Let us run through an example of calculating the pitching rate for 12 °P ale wort. Since it is an ale wort, we will use a rate of 0.75. Multiply your pitching rate (0.75) by the specific gravity of the wort in Plato (12) to determine how many million cells you want per milliliter of wort. In this example you want 9 million cells per milliliter. Cells per milliliter (cells/ml) becomes your standard unit of measure. You then multiply that number (9 million cells/ml) by the volume of wort (in milliliters), to determine the total number of cells to pitch. If this is a 5.3-gallon (20 L) batch of
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