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1 US cup = 240 ml, 1 tablespoon = 15 ml, 1 teaspoon = 5 ml. Figures verified 5 August 2026. https://cupsngrams.com/corn-syrup
Corn Syrup: Cups to Grams
One US cup (240 ml) of corn syrup weighs 328 grams; half a cup weighs 164 grams. A quarter cup is 82 grams, a tablespoon is 20.5 grams and a teaspoon is 6.83 grams. A cup measures volume, not weight, so these numbers are for corn syrup only: a cup of all-purpose flour weighs 125 grams.
328 g
1 cup of corn syrup = 328 g (US legal cup, 240 ml)
1 cup of corn syrup = 328 g (US legal cup, 240 ml)
Based on corn syrup at 328 g per US cup.
CupsToGrams, cupsngrams.com
Baking from a UK, Australian or New Zealand recipe? Their cup is not the American one. Pick the standard your recipe assumes and every cup figure follows it.
Corn Syrup conversion table
| Cups | Cups (decimal) | Grams | Tablespoons | Millilitres | Ounces (weight) |
|---|---|---|---|---|---|
| 1/8 cup | 0.125 | 41 g | 2 tbsp | 30 ml | 1.45 oz |
| 1/4 cup | 0.25 | 82 g | 4 tbsp | 60 ml | 2.89 oz |
| 1/3 cup | 0.33 | 109 g | 5.33 tbsp | 80 ml | 3.86 oz |
| 1/2 cup | 0.5 | 164 g | 8 tbsp | 120 ml | 5.78 oz |
| 2/3 cup | 0.67 | 219 g | 10.7 tbsp | 160 ml | 7.71 oz |
| 3/4 cup | 0.75 | 246 g | 12 tbsp | 180 ml | 8.68 oz |
| 1 cup | 1 | 328 g | 16 tbsp | 240 ml | 11.6 oz |
| 1 1/4 cups | 1.25 | 410 g | 20 tbsp | 300 ml | 14.5 oz |
| 1 1/3 cups | 1.33 | 437 g | 21.3 tbsp | 320 ml | 15.4 oz |
| 1 1/2 cups | 1.5 | 492 g | 24 tbsp | 360 ml | 17.4 oz |
| 1 2/3 cups | 1.67 | 547 g | 26.7 tbsp | 400 ml | 19.3 oz |
| 1 3/4 cups | 1.75 | 574 g | 28 tbsp | 420 ml | 20.2 oz |
| 2 cups | 2 | 656 g | 32 tbsp | 480 ml | 23.1 oz |
| 2 1/4 cups | 2.25 | 738 g | 36 tbsp | 540 ml | 26 oz |
| 2 1/2 cups | 2.5 | 820 g | 40 tbsp | 600 ml | 28.9 oz |
| 3 cups | 3 | 984 g | 48 tbsp | 720 ml | 34.7 oz |
| 3 2/3 cups | 3.67 | 1203 g | 58.7 tbsp | 880 ml | 42.4 oz |
Ounces here are ounces of weight (1 oz = 28.35 g), not fluid ounces. One US cup is 8 fluid ounces of volume whatever is in it, but what it weighs in ounces depends on the ingredient: a cup of corn syrup weighs about 11.6 oz. Why these two are not the same. Decimals for thirds are rounded (1/3 cup is 0.333 cups), and each linked amount opens a page comparing every ingredient at that measure.
Cite this: CupsToGrams, "Corn Syrup: Cups to Grams", https://cupsngrams.com/corn-syrup, figures verified . The data is free to reuse under CC BY 4.0 with a link back to this page.
About measuring corn syrup
Corn syrup is a thick glucose syrup used to keep candies smooth and icings glossy, and one US cup weighs about 328 grams. Like other syrups it is dense and sticky, so weighing beats measuring by volume. In candy making the exact amount matters because corn syrup controls crystallisation, the difference between a silky caramel and a grainy one. Set the pan on the scale and pour to the gram for the best results.
In candy making, corn syrup controls crystallisation, so weigh it precisely for smooth results.
How many grams is a cup of corn syrup?
One US cup (240 ml) of corn syrup weighs about 328 grams. Because a cup measures volume rather than weight, that figure is specific to corn syrup and does not transfer to any other ingredient: the same cup holds 125 grams of all-purpose flour and 340 grams of honey.
- 1/4 cup of corn syrup is about 82 grams
- 1/3 cup of corn syrup is about 109 grams
- 1/2 cup of corn syrup is about 164 grams
- 2/3 cup of corn syrup is about 219 grams
- 3/4 cup of corn syrup is about 246 grams
- 1 1/2 cups of corn syrup is about 492 grams
- 2 cups of corn syrup is about 656 grams
- 3 cups of corn syrup is about 984 grams
Working the other way round, 100 grams of corn syrup is about 0.305 cups, and 500 grams is about 1.52 cups.
Does it matter which cup my recipe means?
It does, though less than the ingredient itself. This page uses the US legal cup of 240 ml. An Australian metric cup is 250 ml, so a metric cup of corn syrup comes to about 342 grams, and the old British imperial cup of 284.1 ml holds about 388 grams. See cup sizes by country for every standard side by side.
Frequently asked questions
How many grams is 1 cup of corn syrup?
One US cup of corn syrup is about 328 grams. It is a dense, sticky glucose syrup, heavier than a cup of water.
How many grams is a tablespoon of corn syrup?
About 20.5 grams. A cup weighs around 328 grams and holds 16 tablespoons, giving roughly 20.5 grams each.
Why does candy making call for weighing corn syrup?
Corn syrup controls how sugar crystallises. Small errors can turn a smooth caramel grainy, so weighing to the gram gives more dependable candy.
How much does 1/3 cup of corn syrup weigh?
1/3 cup of corn syrup weighs 109 grams. A full US cup weighs 328 grams.
How do you measure 1/3 cup of corn syrup with spoons?
1/3 cup is 5 tablespoons and 1 teaspoon (80 ml). With a syrup this sticky, weighing out 109 grams is quicker and leaves nothing behind in the spoon.
Where this figure comes from
We have not yet found a published reference that states a weight for a cup of corn syrup. The 328 grams on this page follows the calibration the rest of the site is built on, with butter at 227 grams per cup, water at 240, all-purpose flour at 125 and granulated sugar at 200. Treat it as a good working figure rather than a cited one. If you have a better source, tell us and we will check it and credit you.
Published figures for the same ingredient vary between references anyway, because how an ingredient is packed changes what a cup of it weighs. Treat any cup figure as accurate to within a few percent, and weigh on a scale when a recipe is sensitive. Our full approach is on the methodology page.
Figures last verified . Compiled by the CupsToGrams editorial team at FusionStudios. Spotted a value that looks off? Tell us.