Need 70, 80, or 90 on My Final?

“What do I need on my final?” is weighted-average algebra. If your current course percent is C, the final is weight W (as a decimal), and you want overall T:

required final = (T − C × (1 − W)) / W

Not academic advice — verify weights in your syllabus. Curves, drops, and must-pass rules can change the real bar.

Why 70 / 80 / 90 matter

Those targets often map to common letter bands (C / B / A-ish), but your school’s cutoffs may differ. The math is the same; only T changes.

Target overall	Open landing
70%	Need 70 on final
80%	Need 80 on final
90%	Need 90 on final

Each page deep-links into the same local calculator with that target in mind.

Worked example (aim for 80%)

• Current grade C = 76%
• Final weight W = 0.30 (30%)
• Target T = 80

required = (80 − 76 × 0.70) / 0.30
         = (80 − 53.2) / 0.30
         ≈ 89.3%

You need about 89% on the final for an 80% overall. Raise T to 90 and the required score jumps; drop T to 70 and it falls.

When the answer is over 100%

If the formula returns > 100, that target is unreachable with the remaining weight alone (unless bonus credit or a curve exists). Details: final grade needed over 100%. Forward projection (“if I score X…”): if I score X on my final.

Privacy

Course grades stay in your browser. TryCalculatingNow does not upload marks to our servers for processing — useful on shared machines during finals week.

Use TryCalculatingNow

• Hub: What grade do I need on my final?
• Full tool: Final Grade Calculator
• Targets: need 70, need 80, need 90

FAQ

Do I use category weights or only the final %?

Use the final’s share of the course as your syllabus states it. If other categories reweight after the exam, ask your instructor.

Is 89.3% rounded down on the LMS?

Assume not — treat fractional needs as rounding up.

What about a separate pass-on-final rule?

Satisfy both the average target and any must-pass rule — the stricter bar wins. Pass-focused leftover weight: pass mark calculator.