Do I calculate my hatch rate based on the total number of ducklings that hatch in relation to how many were set in the incubator or how many were actually fertilized? Right now I have 24 duck eggs in my incubator. 22 are developing nicely and 2 are clear. I know a lot can change so I probably won't get 22 ducklings out of this but I am just curious how I figure out my hatch rate. I also have my 12 shipped chicken eggs in there but they all came with detatched air cells so I don't have high hopes for them. I did let them rest for 3 days before setting them in hopes that they would do well once set but I have no idea what if anything will come of it.