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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Yeast Overpitch/Underpitch Experiment From a Microbiologist
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Old 01-11-2012, 02:16 PM   #151
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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.
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Old 01-11-2012, 03:08 PM   #152
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Unless you mean for your target beer
Yes, that's what I meant. Sorry, I didn't read the entire thread.
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