Ss Brewtech’s Biggest Baddest Holiday Giveaway Ever!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Yeast Overpitch/Underpitch Experiment From a Microbiologist
Thread Tools
Old 01-11-2012, 02:16 PM   #151
Feedback Score: 0 reviews
Join Date: Jul 2009
Location: New York City
Posts: 51

Originally Posted by passedpawn View Post
1 million per ml per °Plato. Maybe less for ales, more for lagers, but that is the number I shoot for.

Unless you mean for your target beer - I'll have to disagree. While this is perfect target for fermenting wort, growing yeast cells needs a much higher pitching rate. So we don't get confused, I'll call the starter pitch rate the "inoculation rate"

For the starter, you want a inoculation rate in the ball park of 5-15 million cells per ml / degree Plato.

For example, in a 1.5 liter starter of 1.036 gravity with a Wyeast pack of 100 billion cells gives you an inoculation rate of:

total cells = inoc rate * mls wort * plato

100 billion = (X) * 1500 mls * 9 Plato

(X) = 7.4 million cells per ml/plato

This will give you a decent yield in the starter.

phattysbox is offline
Reply With Quote
Old 01-11-2012, 03:08 PM   #152
Waste Allocation Load Lifter - Earth Class
Feedback Score: 1 reviews
passedpawn's Avatar
Join Date: Apr 2009
Location: ☼ Clearwater, FL ☼
Posts: 23,061
Liked 5511 Times on 3289 Posts
Likes Given: 4664


Originally Posted by phattysbox View Post
Unless you mean for your target beer
Yes, that's what I meant. Sorry, I didn't read the entire thread.
- Andrew
passedpawn is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
does a bubbling airlock mean I didn't underpitch? BudzAndSudz Fermentation & Yeast 10 10-10-2011 01:36 PM
Underpitch theory Spintab Fermentation & Yeast 14 08-09-2011 01:21 AM
underpitch or stuck ferment? Seanwallner Fermentation & Yeast 17 07-20-2011 06:18 PM
Did I overpitch? fbones24 Fermentation & Yeast 5 02-11-2010 11:32 PM
Did I Overpitch? imperial Fermentation & Yeast 17 02-10-2010 09:12 PM

Forum Jump

Newest Threads