Pantry Staples
Corn Syrup Conversion
Corn Syrup weighs 328g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 328.0 g | 11.57 oz |
| 1/2 cup | 164.0 g | 5.78 oz |
| 1/4 cup | 82.0 g | 2.89 oz |
| 1 tbsp | 20.5 g | 0.72 oz |
| 1 tsp | 6.8 g | 0.24 oz |
| 100 g | 100.0 g | 3.53 oz |
Need a different amount? Use the full Ingredient Converter tool.
Corn syrup weighs 328 grams per cup, matching molasses's weight closely, though the two are chemically unrelated — corn syrup is a glucose syrup derived from corn starch, prized in cooking not primarily for sweetness but for its ability to prevent sugar crystallization, which is why it shows up so often in candy-making, caramel, and pecan pie recipes.
Light and dark corn syrup are different products worth distinguishing: light corn syrup is a clear, mild-flavored syrup, while dark corn syrup has refiners' syrup (a molasses-like product) added back in for color and a deeper flavor — recipes typically specify which one deliberately, and substituting one for the other changes both color and flavor, not just sweetness.
Corn syrup is also genuinely different from high-fructose corn syrup, a common point of consumer confusion — high-fructose corn syrup has been further processed to convert much of its glucose into fructose for a sweeter taste and is used mainly in commercial food and beverage manufacturing, while the corn syrup sold for home baking (like Karo) hasn't undergone that additional conversion.
Corn syrup's 328g-per-cup weight places it between granulated sugar's dry 200g and honey's dense 340g, reflecting its own liquid, moderately viscous structure — light and dark corn syrup weigh essentially the same per cup, with the difference between them being flavor (dark corn syrup includes molasses) rather than density.
Corn syrup's main functional role in candy-making is preventing sugar crystallization — its glucose molecules physically interfere with sucrose crystals forming, which is why pecan pie and caramel recipes lean on it for a smooth, non-grainy set that plain sugar syrup alone struggles to achieve.
It's chemically distinct from high-fructose corn syrup, which is processed further to convert some of its glucose into fructose.
Some bakers substitute golden syrup for corn syrup in a pinch, since both serve a similar anti-crystallization role in candy making.
Frequently asked questions
Is corn syrup the same as high-fructose corn syrup?
No — this is a common mix-up. Standard corn syrup sold for home baking is a glucose syrup that hasn't been processed to convert glucose into fructose, while high-fructose corn syrup has undergone that extra step and is used mainly in commercial manufacturing, not home baking.
What's the difference between light and dark corn syrup?
The light version is clear and mild; the dark version gets a molasses-adjacent syrup blended in for color and a deeper, more caramel-forward taste — most recipes name one specifically on purpose, and switching them changes both how the finished dish looks and tastes.
Why does pecan pie specifically call for corn syrup?
Corn syrup's main functional role is preventing sugar crystallization as the filling cools and sets, which keeps a pecan pie's filling smooth and glossy rather than grainy — a job plain granulated sugar syrup doesn't do nearly as reliably.
Can I substitute honey or maple syrup for corn syrup?
It works in some recipes but changes the flavor and, more importantly, doesn't prevent sugar crystallization the same way corn syrup's specific glucose structure does — a real trade-off in a candy or caramel recipe where crystallization control is the whole point of using corn syrup.
Is corn syrup gluten-free?
Yes — despite being derived from corn, standard corn syrup is a highly processed glucose syrup that contains no gluten protein, making it safe for gluten-free diets.