Looked in the yeast section and really couldn’t find the answer to my questions. Hoping they can be answered here.

So I have a smack pack of denny’s favorite 1450. And I want to grow this yeast up before even brewing. Not a yeast starter for one beer. But growth to split between future batches.

So I did a starter with 1.5L starter with 150 grams of dme. The smack pack has 100 billion cells. And looking at mr malty that for a 1.062(I just picked a gravity number to get some figures), than I would need 226 billion cells. And they could be grown with a stir plate and 1L starter.

So what I am getting out, do I get a growth rate of: 225% for a every 1L starter on a stir plate.

Is this correct?

So with my 1.5L starter I will have 337.5 billion cells? Once again, please check my math.

So then I would split and have two containers of 1450 with 168.75 billion cells. Which I would then make actual starters from those two containers for future brews.

And second yeast question? What S.G. do you stop harvesting yeast from? I know I don’t want to take from a 1.080 beer or anything. But how high is really a good stopping point for harvesting?

Thanks a ton. Always appreciate everyones help and knowledge.