A kilogram of corn syrup fills roughly 3.21 US cups. If you have just bought a 1 kg bag or tub and your recipe is written in cups, that is the conversion you need: divide 1,000 g by the weight of one cup, 312 g poured (King Arthur Baking), and the answer is 3.21 cups. Treat it as a close, practical figure rather than an exact one, and weigh the ingredient whenever precision matters.

Corn Syrup is glucose syrup that stays liquid and prevents crystallisation. It is used for candy, pecan pie filling, frostings and sauces. That is why the kilogram-to-cups question comes up so often: corn syrup is sold by weight in most countries, while many recipes — especially American ones — measure it in cups. This page converts the whole kilogram, not just a single cup, so you can plan a whole bag or tub against a recipe instead of converting one spoonful at a time.

Conversion table: kilograms of corn syrup to cups

One US cup is 236.6 ml, and one cup of corn syrup weighs 312 g poured. Every row below is that cup weight divided into the weight shown, so the whole table follows from a single number. Figures are rounded to two decimal places and labelled approximate.

Weight Cups (approx.)
100 g 0.32
250 g 0.8
500 g 1.6
750 g 2.4
1 kg (1,000 g) 3.21
1.5 kg (1,500 g) 4.81
2 kg (2,000 g) 6.41

The same cup weight works in the other direction too:

Measure Weight (approx.)
1 cup 312 g
1 tablespoon 19.5 g
1 teaspoon 6.5 g
1 kg in tablespoons about 51 tbsp

If you only need part of the kilogram, the table above is the fastest way to read it off. Half a kilogram is 1.6 cups, a quarter is 0.8 cups, and 100 g — a common recipe amount — is 0.32 cups.

How the figure is worked out

The calculation is a single division: 1,000 g ÷ 312 g per cup = 3.21 cups. The only input is the weight of one cup of corn syrup, and that comes from King Arthur Baking, which lists one US cup of corn syrup at 312 g, poured. The confidence rating on that figure is high, which means it is a published, checked value rather than an estimate — but it is still a cup measurement, and cups are never as exact as grams.

Poured means filling the cup from a jug and reading the level at eye height, with the cup on a flat surface. Liquids do not pack or settle the way dry ingredients do, so the main error is a meniscus read at an angle or a cup that is not quite level.

That is also why every number here carries the word approximate. A cup is a volume measure being used as a stand-in for weight, and the two only line up when the filling method matches the published one. If the dish is forgiving — a stew, a marinade, a crumble topping — the cup figure is plenty. If it is a cake, a loaf of bread, or anything where a 10% error changes the texture, weigh the ingredient on a kitchen scale and skip the cups entirely.

Worked examples

The table is useful, but recipes do not come in kilograms. Here are three ordinary situations where the kilogram-to-cups figure does real work.

Example 2 — doubling a cookie batch

Your cookie recipe uses 1½ cups of corn syrup (468 g) and you want to double it for a school bake sale. Doubled, that is 3 cups, or 936 g — about 94% of a kilogram bag. Weighing 936 g straight from the bag is faster and more accurate than scooping three cups, and you still have 0.21 cups in reserve.

Example 3 — a glaze measured in grams

A glaze recipe lists 100 g of corn syrup rather than cups. That is 0.32 cups — just over half a cup, or about 5.1 tablespoons. Measuring the glaze by weight avoids the common mistake of packing a cup too firmly and ending up with a glaze that sets too sweet and too thick.

Example 1 — a cake from a 1 kg bag

A sponge cake calls for 2 cups of corn syrup. Two cups weigh 624 g, so from a 1 kg bag you use just over a third of it and have about 1.21 cups left — enough for a second, smaller bake. If you are making the same cake again next weekend, one bag covers roughly 1.6 two-cup cakes before it runs out.

Measuring it well, and storing what is left

The most common mistake with corn syrup is the packing question. Poured is the method behind every figure here, and changing the method changes the weight. A cup scooped hard from the bag can weigh 10–20% more than a spooned-and-levelled cup, which in a cake means a sweeter, denser crumb and a bake that browns too fast. The second mistake is measuring over the mixing bowl: spill a little extra in and there is no way to take it back. Measure over the bag or a plate instead.

Storage matters once you have opened a kilogram pack. Airtight container at room temperature, up to 1 year. A kilogram is a lot of corn syrup for a home kitchen — for most households it will last weeks or months — so decanting it into a sealed container on the day you open it is worth doing: it keeps the weight stable, keeps moisture out, and means the cup you measure in a month weighs the same as the cup you measure today.

Without a scale, tablespoons are the fallback: one kilogram of corn syrup is about 51 level tablespoons, and one cup is 16 tablespoons, so you can build any amount in the table above from spoonfuls. It is slower than weighing, and each spoonful adds its own small error, but for soups, marinades, and everyday cooking it is close enough. For baking, borrow or buy a scale — it is the single cheapest upgrade to a home baker's accuracy.

Buying it by the kilogram

Shops sell corn syrup by weight, and the kilogram is the standard pack size in most countries outside the United States. Knowing that the pack holds about 3.21 cups lets you compare it honestly against smaller packs: a 500 g pack is 1.6 cups, so if the kilogram costs less than twice the 500 g price, it is the better buy — provided you will use it before it goes stale. For corn syrup, candy, pecan pie filling, frostings and sauces. Work out how many cups your household actually uses in a month before choosing the big pack; a bargain that ends up thrown away is not a bargain. And remember the figure is approximate: if the recipe on the packet is written in grams, follow the grams. Cups are a translation, not the original.

Frequently asked questions

How many cups are in 1 kg of corn syrup?

About 3.21 cups. One cup of corn syrup weighs 312 g poured (King Arthur Baking), and 1,000 g ÷ 312 g = 3.21 cups. The figure is approximate, because how firmly the cup is filled changes the weight slightly.

How many tablespoons are in 1 kg of corn syrup?

About 51 level tablespoons. One tablespoon of corn syrup weighs 19.5 g, so 1,000 g divided by that is 51 spoonfuls. Tablespoons are a workable fallback when there is no scale, but each spoonful adds a little error, so weigh when it matters.

Can I use the same cups-per-kilogram figure for other brands of corn syrup?

Usually, yes, within a small margin. The cup weight of a standard ingredient is set by its density, which barely changes between brands. What does change it is the form — fine versus coarse, sifted versus settled, softened versus fridge-hard — so if a brand feels noticeably lighter or denser in the hand, weigh a cup of it once and use your own figure.

How should I store a kilogram of corn syrup once it is open?

Airtight container at room temperature, up to 1 year. A kilogram is a large pack for most kitchens, so an airtight container is worth the effort: it keeps moisture out and keeps the cup weight stable over the weeks it takes to use it up.

Does a kilogram of corn syrup weigh the same as a litre of it?

Only if its density is close to water's. A litre is 1,000 ml, and one US cup is 236.6 ml, so a litre is about 4.23 cups by volume. A kilogram of corn syrup is 3.21 cups by weight, which is a different question — the two match only for ingredients whose cup weighs about 237 g. For most ingredients they do not, which is exactly why weight and volume conversions need a density figure.

Related conversions

More conversions for corn syrup, and the tools that do this arithmetic for you: