Cornflour (Cornstarch) — Cups to Grams Conversion
One cup of cornflour weighs 120g.
Cornflour (Cornstarch) Cups to Grams Chart
| Cups | Grams |
|---|---|
| ¼ cup | 30g |
| ⅓ cup | 40g |
| ½ cup | 60g |
| ¾ cup | 90g |
| 1 cup | 120g |
| 1½ cups | 180g |
| 2 cups | 240g |
| 3 cups | 360g |
Source: King Arthur Baking ingredient weight chart · Measurement method: Spooned & levelled
Tablespoon & Teaspoon Weights
| Measure | Grams | Notes |
|---|---|---|
| 1 tbsp (US/UK — 15ml) | 7.5g | Standard in US, UK, Canada |
| 1 tbsp (Australian — 20ml) | 10g | One-third larger than US/UK |
| 1 tsp (5ml — universal) | 2.5g | Same worldwide |
About Cornflour (Cornstarch)
A pure, very fine starch from the corn kernel's endosperm, used mainly as a thickener for sauces, gravies, and fillings, and in small amounts to soften cakes and shortbread by diluting overall flour protein.
Why the Weight Per Cup Varies
Extremely fine and light, cornflour packs densely when scooped — a spooned cup weighs 120g. Because it is normally used in small tablespoon quantities, precision matters more than for most flours.
Names in Different Countries
"Cornstarch" (US/Canada) = "cornflour" (UK/AU). Do not confuse with US "corn flour," a whole-grain cornmeal product — check the ingredient list says only corn starch.
Common Recipe Uses
Thickening sauces/gravies/custards/pie fillings, the cake flour substitute, shortbread texture.
Substitutions
Arrowroot or potato starch substitute 1:1 as thickeners. Plain flour substitutes at double the quantity but produces a cloudier result.
Frequently Asked Questions
Yes — the same pure white starch, named differently by region. Do not confuse with whole-grain "corn flour."
1 tbsp cornflour mixed with 1 tbsp cold water thickens roughly 1 cup (240ml) of liquid to medium consistency.
Always mix cornflour with cold liquid into a slurry first; adding it straight to hot liquid causes instant clumping.
7.5g for a US/UK tablespoon, or 10g Australian.
Recommended for accurate baking
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