Egg Hatch Rate & Egg Fertility Rate

Here you'll find the hatch rate explained. It is rather wordy (I suspect to fill the space for the article). If you scroll down fairly far, you will find the formula.

https://cluckin.net/what-percentage-of-chicken-eggs-will-hatch.html

This is the chart I use, that I got from a member on the now defunct Alberta Chickens Etc. (ACE) website. It makes everything clear and it is easy to record more details for viewing later.

Fertility rate is (A-B)÷A. I just record this below "J".