Hi Parents,
what is the right way to calculate unweighted GPA? is it using formula1 or formula2?
If both are not correct, then can you please guide.
If following are the credits and grades
A= 4.0 and A- = 3.7 conversion
Grade Credit formula1 formula 2
A 1 4 4
A 1 4 4
A 1 4 4
A 0.5 2 4
A- 0.5 1.85 3.7
A 1 4 4
A 1 4 4
A 1 4 4
A 1 4 4
total from formula1 = 31.85 / 8 credits = 3.98125
total from formula2 = 35.7 /9 credits or courses= 3.966
The real right way is to take it off the transcript. Hopefully the transcript follows Formula 1, since one needs to account for the credit each course receives.
@learning19
There are hundreds of ways to calculate unweighted (and weighted) GPA. Fact is…schools use their own formulas…and you need to know what YOUR school uses…so ask.
A 3.96 and a 3.98 GPA really are about the same…
Why do you want to know this? Is this to determine class Val or Sal?
Thank you @skieurope.
@thumper1 ,
some job application asked for unweighted GPA. But D’s school only gives weighted GPA.
So trying to calculate the unweighted GPA.
Even so…there are hundreds of ways to calculate GPA. You need to know the course credit plus the value given to the grade. Some places count pluses and minus grades and some don’t. For some places, A is 4, B 3. Etc. at others A is 4, B is 3.25.
Schools assign their own values.
Here…try this…or do. Google search and see if there is anything easier.
https://www.omnicalculator.com/other/high-school-gpa
Which the OP gave. I know it’s hard to tell because this site does not do tables well, but the OP listed courses of 1.0 and 0.5 credits (and depending on the school, there could be 0.25, etc.) and gave the scale where A = 4.0, A- = 3.7, etc.
Unlike college applications where precision matters, a job application for a HS student falls into the “close enough” category. I would not spend too much time on the calculations. 
There may be many ways to calculate an unweighted GPA, but all but one of them would be in the vast, vast minority, IME. Weighted GPA is a mess of approaches, but unweighted is pretty straightforward/standard.
Yes, a course that only meets for 1/2 of the year only receives half the weight of a full year course. Similarly, a lab course that meets 5 periods plus 2 lab periods a week is weighted by 1.4
The table provided is a bit of a mess, but it appear that the 4th and 5th courses were 1/2 year courses, so adding up the 3rd column and dividing by the 2nd column total would be accurate - formula 1.
No! to labs necessarily getting less weight than lecture classes. The school will assign the credits to every course. Do not assume any formulas. My college chemistry classes varied in hours per week for a given number of credits, labs/lectures and/or discussions. HS is straight forward.
College courses are , of course, unweighted and assigned a number of credits by a school. The number of hours spent in the lab can vary, but the transcript will show credits, not hours. The school will assign points to +/- and other qualifiers (eg A/B).
HS is where grade weighting can occur. A semester course is half of one year, a full year course is one year. For block scheduling ask your school how many credits are assigned to a given course.
The gpa will be straight forward. Multiply the credit (1 or 1/2) times the point value (using A=4, add/subtract 0.3 for +/-). Then add up all of those numbers and divide by the total number of credits.
OP- I have no idea where your list of numbers comes from. Looked bizarre to me.
As others have pointed out, it is formula 1. sum(gradei * crediti) / sum(crediti), where i iterates over each class, crediti is the number of credits for that class, and gradei is the point value of the grade for that class. Your third column is the value gradei * credit_i, so that is the correct calculation.
Note that this is the standard formula for a weighted mean, where the weights here are the credits. Your formula 2 corresponds to the case where we ignore the weights, or treat them as all equal.
Anecdote:
My daughter went to one school for 9-10th grades with 0-100 grading. Then she went to another and did an IB Diploma for 11-12th grades which is 0-7. Never knew what her 4.0 scale GPA was…colleges figure it out. The only time there was an issue was for our State Flagship which auto-awards scholarships based on GPAs , but a quick email sorted that out. So send your transcript and the college will figure it out.
Apparently the me for this poster is to provide an unweighted GPA for some job application.
That being the case, I think I would just do the best I could to estimate.