1/2 Cup Corn Syrup in Grams
1/2 cup of corn syrup weighs 156 g (poured, King Arthur Baking). Glucose syrup that stays liquid and prevents crystallisation. All the figures on this page are approximate conversions based on the King Arthur Baking value, so when a recipe really matters, verify with a kitchen scale.
Glucose syrup that stays liquid and prevents crystallisation. It is used for candy, pecan pie filling, frostings and sauces. 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. Knowing the weight of half a cup, rather than guessing from a measuring cup, keeps the result consistent no matter which recipe you are following.
Why weighing half a cup of corn syrup beats measuring it in cups
Half a cup is the amount most recipes call for when a syrup is a main ingredient rather than a drizzle: a gingerbread, a glaze, a batch of granola or a pecan pie filling. corn syrup is heavy, 156 g for 1/2 cup, which is far more than the same volume of sugar, so swapping syrups or sugars cup-for-cup is a mistake that changes both sweetness and moisture. The weight on this page, measured poured from King Arthur Baking, gives you a fixed number to work from, and because syrups are liquids, a gram is also easy to scale up or down in any proportion.
Corn Syrup cups to grams conversion table
| Cups | Grams (approx.) |
|---|---|
| 1/4 cup | 78 g |
| 1/3 cup | 104 g |
| 1/2 cup | 156 g |
| 2/3 cup | 208 g |
| 3/4 cup | 234 g |
| 1 cup | 312 g |
| 1 1/2 cups | 468 g |
| 2 cups | 624 g |
| 3 cups | 936 g |
One tablespoon of corn syrup weighs about 19.5 g, and one teaspoon about 6.5 g. 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. The table is rounded to the nearest half gram, so the numbers are approximate by design; the half-cup figure of 156 g is the one to use when a recipe calls for half a cup.
How the weight was measured
Poured means pouring the ingredient into a liquid measuring jug on a flat surface and reading the level at eye level. Liquids level themselves, so there is no spooning or levelling involved, and the weight follows directly from the volume and the density.
The source for the 312 g per cup 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.
Because corn syrup is measured poured, the weight per cup is stable from one kitchen to the next, and the 156 g figure for half a cup is a reliable default. Small differences in brand or temperature shift it by only a gram or two, which is far below the threshold that changes a recipe.
All the figures on this page are approximate conversions. When a recipe really matters, verify with a kitchen scale: weigh the ingredient directly into the bowl on a tared scale and trust that number over any cup.
Worked examples
A batch of granola
A granola recipe using 1/2 cup of corn syrup needs 156 g to coat the oats evenly. Too little and the clusters never form; too much and the granola burns before it crisps. Weighing the syrup into the bowl guarantees an even coating.
Doubling a pecan pie filling
Doubling a pie filling that uses 1 cup of corn syrup means 312 g. At that scale a cup error is a sticky, unset filling, so the scale is not a luxury, it is the difference between a pie that slices and one that runs.
A marinade or barbecue sauce
A marinade calling for 1/3 cup of corn syrup needs about 104 g. The syrup balances salt and acid in the sauce, and weighing it keeps the balance right even when you scale the recipe for a crowd.
When this conversion matters most
The weight matters whenever corn syrup is doing more than adding sweetness. In a marinade it balances salt and acid; in a granola it binds the clusters; in a cake it is a large share of the liquid. In a cup of tea, by contrast, a gram or two either way is invisible, so save the scale for the recipes where the syrup is load-bearing and spoon freely where it is not.
Common mistakes with corn syrup
- Heating the syrup to make it pour. Warming helps it flow, but hot syrup weighs the same and is harder to control. Room-temperature syrup poured slowly onto a scale is accurate and safe.
- Rounding to a neat number. Rounding 156 g to 170 g feels tidy but is a small error in a glaze where ratios are tight. Keep the real figure; the scale does the work.
- Measuring with a tablespoon for a half-cup. Eight tablespoons of sticky syrup means eight chances to lose some on the spoon. Weigh 156 g in one pour instead.
- Storing syrup in the fridge unnecessarily. Cold syrup thickens and pours slowly, which tempts you to guess. Keep corn syrup as the storage note on this page advises so it stays pourable.
Storage and handling
Airtight container at room temperature, up to 1 year. Keeping corn syrup 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 good storage is not just about freshness, it is about measurement accuracy too. If a container 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.
Frequently asked questions
How many grams is 1/2 cup of corn syrup?
1/2 cup of corn syrup weighs 156 g, measured poured according to King Arthur Baking. That is the figure to use when converting a recipe from cups to grams, and it is the value the conversion table on this page is built on.
How do I measure corn syrup without a scale?
Poured means pouring the ingredient into a liquid measuring jug on a flat surface and reading the level at eye level. Liquids level themselves, so there is no spooning or levelling involved, and the weight follows directly from the volume and the density. That gives the closest result to 156 g per half-cup, but it is still an estimate: the honest answer is that a scale is the only way to know the exact weight, and a basic digital kitchen scale costs less than a bag of good flour.
How do I measure corn syrup without a scale?
Pour it into a liquid measuring jug at eye level and read the meniscus at 1/2 cup, then scrape the jug out thoroughly with a spatula. Or grease the cup lightly first so the syrup slides out. Both work, but neither is as accurate as weighing 156 g on a scale.
What is corn syrup used for?
Candy, pecan pie filling, frostings and sauces. Glucose syrup that stays liquid and prevents crystallisation.
Does 1/2 cup of corn syrup always weigh 156 g?
Almost. Syrups are liquids, so they are far more consistent than flours: brand and temperature shift the weight by only a gram or two. The 156 g figure is the standard King Arthur Baking value for corn syrup measured poured, and it is a reliable default.
How should I store corn syrup?
Airtight container at room temperature, up to 1 year. 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 sugar substitute converter or the cups to grams converter for instant answers, or browse the cups to grams hub for the full ingredient list. Related pages: 1/2 cup honey in grams, 1/2 cup maple syrup in grams, 1/2 cup molasses in grams. More tools: cups to grams converter, grams to cups converter, recipe scaler. See also our disclaimer about approximate conversions.