Homebrewing Stack Exchange is a question and answer site for dedicated home brewers and serious enthusiasts. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Did a brew yesterday, hit the desired SG after the boil time - or so I thought. After cooling the wort, the SG dropped 2 points. What would cause this?

share|improve this question

Your hydrometer has been calibrated to give readings at a specific temperature. Depending on the temp when you first read it and the temp after cooling a two point difference is not that surprising.

If you look closely at the hydrometer, it will tell you the calibration temperature of your hydrometer. They are normally done somewhere around 60, 65 or 68F.

There are hydrometer correction tables/tools available online to help with this in the future so you don't have to wait for the sample to cool. Like this one at Brewers Friend.

share|improve this answer
Don't forget to take the temperature when you measure gravity. Or better yet, chill your sample to the temp for your hydrometer, 65° for example. – Dave Baghdanov Feb 19 '14 at 19:44

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.