cells needed (750,000) x (20,000) x (12) = 180,000,000,000 In this example, you would need 180 billion cells to pitch your homebrew batch at a rate of 0.75 million. What if it was a 10-hectoliter commercial batch instead? (750,000) x (1,000,000) x (12) = 9,000,000,000,000 Now you need to measure out the appropriate amount of yeast. Typically, yeast slurries are in the range of 1 billion to 3 billion cells per milliliter, but it depends on how they were collected. If you have done a cell count, then you will have a good idea of the density; otherwise you will need to estimate.
