Jam sugar is granulated sugar that already has pectin (and usually a bit of citric acid) mixed into it so that jams and jellies set firmly without needing extra setting agents.

What is jam sugar?

  • Jam sugar (also called gelling sugar or pectin sugar) is regular white sugar with added pectin, the natural gelling agent that makes jam thick rather than runny.
  • It often includes citric acid too, which helps the jam set and acts as a mild preservative.
  • It is designed specifically for making jams, jellies, and marmalades, especially from fruits that are naturally low in pectin (like strawberries, cherries, or peaches).

How it differs from normal sugar

  • Normal granulated sugar is just sucrose, with no added pectin or acid, so you usually need to add bottled or powdered pectin separately when making jam.
  • Jam sugar simplifies the process by combining sugar and pectin in a single product, so you usually just add fruit and boil to reach the setting point.

Typical ingredients and ratios

  • Core components: sugar, pectin, and citric acid; some brands may also add sorbic acid or sodium benzoate as preservatives.
  • In Europe, you’ll often see packets labeled 1:1, 2:1, or 3:1, which indicate the ratio of fruit to jam sugar by weight (for example, 2:1 means twice as much fruit as jam sugar).
  • There are also low-sugar or sugar-free “jam sugars” that use sweeteners such as erythritol and stevia plus special low-methoxyl pectin to gel with less actual sugar.

Where jam sugar is common

  • Jam sugar is widely sold and used in Europe, as well as in places like South Africa, Australia, and New Zealand.
  • In North America, recipes more often use plain sugar plus a separate commercial pectin product, but you can find similar blends under names like “pectin sugar” or “gelling sugar.”

Quick example: using jam sugar

  • For a simple strawberry jam, you would mix chopped strawberries with jam sugar in the ratio printed on the packet (often 1:1 by weight), bring to a rolling boil for a few minutes, then test and bottle once it thickens and reaches the set point.

Information gathered from public forums or data available on the internet and portrayed here.