Convert Cornstarch: cups to oz
1 cup of Cornstarch = 3.95 oz
Amount of Cornstarch
Density: 0.473 g/ml · Cornstarch
Cornstarch: cups to oz at a glance
The amounts people ask for most, worked out for Cornstarch.
How much Cornstarch weighs
Every figure below is one measured number — 112 g per US cup — scaled. That is why this table and the converter above it cannot disagree.
One cup, side by side
Why is cornstarch published per quarter cup?
Because that is nearer the amount a recipe asks for. King Arthur lists cornstarch at 28 g per quarter cup; four of those make the 112 g per cup that dishscale converts from. The arithmetic is exact, so a quarter cup still reads 28 g when you convert back.
Source for Cornstarch: King Arthur Baking (28 g per 1/4 cup) · King Arthur Baking ingredient weight chart
Frequently asked questions
How many oz is 1 cup of Cornstarch?
1 cup of Cornstarch is 3.95 oz, because one US cup of Cornstarch weighs 112 g. That single measured figure is the whole conversion — every other unit on this page is derived from it.
How many cups is 4 oz of Cornstarch?
4 oz of Cornstarch is 1.01 cups. It is the same conversion read backwards, so this page and its reverse always agree.
Is that ounces by weight, or fluid ounces?
By weight. dishscale's ounce is the international avoirdupois ounce, 28.3495 g, so one cup of Cornstarch is 3.95 oz. A US fluid ounce is a volume and there are eight of them to the cup, so that same cup is 8 fl oz at the same time. The two readings coincide only for an ingredient that happens to weigh eight ounces to the cup.
Where does dishscale's figure for Cornstarch come from?
One US cup of Cornstarch is 112 g. The dataset records that as: “King Arthur Baking (28 g per 1/4 cup)”. That is the King Arthur Baking ingredient weight chart. Every ingredient on the site carries the reference its weight came from, so any number here can be checked — and corrected if the source disagrees.