How to calculate cumulative GPA? Do you include grades you took after BA?

[gk8]

Hey everyone. I am having a difficult time figuring out my cumulative GPA. In an information session, the program said that I have to include all the classes I have taken after my BA. I am currently takin classes at a CC. I have taken a few that relate to social work. Would I just have to calculate it until it gets to 60 units? Is there a specific website?

I have contacted the MSW program  but haven't heard back. I also contacted my undergrad university and asked if my cumulative GPA would change if I sent my transcripts from a CC and they said no because I already graduated. TIA.