How many yeast cells are in a 5 g batch :-)

[Grinder12000]

Just writing an article and curious. Has anyone ever estimated???

 

[flyangler18]

Too many variables. It's dependent on initial yeast health, aeration rates, OG of the wort they are put into, # of cells initially pitched via a starter (see Mr Malty).

 

[Orfy]

This may be relevant.I spotted a section that talks about cells/ml at at a % of alcohol.
I'm afraid I'm not really interested enough to read or study it but it may help those who are.

 

[944play]

Using MrMalty's numbers, I'm going to say "on the order of one trillion."
5.25 gallons of 1.13 OG lager calls for a 20L simple starter with O2 at start with 2 liquid yeast packs at 99% viability to make 900 billion cells.

 

[Orfy]

5.25 gallon needs a 20L starter?
Is that a typo?

20L is around 5.25 gallon.

 

[cubbies]

Well, if memory serves me correctly, a liquid yeast pack grown with a starter will have about 225 billion cells at pitching time. However, they then go through another growth phase. I would not be surprised to see it double. So my very uneducated guess is somewhere around 400-500 billion.

 

[flyangler18]

5.25 gallon needs a 20L starter?
Is that a typo?

20L is around 5.25 gallon.

Orfy, I think it is correct if we assume a couple of things. The slower generation time of lager yeast compared to ale yeast (all things equal), the OG of the target wort, and the fact that a simple starter (non-agitated) is going to simply ferment rather than get the yeast into a strong growth phase by the presence of oxygen. Another strong mathematical case for a stir-plate.

 

[remilard]

I think he was just jacking up the og on the calculator until it called for a 5 gallon starter, then the calculator would tell him how much yeast is in the 5 gallon starter.

 

[flyangler18]

Hey I already answered this! Either didn't post or got deleted. Anyway, there are 37 cells of yeast in a 5G batch. :cross:

Your original post was deleted (as were a couple others); let's try and keep the conversation on topic.

I'm all for banter here and then, but threads just explode into a giant pile of poo too quickly.

Jason

 

[Orfy]

I think he was just jacking up the og on the calculator until it called for a 5 gallon starter, then the calculator would tell him how much yeast is in the 5 gallon starter.

I need a light bulb smiley! Got it.

It was for illustration purposes only.