Pitching Rate Question - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Pitching Rate Question

Reply
 
Thread Tools
Old 03-12-2010, 03:00 PM   #1
dennyb
Recipes 
 
Jan 2010
Atlanta
Posts: 3


Hello everyone, I have read the forum for quite some time, but this is my first post.

I will be making a Scotch Ale this weekend with an expected OG of 1.083. I just did the math for the starter and came up with about 295billion cells needed for the pitch. That's close to a gallon of starter for a 5 gallon batch, which just seems excessive to me. I normally brew in the 1.050 to 1.060 range, for which I like to use a one liter starter. If you all would be so kind as to check my math, I just can't imagine dumping a gallon starter in to a 5 gallon batch.

Thanks a bunch.

-Denny



 
Reply With Quote
Old 03-12-2010, 03:17 PM   #2
samc
Recipes 
 
Aug 2008
Portland OR
Posts: 5,387
Liked 62 Times on 58 Posts


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

decant the liquid off the yeast



 
Reply With Quote
Old 03-12-2010, 03:30 PM   #3
wizardofza
 
wizardofza's Avatar
Recipes 
 
Jun 2007
Buffalo, NY
Posts: 383
Liked 3 Times on 2 Posts


Instead of regurgitating the info in the article, this is a great read:

http://www.homebrewersassociation.or...astStarter.pdf

 
Reply With Quote
Old 03-12-2010, 03:43 PM   #4
dennyb
Recipes 
 
Jan 2010
Atlanta
Posts: 3

Awesome, that shows 2.5L which seems more accurate to me. I'll definitely defer to that calculator, but I wonder why it is so different from what I came up with? At a little over half as much volume it seems like I may have some figures wrong, or that my formula is just too riddled with estimates.

I was under the impression that a 2L starter is good to about double the amount of yeast in a vial (to around 200billion cells). Is that just an incorrect constant that I picked up somewhere?

Here are the constants I use to calculate the amount of yeast to pitch:

750,000cells per milliliter of wort.
5gallons = 18,925ml
Deg Plato -->1.082-->(83/4) = 20.75
2L starter will yield 2(original pitch)

 
Reply With Quote
Old 03-12-2010, 03:48 PM   #5
dennyb
Recipes 
 
Jan 2010
Atlanta
Posts: 3

@wizardofza

I have that article, it is that formula that I used to generate the original size of the starter. I'm really just curious as to why it is different.



 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yeast starter? Not your average question - (pitching rate) ekjohns Fermentation & Yeast 1 02-21-2010 05:09 AM
pitching rate question baer19d Fermentation & Yeast 6 11-23-2009 09:14 PM
Pitching Rate BNVince General Techniques 35 08-08-2009 02:09 AM
Pitching rate Tonedef131 Mead Forum 2 05-09-2009 07:56 PM
Increasing pitching rate Proofman General Techniques 1 06-11-2008 06:46 PM


Forum Jump