How to test jam

Making homemade jam? Find out how to check that your jam is at the all-important setting point with this video from the Good Food cookery team.

Points to remember

  • The easiest way to test your jam is by using a sugar thermometer, bring the jam to 105C.
  • For an alternate method, put your plate in the freezer for about fifteen minutes before taking it out to test a spoonful of hot jam. Take the jam off the heat while testing.
  • Push your finger through the jam on the plate – you’re looking for it to wrinkle and not flood back in to fill the gap.
  • If it’s not ready, turn the pan back on, simmer for five minutes and test again.

Turn the heat off while you test – you don’t want to overcook the jam if it has set.


Wash your place and pop it back in the freezer if you do need to re-test.