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120g Cornstarch = ¾ cup + 3 tbsp

120 grams of cornstarch equals ¾ cup + 3 tbsp (0.94 US Customary cups, 0.89 Metric 250 mL cups, 221.8 mL, 15 tablespoons, or 4.23 oz) when measured spooned & leveled at a verified density of 128g per US Customary cup.

Exact decimal volume: 0.94 US Customary Cups • 0.89 Metric Cups (250 mL) • 15 tbsp • 4.23 oz

Batch
Measuring density
Converted Measure
120 g Cornstarch (spooned & leveled) =
¾ US Cup + 3 tbsp
Physical scoop breakdown0.94 cups
1/2 cup
1/4 cup
×3
3 tbsp
Edit either side to reverseCornstarch chart →
Grams
120 g
Ounces
4.23 oz
US Cups
¾ cup + 3 tbsp
Metric (250mL)
0.89 c
Tablespoons
15 tbsp
Milliliters
221.8 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.

Batch Scaling Around 120g Cornstarch

Batch scaling conversion table around 120g of Cornstarch (0.5× to 3× recipe batches in grams, ounces, US cups, and milliliters)
Batch Scale Weight (g / oz) US Cups & Spoons Metric (mL)
Half Batch (0.5×) 60g (2.12 oz) ⅓ cup + 2 tbsp + ½ tsp 110.9 mL
Standard (1×) 120g (4.23 oz) ¾ cup + 3 tbsp 221.8 mL
1.5× Batch 180g (6.35 oz) 1 ⅓ cups + 1 tbsp + ½ tsp 332.7 mL
Double Batch (2×) 240g (8.47 oz) 1 ¾ cups + 2 tbsp 443.6 mL
Triple Batch (3×) 360g (12.7 oz) 2 ¾ cups + 1 tbsp 665.4 mL

Measuring 120g of Cornstarch in the Kitchen

Because 1 US Customary Cup (236.6 mL) of cornstarch weighs 128g when measured spooned & leveled, 120 Grams (120g) translates to 0.94 US cups (¾ cup + 3 tbsp). By contrast, using the dip scooped measure (145g/cup — a 17g per-cup shift), 120g occupies ¾ cup + 1 tbsp + ¾ tsp (0.83 cups).

Without a kitchen scale, measure ¾ cup + 3 tbsp (15 tablespoons total) using spooned & leveled technique. Cornstarch packs easily into a solid cake when pressed; scoop gently with a spoon and sweep level with a straightedge.

Source note: USDA FDC #169698 & Argo technical specifications

Frequently Asked Questions

How many cups is 120 grams of cornstarch? ▾

120 grams of cornstarch (spooned & leveled, 128g per US cup) equals ¾ cup + 3 tbsp (0.94 US Customary Cups, 0.89 Metric 250 mL cups, or 15 tablespoons).

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.