Final Grade Calculator — what you need on your final exam

Both modes rest on one definition — the weighted mean from the NIST/SEMATECH e-Handbook of Statistical Methods: weighted mean = Σ(wᵢ·xᵢ) / Σ(wᵢ). Your course grade is a weighted mean of its parts, so every number here is exact algebra — there are no estimated rates or opinions anywhere in the tool.

Grade needed on the final. Let C be your current grade, T your target overall, and w the final's weight as a fraction (30% → 0.30). The completed coursework counts for the (1 − w) share, so your overall after the final is Overall = C·(1 − w) + F·w. Setting Overall = T and solving for the final score F gives the formula the tool uses:

F = (T − C·(1 − w)) / w

From the same equation it also reports the two bounds that matter: your guaranteed overall if you score zero on the final (C·(1 − w)) and your best possible overall if you ace it (C·(1 − w) + 100·w). A required final of 100% or less is reachable; 100–150% needs extra credit; above 150% (or a negative number, meaning you have already secured the target) is flagged so you never chase an impossible mark.

Weighted grade from components. For assessments with scores sᵢ and weights wᵢ, the overall is Σ(sᵢ·wᵢ) / Σ(wᵢ). When your weights don't yet add up to 100% — because the final isn't graded — the tool finds the remaining weight R = 100 − Σwᵢ and, given a target T, the score you need across it: Sneeded = (100·T − Σ(sᵢ·wᵢ)) / R. Every answer is verified by running the weighted mean forwards, so the number the tool shows always reproduces your target to the decimal.

• NIST/SEMATECH e-Handbook of Statistical Methods — Weighted mean
• Encyclopaedia Britannica — Mean and weighted mean
• University of Colombo, Faculty of Science — course weighting (continuous assessment + final split)

The single formula behind this tool — the weighted mean — was last cross-checked against the NIST definition on 2026-07-15. Letter-grade cutoffs are set by each institution and are intentionally left to you as the target percentage; this tool makes no claim about any official band.