“There are a lot of great yeast calculators out there like mrmaltythat tell you how much dry or liquid yeast is needed and whether or not a simple starter should be used.
A free calculator that we have grown very fond of lately expands this recommendation to include “stepping” up the starter over a period time. This allows you to better estimate how much yeast you will have when the starter is finished.
It’s called YeastCalc! Happy yeast growing!”