I have a packet of SafLager S-189 from Fermentis and I'm trying to figure out how many sells are in it. The packet is 11.5 gram and the expiration date is 04/2021 (which, I think, means it's 14 months old, as Fermentis gives their dry yeast a 36 months stated shelf life). Reading BeerSmith's guide: http://beersmith.com/blog/2011/01/10/yeast-starters-for-home-brewing-beer-part-2/ I see that they say that an 11.5 packet should contain about 200 Billion cells. However, looking at the product datasheet in the company's website: https://fermentis.com/wp-content/uploads/2018/08/SafLager-S-189_Rev1.pdf I see they only claim more than 6 Billion per gram, which only means more than 70 Billion for the entire packet. I'm guessing Fermentis's number is a minimum estimate, to make sure they deliver on their promises, but which is more realistic? What number can I comfortably assume here?