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Pitch Rate and Growth Calculator Instructions

Wyeast's Pitch Rate and Growth Calculator is a tool for planning a propagation scheme to achieve proper cell counts in the fermenter.  This calculator will calculate for 1 or 2 step propagations.  For more information on propagations, visit the "Making a Starter" section of this site.

First, determine your desired pitch rate (x million cells per ml.) based on the anticipated must and fermentation conditions (for help, see the Pitch Rates section).  Next, fill in the fields on the calculator and press the "Calculate" button.  The pitch rate (total cells/total volume) will be displayed on the calculator.  Adjust the fields to achieve your desired pitch rate.

1 Step Propagation

Step 1 (1) Choose the number of packages. (2) Indicate whether you are using a stir plate. (3) Input the Starter volume. (Volume of Starter Must)

Step 2 (1) Input the final fermentation volume. (Final Volume of Must) (2) Press calculate. (3) Your Final Pitch Rate will be displayed on the bottom line of Step 2.

2 Step Propagation

Step 1 (1) Choose the number of packages. (2) Indicate whether you are using a stir plate. (3) Input the Starter volume. (Volume of Starter Must).

Step 2 (1) Input the volume of must added. (2) Indicate whether you are using a stir plate.

Step 3 (1) Input the final fermentation volume. (Final Volume of Must) (2) Press calculate. (3) Your Final Pitch Rate will be displayed on the bottom line of step 3. 

Example:  Vintner X has 10 gallons of Cabernet must at 24°B. He has determined that he wants to inoculate his must with 4 million cells per ml.  He only has 1 Activator of 4028, Wyeast's Château Red.  He decides to perform the following one step propagation: 1 Activator into 0.5 gallons wort (12°B@70F).  Allow to ferment 24-36 hours.  Add to 10 gallons of must.

 

 

 



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