What score do I need on a final worth 20% to pass with a 70?

It depends on your current grade. From a 72, the needed score is (70 − 72 × 0.8) ÷ 0.2 = 62. From a 65, the same setup needs (70 − 65 × 0.8) ÷ 0.2 = 90 — every current-grade point is worth four needed-score points at a 20% weight.

What does a needed score over 100 mean?

The target cannot be reached with the final alone — a 160 means even a perfect exam falls far short. Check the syllabus for extra credit, drop-lowest, or replacement policies, and check the registrar's calendar for withdrawal options before the deadline.

If the needed score is negative, can I skip the final?

The math says the target is already locked in, but syllabi often impose separate conditions — minimum final-exam scores, attendance rules, or penalties for unexcused absences — that the weighted average cannot see. Confirm the policy before deciding.

Is 60 or 70 the passing grade?

Both conventions exist. A D (often 60–69) earns credit in many U.S. courses, but majors, prerequisites, and transfer agreements frequently require a C or better. Use the threshold from your own institution's grading policy as the target.

Guides

What grade do I need on my final exam to pass?

By GradeLab · Published June 10, 2026 · Updated June 10, 2026

Solve the weighted average for the final's score — with a 72 going into a final worth 20% of the course grade, passing at 70 takes a 62 on the final, because the 72 you already hold carries 57.6 of the 70 points you need.

The passing question, turned into arithmetic

Your course grade after the final is a weighted blend of two numbers: everything you have earned so far, and the final exam itself. If the final counts for 20% of the grade, the current grade supplies the other 80%. Setting that blend equal to the passing threshold and solving for the final's score gives the formula: needed score = (target − current × (1 − weight)) ÷ weight, with the weight written as a decimal.

Worked through for a typical case: a 72 average, a 70 passing line, and a final worth 20%. The current work contributes 72 × 0.80 = 57.6 points toward the threshold, leaving 70 − 57.6 = 12.4 points for the final to supply. Dividing by the 0.20 weight gives 12.4 ÷ 0.20 = 62 — a 62 on the final passes the course. Being above the passing line going in means the final can absorb a below-target score and still land safely.

When it's tight: a 98.33 is still a yes, barely

Now flip the situation: a 65 average, the same 70 target, and a final worth 15% of the grade. The work so far supplies 65 × 0.85 = 55.25 points, the final must produce the remaining 14.75, and dividing by 0.15 gives a needed score of 98.33. That is achievable on paper — a near-perfect exam — but it is a plan with no margin for one bad question.

A needed score in the high nineties is a signal to act before exam day, not just study harder. Anything that lifts the current grade — outstanding homework, regrade requests, an offered extra-credit assignment — lowers the needed score on the heavier-weighted side of the equation. Raising the current 65 to a 67 drops the required final score by more than 11 points, because every current-grade point is multiplied by 0.85 ÷ 0.15 in this configuration.

When the final alone cannot get you there

Suppose the average going in is a 60, the passing line is 70, and the final is worth only 10% of the grade. The formula returns (70 − 60 × 0.90) ÷ 0.10 = 160 — the calculator reports the number above 100 rather than capping it, because 160 itself is the answer: not possible on the strength of the final, even with a perfect paper. No quantity of studying changes that arithmetic; the remaining options live in the syllabus, the instructor's policies, or the registrar's withdrawal deadlines.

The same starting grade with a heavier final tells a different story. Keep the 60 average and 70 target but make the final worth 40%, and the needed score falls to (70 − 60 × 0.60) ÷ 0.40 = 85 — hard, but a real target. The final's weight is pure leverage: a heavy final makes rescues possible and safe grades fragile, while a light one mostly locks in whatever the semester has already decided.

The pleasant surprise: a negative needed score

Run the formula with a 95 average, a 70 target, and a final worth 25%, and the needed score comes back as −5. A negative answer means the target is already secured: the 95 × 0.75 = 71.25 points banked before the exam exceed the 70-point threshold on their own, so even a zero on the final passes.

A negative needed score is information, not permission to skip the exam. Many syllabi attach conditions the weighted average cannot see — a minimum score on the final required to pass the course, attendance rules, or a policy that an unexcused missed exam triggers an incomplete or failure regardless of the average. Read the syllabus before acting on the math, and use the number as license to spend scarce study hours on a course where the final still matters.

Know your actual passing threshold before you solve for it

Everything above assumed passing means 70, but the threshold is itself a policy choice that varies. At many U.S. institutions a D — often anything at or above 60 — earns credit, while a C or higher is commonly required for courses in a major, for prerequisites, or for transfer credit. Pass/fail and credit/no-credit enrollments draw the line differently again, and graduate programs typically set it higher. The right number to put in the target field comes from your school's grading policy, not from convention.

This calculator is weighted-average arithmetic on the numbers you enter — it is exact for those inputs and silent about everything else. Weights, rounding at letter boundaries, drop-lowest rules, and replacement policies all belong to your instructor and registrar. When the result sits close to a line that matters for credit, a scholarship, or a program requirement, confirm the inputs against the syllabus and, if anything is ambiguous, ask the instructor while there is still time to act on the answer.

Questions

What score do I need on a final worth 20% to pass with a 70?: It depends on your current grade. From a 72, the needed score is (70 − 72 × 0.8) ÷ 0.2 = 62. From a 65, the same setup needs (70 − 65 × 0.8) ÷ 0.2 = 90 — every current-grade point is worth four needed-score points at a 20% weight.
What does a needed score over 100 mean?: The target cannot be reached with the final alone — a 160 means even a perfect exam falls far short. Check the syllabus for extra credit, drop-lowest, or replacement policies, and check the registrar's calendar for withdrawal options before the deadline.
If the needed score is negative, can I skip the final?: The math says the target is already locked in, but syllabi often impose separate conditions — minimum final-exam scores, attendance rules, or penalties for unexcused absences — that the weighted average cannot see. Confirm the policy before deciding.
Is 60 or 70 the passing grade?: Both conventions exist. A D (often 60–69) earns credit in many U.S. courses, but majors, prerequisites, and transfer agreements frequently require a C or better. Use the threshold from your own institution's grading policy as the target.