can you add too much yeast?

[MrVix]

I brewed a 2 1/2 gallon half batch yesterday. Without thinking I pitched the same amount of yeast that I would for a full 5 gallon batch. Is that gonna be ok. Can you add too much yeast?

 

[Dan]

You can but you probably didn't.

Take a look at these two yeast calculators. I personally like the first but many others swear by the second one.

Yeast Calculator http://yeastcalc.com/

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

 

[Rbeckett]

It is possible to over pitch, but if using dry yeast and just doubling from 2.5 to 5 gallon packet you should be fine. Some yeasts are more aggressive than others but that isn't too much to make a taste or fermentation difference this time.
Wheelchair Bob