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Old 08-28-2014, 01:14 PM   #1
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Default How much yeast starter to use?

Getting conflicting information on the size of a yeast starter using White Lab's WPL 0001. Making 5 gal batch imperial IPA at 10%. White Labs says use 2 pints / 1000 ml but then has a video showing to make 1500 ml. BeerSmith says to make 2 quarts / 2000 ml. The point is to grow yeast cells. Will either volume work?

Made 1000 ml on stir plate last night and will pitch today,

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Old 08-28-2014, 01:20 PM   #2
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For 10% beersmith sounds closer. Check yeastcalculator.com which I find easier and more precise. If you're pitching today though the point may be moot for this brew day.

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Old 08-28-2014, 01:25 PM   #3
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Use a yeast pitch rate calculator as Hello said. The size of starter is meaningless unless the viability of the yeast is figured in.

Yeast with 20% viability will not propagate the same number of cells in a one liter starter as will be propagated with yeast at 90% viability.

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Old 08-29-2014, 12:32 AM   #4
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Thank, will use the yeast calculator next time. The White Labs yeast package had an expiration date of Dec 4, 2014. Don't know when the yeast was made or the viability. The yeast calculator looked a bit daunting but can see how knowing the viability will help you reach the yeast cells you need for the beer you are making.

As I said before, White Labs said to use a 1000 ml ( 1 quart ) starter. Beer Smith said to use a 2 qt ( about 2000 ml ). What I missed in the BS yeast volume, not viability, calculator was the following:

The beer I am making needs 383 billion cells. With a 1000 ml starter you get 226 billion cells. With a 2000 ml starter you get 360 billion cells. I have a 2000 ml flask so will use the yeast calculator next time

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Old 08-29-2014, 12:40 AM   #5
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Quote:
The White Labs yeast package had an expiration date of Dec 4, 2014. Don't know when the yeast was made or the viability
The manufacture date for White Labs is 4 months prior to the vial date stamp.
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