Is this enough yeast? (pic)

[P_Bio]

I am trying to grow a yeast starter from Bell's amber ale to use for a two hearted clone. I've done the following:

Between each step I cold crashed and decanted the spent wort

4 beers 10% in 250ml wort 1.02 for 3 days
500 ml 1.02 2 days
1L 1.03 2 days
1.5L 1.04 2 days

In the 1.03 and 1.04 you can see the flask would overflow with fermentation, so I know the yeast are very healthy. I'm just not sure if I have enough for a 5 gallon batch. I've never done this and I really don't want to under pitch. Thoughts?

 

[adixon3]

Depends on your OG

 

[P_Bio]

Starting OG is going to be about 1.065 which calls for around 350 billion yeast. I'm just not sure how much 350 billion looks like.

 

[GuldTuborg]

There's a tool on the mrmalty calc to help with that. It's going to estimate better than any of us can by looking at a pic.