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Home Brew Forums > Home Brewing Beer > Extract Brewing > When to take OG reading?
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Old 01-03-2008, 02:57 PM   #1
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Default When to take OG reading?

When doing an 5 gal extract batch with the 1 1/2 to 2 gallon boil. Do you check the OG then (at end of the boil, with wort cooled) or after you have topped off with water in the fermenter?


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Old 01-03-2008, 02:59 PM   #2
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Take the OG reading after you have added the top-off water and mixed it well with the wort. I take my reading right before I pitch my yeast so everything is pretty much done at that point.

If you take the reading without the top-off water it will be ridiculously high.


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Old 01-03-2008, 03:00 PM   #3
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And be sure to mix very well or your reading will not be accurate.
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Old 01-03-2008, 03:03 PM   #4
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+1 on the mix VERY well. I don't even want to talk about how frustrating it was before I figured that out.
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Old 01-03-2008, 03:05 PM   #5
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Thanks guys for the quick repsonse.
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Old 01-03-2008, 03:18 PM   #6
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Or, don't even bother.

It's darn near impossible to miss your OG on an extract brew, unless you forget some extract or your volumes are off.

If you didn't leave out any extract, and you're confident in your fermenter volume, your OG is what the recipe said it should be.

You'll have one more hydrometer-sample's worth of beer to taste AFTER the fermentation
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Old 03-06-2011, 06:12 PM   #7
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Sort of a thread revival here but wondering if anyone had thoughts on how accurate your hydro reading will be if you take a gravity reading straight from the kettle right after I removed my chiller with no mixing yet?
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Old 03-06-2011, 06:23 PM   #8
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Quote:
Originally Posted by tnbrewer371 View Post
Sort of a thread revival here but wondering if anyone had thoughts on how accurate your hydro reading will be if you take a gravity reading straight from the kettle right after I removed my chiller with no mixing yet?
It depends. If you are adding water afterwards, then of course the OG of the boiled wort would be very high and completely inaccurate. You also have to know the exact volume- not 3 gallons left, but 2.65 for example.

If you're doing a full boil with all of the wort, and you know the exact volume left in the kettle, it'll be highly accurate.
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Old 03-06-2011, 06:29 PM   #9
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Well that for sure answers my question, it was a full boiland actually was a litltle low on volume I think, bummer, thanks as always yooper. To be honest my og was dead on as planned for my efficiency I planned for but I was about a full gallon shy post boil, guess I didn't get the efficiency at all I had planned for. Oh well try again next time.
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Old 06-11-2012, 09:42 PM   #10
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I forgot to take the OG reading until after I aerated the wort and pitched the yeast. Will the reading still be accurate? I presume with more air in it, the density will be lighter than expected. Thanks


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