per US cup)
Volume Grams Ounces
1 Teaspoon (tsp) 2.7 g 0.09 oz
1 Tablespoon (tbsp) 8 g 0.28 oz
⅛ US Cup (2 tbsp) 16 g 0.56 oz
¼ US Cup (4 tbsp) 32 g 1.13 oz
⅓ US Cup 42.7 g 1.51 oz
½ US Cup (8 tbsp) 64 g 2.26 oz
⅔ US Cup 85.3 g 3.01 oz
¾ US Cup (12 tbsp) 96 g 3.39 oz
1 US Cup (236.6 mL) 128 g 4.52 oz
1 Metric Cup (250 mL) 135.3 g 4.77 oz
1 ½ US Cups 192 g 6.77 oz
2 US Cups 256 g 9.03 oz
3 US Cups 384 g 13.55 oz
4 US Cups (1 Quart) 512 g 18.06 oz

Cornstarch: Grams to US Cups

Nearest practical baker cup & spoon breakdown.

Cornstarch grams to US cups and kitchen spoon fractions conversion chart
Weight Kitchen Measure Decimal
10 g 1 tbsp + ¾ tsp 0.08 c
25 g 3 tbsp + ½ tsp 0.20 c
50 g ⅓ cup + 2 ¾ tsp 0.39 c
75 g ½ cup + 1 tbsp + 1 ¼ tsp 0.59 c
100 g ¾ cup + 1 ½ tsp 0.78 c
125 g ¾ cup + 3 tbsp + 2 tsp 0.98 c
150 g 1 cup + 2 tbsp + 2 ¼ tsp 1.17 c
200 g 1 ½ cups + 1 tbsp 1.56 c
250 g 1 ¾ cups + 3 tbsp + ¾ tsp 1.95 c
300 g 2 ⅓ cups 2.34 c
400 g 3 ⅛ cups 3.13 c
500 g 3 ¾ cups + 2 tbsp + 1 ½ tsp 3.91 c
750 g 5 ¾ cups + 1 tbsp + 2 ¼ tsp 5.86 c
1000 g 7 ¾ cups + 1 tbsp 7.81 c

How to Measure Cornstarch Accurately

Cornstarch packs easily into a solid cake when pressed; scoop gently with a spoon and sweep level with a straightedge.

Packing Density Comparison (1 US Cup)

  • spooned & leveled (Test-kitchen standard) 128 g
  • Dip scooped 145 g

Data reference: USDA FDC #169698 & Argo technical specifications

Common Culinary Uses

  • Pies and fruit filling thickener
  • Pudding and pastry cream
  • Crispy fried coatings
  • Shortbread tenderness agent

Weight-Aware Substitutions

  • Use 2 tbsp (16g) all-purpose flour for every 1 tbsp (8g) cornstarch, simmering longer to cook out raw flour taste

Exact Cornstarch Recipe Conversions

Grams & Ounces to Cups

25g Cornstarch to cups 30g Cornstarch to cups 50g Cornstarch to cups 75g Cornstarch to cups 85g Cornstarch to cups 100g Cornstarch to cups 120g Cornstarch to cups 125g Cornstarch to cups 150g Cornstarch to cups 175g Cornstarch to cups 200g Cornstarch to cups 225g Cornstarch to cups 250g Cornstarch to cups 300g Cornstarch to cups 350g Cornstarch to cups 400g Cornstarch to cups 450g Cornstarch to cups 500g Cornstarch to cups 4 oz Cornstarch to cups 8 oz Cornstarch to cups 16 oz Cornstarch to cups

Cups, Spoons & Sticks in Grams

¼ cup Cornstarch in grams ⅓ cup Cornstarch in grams ½ cup Cornstarch in grams ⅔ cup Cornstarch in grams ¾ cup Cornstarch in grams 1 cup Cornstarch in grams 2 cups Cornstarch in grams 1 tbsp Cornstarch in grams 100 mL Cornstarch in grams

Cornstarch Measuring FAQs

Why must cornstarch be dissolved in cold liquid first? ▾

Adding dry cornstarch directly to hot liquid gelatinizes the surface instantly, causing stubborn lumps.

Is cornstarch in the UK called cornflour? ▾

Yes, British recipes calling for cornflour mean pure white refined cornstarch (128g/cup), not yellow cornmeal.