Substitution guide

Glucose Syrup vs Corn Syrup

Glucose syrup ↔ light corn syrup:

1:1by volume

Swap cup for cup, tablespoon for tablespoon. Add a drop of vanilla extract per cup if your recipe is built around American light corn syrup’s added vanilla flavour.

Corn syrup and glucose syrup are near-identical in function — both are made by hydrolysing starch into a syrup that is mostly glucose, used in baking and candy to add moisture and stop sugar crystallising. The difference is the starch source and what gets added afterwards: "corn syrup" is glucose syrup hydrolysed specifically from corn starch, while "glucose syrup" is the general name used when the starch source isn’t specified — in Australia it’s usually made from corn or wheat. American Karo-brand corn syrup also has vanilla (and in the dark version, molasses) added, which plain Australian glucose syrup does not.

Both are noticeably less sweet than table sugar and thicker in texture — a standard 42 DE corn syrup is about 60% as sweet as sucrose, which is why it is used for moisture, body and crystal control rather than as the main sweetener. A higher-DE glucose syrup (e.g. DE 60+) is thinner and sweeter than a lower-DE one; most supermarket corn and glucose syrups sit in a similar DE band, which is part of why the 1:1 swap works.

American recipes say "corn syrup" because that is the only starch source sold there. Australia and the UK sell the same product under its generic name, "glucose syrup", usually made from corn or wheat starch — check the ingredients panel if the source matters to you (e.g. for a wheat allergy).

Compare

Substitutes at a glance

Glucose syrup (AU/UK, plain)1:1 by volume
US light corn syrup1:1 by volume
Dark corn syrup equivalent1:1 by volume + molasses
Golden syrup1:1 by volume
Honey1:1 by volume
  • Glucose syrup (AU/UK, plain): Unflavoured — Australia’s main supermarket brand (Queen) lists only "glucose syrup (from corn), preservative (223)". Add a drop of vanilla if the recipe expects Karo-style flavour.
  • US light corn syrup: Contains added vanilla for "extra smoothness and richness" (Karo). The closest match if a recipe was written and tested with it.
  • Dark corn syrup equivalent: Stir 1 tablespoon of molasses or treacle into each cup of plain glucose syrup to match dark corn syrup’s colour and robust, caramel-edged flavour.
  • Golden syrup: A fine substitute for light corn syrup with a mild caramel note of its own — good in tarts, puddings and chewy bars.
  • Honey: Honey is also an invert sugar and interferes with crystallisation the same way, but it brings its own strong flavour and browns faster — avoid it in hard candy cooked to high temperatures.

Converter

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Enter how much corn syrup your recipe calls for.

= 1 cup Glucose syrup (AU/UK, plain)

Unflavoured — Australia’s main supermarket brand (Queen) lists only "glucose syrup (from corn), preservative (223)". Add a drop of vanilla if the recipe expects Karo-style flavour.

Questions

Frequently asked questions

Are glucose syrup and corn syrup the same thing?
Functionally, yes — both are starch hydrolysed down into a syrup that is mostly glucose. "Corn syrup" specifically comes from corn starch; "glucose syrup" is the generic name used when the starch source isn’t named, which in Australia and the UK is usually corn or wheat. Both are also noticeably less sweet and thicker than table sugar — a standard 42 DE corn syrup is only about 60% as sweet as sucrose — which is the whole point: it adds moisture and body without over-sweetening.
Can I use Australian glucose syrup instead of American corn syrup?
Yes, 1:1 by volume, in both baking and candy. The one gap is flavour: American light corn syrup has added vanilla, which plain Australian glucose syrup doesn’t. Add a drop of vanilla extract if the recipe depends on it.
What is the difference between light and dark corn syrup?
Light corn syrup has vanilla added for a smooth, neutral flavour. Dark corn syrup has molasses added for colour and a more robust, slightly bitter edge. To mimic dark corn syrup with plain glucose syrup, stir in about a tablespoon of molasses per cup.
Does glucose syrup work in candy making the same as corn syrup?
Yes — in fudge, caramel and toffee, both work as an "interfering agent" that physically blocks sugar molecules from forming crystals, giving a smooth rather than grainy set. The swap is 1:1 regardless of which starch the syrup came from.
Can I buy corn syrup in Australia?
It is uncommon on Australian supermarket shelves — glucose syrup (Queen is the major brand, made from corn) is the everyday equivalent and the one worth stocking instead.

More conversions

Thickened CreamCups to grams guideml to cups guide

Sources: Karo Syrup — Frequently Asked Questions (manufacturer, light vs dark corn syrup, added vanilla); Queen Glucose Syrup 500g — ingredients list (Coles, Australian retail); King Arthur Baking — sugar alternatives (golden syrup/glucose syrup/treacle as corn syrup substitutes); Exploratorium — Science of Cooking: Fudge (corn syrup/glucose as a crystallisation-interfering agent); CandyMentor — Glucose Syrup (42 DE corn syrup ≈ 60% as sweet as sucrose; DE explained)