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Old 09-08-2012, 11:58 PM   #1
Sea-Wolf
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Jul 2012
North, Country
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How, using a 5 gallon recipe, would I determine how much yeast is necessary for a 2.5 gallon brew? I am trying to cut 5 gallon recipes in half in an effort to experiment with different brew recipes and adjuncts without committing to a full five gallon experimental beer.

Thanks, in advance, for the help!
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Old 09-09-2012, 12:20 AM   #2
lumpher
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texas
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i'd use dry yeast, if possible, so you could use 1/2 a pack. otherwise, if you use liquid yeast, try to do 2 2.5's at the same time that use the same yeast. liquid yeast doesn't do so good after opening and sitting unless you use harvesting techniques
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Old 09-09-2012, 12:33 AM   #3
DrewF
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Aug 2010
PA
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There are some online calculators that will tell you pitching rates with batch size as a variable. I use this one:

http://www.mrmalty.com/calc/calc.html

 
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Old 09-09-2012, 02:29 AM   #4
Sea-Wolf
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Jul 2012
North, Country
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Great, thanks for the responses!

I will definitely be using the link provided.

Also, I considered using the "half-pack" idea, so I'm glad to see someone else suggest it. I'll be using that for sure.
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Old 09-09-2012, 08:11 AM   #5
tektonjp
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Nov 2010
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Were you drinking before you tried the math?
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Old 09-09-2012, 02:50 PM   #6
crocks86
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Apr 2012
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I've been brewing 2.5 gallon batches all summer, going by the mr.malty numbers in general one full smack pack has been perfect for most of my batches, even had to make a starter for a couple.

Since the required amount is usually about 750000 yeast cells per ml times gravity points it ends up being close to the 100 billion cells in a smack pack for anything over 1.050 or so.

 
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Old 09-09-2012, 03:28 PM   #7
eanmcnulty
 
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I brew 3g batches, and I generally use half a dry yeast packet or one whole smack pack.
If I'm making a huge stout (9-11%) I use a whole dry packet or even two smack packs. For that, it would makes more sense to make a starter.
I love small batches: easy to clean up, easy to lift the fermenter ( I'm a weakling), bottling only 24 12oz. Bottles.
A problem has arisen with my Zombie Dust clone. There just isn't enough, and I think it may be time to brew a full five gallons. It is awesome beer.
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Old 09-11-2012, 12:19 AM   #8
wiggybrewer
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Mar 2012
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Pitch half a smack pack, and make a starter with the other half for your next batch. Or just pitch one full packet of dry yeast without rehydating it.

 
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Old 09-11-2012, 12:25 AM   #9
downtown3641
 
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Quote:
Originally Posted by wiggybrewer
Pitch half a smack pack, and make a starter with the other half for your next batch. Or just pitch one full packet of dry yeast without rehydating it.
No. Why would you pitch half a package of liquid yeast but an entire package of dry yeast when an entire package of liquid yeast has a lower cell count than a package of dry yeast?

Check mrmalty.com. I suspect you'll find that an entire package of liquid yeast is about right for a 2.5 gallon batch.
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Old 09-11-2012, 03:17 AM   #10
eanmcnulty
 
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Quote:
Originally Posted by downtown3641

No. Why would you pitch half a package of liquid yeast but an entire package of dry yeast when an entire package of liquid yeast has a lower cell count than a package of dry yeast?

Check mrmalty.com. I suspect you'll find that an entire package of liquid yeast is about right for a 2.5 gallon batch.
This is correct.
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