Originally Posted by Sonnyjim
I have a standard pack of Irish Ale Activator. 100 billion yeast cells. No need for a starter?
I would make a starter. It's a good habit to get into. Like it was already said, use Mr. Malty.
Not knowing your OG, even if it's 50, Mr. Malty says you need 175 billion cells, almost two packs(1.8). I am inputting this using today's date with the yeast and assuming your yeast is a couple of weeks old that would mean you would need even more than 1.8 packs.
Another reason for a starter is just to know its viable. I make a starter for all liquid and washed yeast no matter how low the starting gravity is.
If you are a relatively new brewer, its better to have good brewing habits instead of trying to cut corners.IMO.