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Calculate equal-weight test averages with different totals and missing scores in Excel

Hello, I’m a teacher trying to build a gradebook in Excel to track student test scores, but I’m struggling to calculate the overall grade correctly.

I will have around 12 tests throughout the year, and each test has a different total number of marks (e.g., some out of 10, some out of 20, etc.).

What I need:

  • Each test should contribute equally to the student’s final grade, regardless of its total marks (e.g., 8/10 and 16/20 should be treated as equal performance)
  • Missing tests (blank cells) should be ignored and not counted as 0
  • The final result should be a percentage that updates automatically

Current setup:

  • Columns F onward = individual tests (Lesson 1, Lesson 2, etc.)
  • Row 3 = total marks for each test
  • Student scores are entered in each row
  • Column E is intended to show each student’s overall percentage

Issues encountered:

  • I've tried using =SUM(scores)/SUM(totals) but it creates a weighted average based on total points, which I do not want
  • Whe I used formulas like AVERAGE(F6/F$3, ...) or AVERAGEIF it causes errors:
    • #DIV/0! when totals or scores are blank
    • #VALUE! when combining IF or array formulas
  • Excel (Korean version) does not seem to support range division like F6:O6 / F$3:O$3 Or if it does, I can't wrap my head around how to make them work.

Goal:

  • A formula that converts each score to a percentage, averages them equally, ignores blanks, and can be filled down for all students
  • I would prefer not to add extra rows per student, but a helper column is fine

Optional:

  • A way to calculate the class average (row 5) from these results

Screenshots of my current setup are included for reference. My excel is stuck in Korean though and I can't change it due to my administration permissions. I don't speak Korean either!

Thank you in advance for any help.

https://preview.redd.it/aj4buc6q85qg1.png?width=1080&format=png&auto=webp&s=ddcf91502c137ce5b1fb54b415277365698908d9

https://preview.redd.it/o9jy7m2r85qg1.png?width=892&format=png&auto=webp&s=32ccfbba0596fd88e3fa0763a221da35f338781c

https://preview.redd.it/q6klh5mr85qg1.png?width=697&format=png&auto=webp&s=2cf6a8dfa5988fbf81b217c92203452cf73a1ce9

https://preview.redd.it/n3rx5j5s85qg1.png?width=947&format=png&auto=webp&s=9e8404240303cd7acbb891c85b649d76eb898f82

https://preview.redd.it/tvt8aiqs85qg1.png?width=1080&format=png&auto=webp&s=6ca90e08017781e8200ffb3aa340abab26c5d735

submitted by /u/Puzzleheaded-Bag8904
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