How many grams in a cup of corn syrup?

1 cup of light corn syrup weighs 341 g by USDA. King Arthur Baking lists 312 g. USDA lists dark corn syrup at 328 g per cup.

Sources: USDA FoodData Central, King Arthur Baking ingredient weight chart · Checked October 22, 2026

Amount

Unit

341 g 12 oz

Sources range from 312 g to 341 g for 1 cup.

Converting a whole recipe?

Sous Chef converts every ingredient in a recipe to grams and millilitres in one tap, rounded to amounts you would actually weigh.

Corn syrup cups to grams table

Using 341 g per US cup. A US cup is 236.6 mL; 1 cup is 16 tablespoons.

Corn syrup cups to grams
US cups	Grams	Ounces	Tablespoons
⅛ cup	43 g	1.5 oz	2
¼ cup	85 g	3 oz	4
⅓ cup	114 g	4 oz	5.3
½ cup	171 g	6 oz	8
⅔ cup	227 g	8 oz	10.7
¾ cup	256 g	9 oz	12
1 cup	341 g	12 oz	16
1½ cups	512 g	18 oz	24
2 cups	682 g	24.1 oz	32
3 cups	1,023 g	36.1 oz	48
4 cups	1,364 g	48.1 oz	64

Why sources disagree

The sources are 29 g apart, more than for most syrups. Corn syrup is thick and slow to level, and much of it stays on the cup, so a measured cup varies. USDA's tablespoon figure for light corn syrup is 22 g, close to its cup figure divided by 16. For candy and pecan pie, where sugar ratios matter, weigh it.

Source	Listed as	Grams per cup
USDA FoodData Central Syrups, corn, light	1 cup = 341 g	341 g
King Arthur Baking ingredient weight chart Corn syrup	1 cup = 312 g	312 g

Bold row is the figure the calculator uses. Figures listed for a smaller measure are multiplied up to one cup.

How to measure corn syrup accurately

Use the Light or Dark setting to match the bottle.
Spray the cup lightly with oil, or weigh the syrup straight into the pan.
Use a clear liquid measuring cup on a flat counter and read it at eye level.

Convert the whole recipe, not one line

Converting a recipe one ingredient at a time is where mistakes slip in. Sous Chef imports a recipe from a link or pasted text, then converts every ingredient at once: dry ingredients and butter to grams, liquids to millilitres. Tap again to go back to cups.

US recipe

2¼ cups all-purpose flour
1 cup butter, softened
¾ cup brown sugar, packed
1½ cups milk

In Sous Chef, after "Convert to metric"

275 g all-purpose flour
225 g butter, softened
170 g brown sugar, packed
350 ml milk

Example output. Sous Chef rounds to amounts you would actually weigh, so its numbers can differ by a few grams from the table above.

Common questions

How many grams is half a cup of corn syrup?

Half a cup of corn syrup is about 170.5 g, using 341 g per cup.

How many grams is 1 tablespoon of corn syrup?

1 tablespoon of light corn syrup is about 21 g, since 341 g per cup divided by 16 is 21 g. USDA's listed tablespoon is 22 g.

More conversions

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