Yeast question

[dbeer22]

I am going to be moving from 5 gallon batches to 10 gallon batches. Can I just do a starter with a single package, vial, recycled yeast? If so how big of a starter do I need? Most of my beers are around 1.050 og thanks

 

[COLObrewer]

Mrmalty says about 3 liters, but it depends on alot of stuff. http://www.mrmalty.com/calc/calc.html