So do you do starters with your dry yeast? How do you calculate your yeast counts? Thanks for the reply.
Dry yeast packs generally don't benefit as much from starters, for one, it's often not as much of a savings to do a starter vs buying another pack of yeast if needed. I believe Mr. Malty has posted counts for dry yeast by gram, I don't remember the number off the top of my head, but make sure to properly rehydrate the yeast.
Regarding your initial starter question, the rule of thumb I follow is that 1 liquid package has ~100 bil yeast. 1 package in 2L starter will double in cells to ~200 bil, but if you just switch out the wort, you won't get a doubling, instead you will end up with ~300 bil cells. I base this on the chart in Yeast