How do I calculate my cumulative GPA from multiple schools?

I took five post-bacc courses this year and I’m trying to calculate how it affects my cumulative GPA.

My GPA from my undergraduate institution is a 2.42 (yeah…), with 133 hours and 322.69 quality points.

I took two online courses at Harvard Extension School, each worth 4 credits for a total of 8. I took three courses at Rutgers University, worth a total of 11 credits. I got an A in all five courses, so that’s 19 credit hours and 76 quality points right?

And to calculate my cumulative GPA is it (322.69 + 76) / (133 + 19) = 2.62?

Is this correct, and is it how every graduate school will calculate my cumulative GPA?

Your GPA is your undergraduate GPA. Post-bac courses will not alter that. These will be looked at separately as additional information, don’t try computing an overall GPA.