1/4 Cup Cornstarch in Grams
1/4 cup of cornstarch weighs 28 g (spooned and levelled, King Arthur Baking). Fine white starch from corn; a powerful thickener with no flavour of its own. All the figures on this page are approximate conversions based on the King Arthur Baking value of 112 g per cup, so when a recipe really matters, verify with a kitchen scale.
Why a quarter cup is worth weighing
A quarter cup is a small measure, and small measures are where cup errors hurt most. A 5 g mistake in a full cup of cornstarch is a rounding error; the same 5 g on a quarter cup is a 17 percent swing on 28 g, and in a small batch that swing can change the result. Recipes that call for a quarter cup are usually small, precise or both — a mug cake, a glaze, a roux, a single-serve bake — and there is no large batch to absorb the error. Weighing 28 g takes five seconds and removes the problem entirely.
Spooned and levelled is the method behind the number, and it matters. Cornstarch is used for thickening sauces, gravies and custards; lightening cakes. That range of uses is part of why the conversion comes up so often: the same ingredient appears in everyday cooking and in precise baking, and the two situations demand different levels of accuracy. Grams cut through all of that: 28 g of cornstarch is 28 g whatever the brand, the humidity or the size of your measuring cup.
Cornstarch cups to grams conversion table
| Cups | Grams | Tablespoons |
|---|---|---|
| 1/4 cup | 28 g | 4 |
| 1/3 cup | 37.3 g | 5.3 |
| 1/2 cup | 56 g | 8 |
| 2/3 cup | 74.7 g | 10.7 |
| 3/4 cup | 84 g | 12 |
| 1 cup | 112 g | 16 |
| 1 1/2 cups | 168 g | 24 |
| 2 cups | 224 g | 32 |
The tablespoon column shows how many tablespoons each amount equals: a quarter cup is 4 tablespoons, and one tablespoon of cornstarch weighs about 7 g. A cup is 16 tablespoons, so the numbers in the table are just the cup weight divided by 16, rounded to one decimal place. For small amounts a scale that reads to the gram is far more reliable than a spoon, because a heaped tablespoon can weigh half as much again as a level one. Read the table from the 1/4-cup row outwards: every other row is a multiple of 28 g, so scaling a recipe up or down is simple multiplication.
How the weight was measured
Spooned and levelled means the ingredient is measured the way King Arthur Baking measures it: spooned and levelled. For cornstarch, that gives 112 g per cup, and a quarter of that is 28 g. The source for the figure is King Arthur Baking, and the confidence in the value is high. King Arthur Baking publishes a standard ingredient weight chart that recipe developers use as a reference, and this page follows it exactly rather than averaging across sources, because an average of two different measuring methods is a number that matches nobody's cup.
There is no serious dispute about this figure: King Arthur Baking lists 112 g per cup, and other reputable charts agree within a gram or two. The variation that remains comes from how the ingredient is measured, not from disagreement about the number itself.
Worked examples
A small batch of scones
A half-batch of scones for a quiet afternoon uses around 1/4 cup of cornstarch per scone's share of the dough, and the total for four small scones is often close to a cup. But when you are testing a new flour, making a trial batch with 1/4 cup — 28 g — tells you how the flour behaves before you commit a full bag. Cornstarch is fine white starch from corn; a powerful thickener with no flavour of its own, and that character shows up in the crumb even at this scale.
A trial loaf with a new flour
When you try cornstarch for the first time, a test bake with 1/4 cup — 28 g — blended into your usual dough shows you how it drinks water and how it handles, without risking a whole loaf. Fine white starch from corn; a powerful thickener with no flavour of its own. Weigh the trial amount, note how the dough feels, and adjust the hydration next time. A scale turns a vague impression into a number you can repeat.
A small batch of pancakes for two
A weekend pancake batch for two people often needs just 1/4 cup of cornstarch alongside the egg, milk and raising agent. That is 28 g on the scale, and it is worth weighing because pancakes are a batter, and batter thickness decides whether the pancakes spread thin or stay tall and fluffy. Too much flour and the batter barely moves in the pan; too little and it runs everywhere. Once you know that 1/4 cup is 28 g, you can scale the same batter up for four people by doubling to 56 g without ever touching a measuring cup.
Spoon, level, never scoop
The single biggest error in flour measurement is scooping the cup straight from the bag. A scooped cup of cornstarch can weigh 20 g more than a spooned and levelled one, and at quarter-cup scale that error is 5 g on 28 g — a 17 percent swing. Spoon the flour into the cup, level it with the back of a knife, and the number on this page matches what is in your bowl. If you own a scale, skip the cup entirely and weigh 28 g directly.
Scaling a quarter cup up and down
Once you know that 1/4 cup of cornstarch is 28 g, the rest is arithmetic. Half a cup is 56 g, three quarters is 84 g, and a full cup is 112 g. Doubling a recipe that calls for 1/4 cup means weighing 56 g; halving it means 14 g, which is 2 tablespoons. Writing the recipe in grams at this point is worth doing: the next time you make it, you weigh 28 g straight into the bowl and skip the measuring cup altogether. If you are scaling a recipe for a different tin size, convert every ingredient to grams first and then multiply — scaling by volume compounds the error on every ingredient at once, while scaling by weight keeps each one exact.
Common mistakes with cornstarch
- Scooping the cup from the bag. Scooping packs the flour down and can add 20 g per cup — 5 g on a quarter cup. Always spoon and level, or weigh 28 g.
- Measuring over the mixing bowl. Levelling over the bowl drops the excess straight into the batter, so you have added flour you did not intend. Level over the bag or the sink.
- Using a liquid jug for flour. A jug measures volume at eye level and has no straight edge to level against, so flour measured in a jug is a guess. Use a dry cup or a scale.
- Sifting after measuring. Sifting changes the volume, not the weight. If a recipe says sifted flour, measure 28 g first, then sift it — never the other way round.
Storage and handling
Airtight container, cool and dry, indefinitely. Keeping cornstarch stored properly also keeps its weight per cup stable: an ingredient that has absorbed moisture from the air weighs more per cup than a dry one, so a sealed container is not just about freshness, it is about measurement accuracy too. If a bag has been open for months in a humid kitchen, the first thing to do before a precise bake is to weigh the ingredient rather than trusting the cup. Label the container with the conversion — 1/4 cup is 28 g — and the next person to bake with it will thank you.
Frequently asked questions
How many grams is 1/4 cup of cornstarch?
1/4 cup of cornstarch weighs 28 g, measured spooned and levelled according to King Arthur Baking. That is one quarter of the full-cup weight of 112 g, and it is the figure to use when converting a recipe from cups to grams. All the figures on this page are approximate, so when a recipe really matters, verify with a kitchen scale.
Is 1/4 cup of cornstarch always 28 g?
No — 28 g is the standard value from King Arthur Baking for cornstarch measured spooned and levelled, and it is the right default. Brand, moisture, how settled the container is and how firmly it was packed can shift the weight by a few grams. For most cooking that variation does not matter. For precise baking, weigh the ingredient and trust the scale over the cup.
How many tablespoons is 1/4 cup of cornstarch?
There are 4 tablespoons in a quarter cup, whatever the ingredient. One tablespoon of cornstarch weighs about 7 g, so 4 tablespoons come to about 28 g. For small amounts like this, a scale that reads to the gram is more reliable than spoons, because a heaped tablespoon can weigh half as much again as a level one.
What is cornstarch used for?
Thickening sauces, gravies and custards; lightening cakes. Fine white starch from corn; a powerful thickener with no flavour of its own. A quarter cup — 28 g — is a common amount in small batches, glazes, sauces and test bakes, which is why this conversion comes up so often.
How should I store cornstarch?
Airtight container, cool and dry, indefinitely. Good storage keeps the ingredient fresh and keeps its weight per cup consistent, because moisture absorbed from the air adds grams that the recipe did not ask for.
Related conversions
Use the cups to grams converter flour substitute converter recipe scaler for instant answers, or browse the cups to grams hub for the full ingredient list. Related pages: 1 cup of cornstarch in grams, 1/2 cup of cornstarch in grams, 112 g of cornstarch in cups, tablespoons of cornstarch in grams, 1/4 cup of all-purpose flour in grams, 1/4 cup of bread flour in grams. See also our disclaimer about approximate conversions.