What Grade Do I Need on My Final?
Three scenarios cover nearly every student.
What you need on the final depends on your current grade, your goal, and the final's weight: (goal - current x (1 - weight)) / weight. Protecting a 92 with a 93 goal and a 20 percent final needs (93 - 92 x 0.8) / 0.2 = 97. Rescuing an 80 from a 78 with a 25 percent final needs 86. Needing over 100 means the goal is out of reach without extra credit.
Scenario 1: protecting a grade
You hold a 92 and want to keep an A at 93 with a 20 percent final. The math says (93 - 73.6) / 0.2 = 97. You need a 97, which is demanding but possible with focused review.
The protection play is to study the heavily tested topics first and bank partial credit everywhere. You do not need perfection, you need 97, so plan where the points come from.
Scenario 2: rescuing a grade
You hold a 78 and need an 80 with a 25 percent final. (80 - 58.5) / 0.25 = 86. One strong exam erases a shaky semester, which is exactly what finals are for.
The rescue play is triage: master the highest-yield material, skip the rabbit holes, and make sure every easy point is actually easy for you on exam day.
Scenario 3: the math says no
Holding 85, wanting 90, with a 20 percent final demands 110. No exam performance fixes this, and knowing that now beats learning it after the test.
The move is to change the inputs you can still change: extra credit, a curve policy, or a revised target. Ask the instructor what levers exist before exam week.
Skip the arithmetic
Run your own scenario on the calculator.
Final grade scenario questions
What do I need on my final to keep an A?
With a 92 average, a 93 goal, and a 20 percent final, you need a 97. Plug your own three numbers into the calculator for your exact target.
Can one final save a bad semester?
If the gap is small and the final is heavy, yes. A 78 needing an 80 with a 25 percent final needs an 86, which is very achievable. A 10-point gap with a 10 percent final is a different story.
What should I do if I need over 100%?
A required score above 100 means the goal cannot happen on the final alone. Talk to your instructor about extra credit or curving before the exam, and set a backup target you can actually hit.