How to calculate probit value?

Excuse me, could you please explain in detail how one would go about calculating the probit value? I understand that it's related to statistics and probability, but I'm a bit unclear on the specific steps involved. Would you mind walking me through the process, starting from understanding the concept and then moving on to the actual calculation? Also, are there any tools or software that can assist in making this calculation easier and more accurate? I'm really interested in learning more about this topic and I appreciate your help.