How much washed yeast do I pitch?

So I washed some yeast couple days ago for the first time. I am very happy with the results. I have them in a small jar that has oz marked on the side and I got a little over 2 oz in there. My question is, is that enough to make 2 starters for 2 batches (1 oz each)? Or should I use it all on one. I would hate to over pitch, but I would also hate to use too much when I could save even more money using it on 2 batches.

 

http://www.mrmalty.com/calc/calc.html

 

This link takes you to a page that just wants you to buy an app for the calculator for $5! I'm one who will not pay for apps if I don't have too. I did a bunch of googling and came up with an idea.

A web page says that thick yeast contains 4.5 billion cells per ml. So for 200 billion cells, you need 44 ml., or 1.48 oz of settled yeast. So I figure that I can use 1 oz of my yeast (135 mil cells) and do a good starter on my stir plate and should be fine, and have another oz to use for another batch.

Sound right?

 

It's free on a comp... They make you pay on an iOS device. Stupid I know.

Here

http://www.brewersfriend.com/yeast-pitch-rate-and-starter-calculator/

 

This is an AWSOME calculator! For yeast and starter vol/gravity. I will be using it a lot. I really like the gravity calculator for the starter. Now I can quit waiting DME. Thank you!!! +1

 

Ya brewers friend has a lot of good tools