# Current 70%, final worth 30%, want B (80%) — Final Grade Calculator

> You have 70% with finals worth 30%. Getting a B (80%) requires 103.3% on the final — not achievable. See the highest grade still reachable from here.

- **Answer:** Need 103.3% — not achievable
- **Category:** Education & Grades
- **Interactive calculator:** https://youcalc.com/en/education-grades/final-grade-calculator/need-on-final-70-want-b/
- **Price:** Free, no sign-up required
- **Full calculator:** [Final Grade Calculator](https://youcalc.com/en/education-grades/final-grade-calculator/)
- **Pre-filled inputs:** `c=70&t=80&w=30`

| Metric | Value |
| --- | --- |
| Current grade | 70% |
| Final weight | 30% |
| Target grade | 80% (B) |
| Required final score | 103.3% (impossible) |
| Best possible outcome | 79% |
| Minimum guaranteed | 49% |


## Overview

With 70% going in and a final worth 30%, landing a B (80%) would require a 103.3% on the final — which is impossible with a 100-point scale. Your ceiling is 79% even with a perfect final score. This scenario illustrates why consistent mid-term performance matters: the final alone cannot bridge a 10-point gap when it only accounts for 30% of the grade.

## Method

The required final score is derived from the weighted-average course grade formula: course grade = current × (1 − w) + final × w, where w = finalWeight / 100. Rearranging to isolate the final exam score gives: required = (target − current × (1 − w)) / w. The best-case course grade assumes a perfect 100 on the final; the worst-case assumes 0. Both are computed from the same formula with the final score substituted in. Sources: RogerHub Final Grade Calculator (https://rogerhub.com/final-grade-calculator/) and Calculator.net Grade Calculator (https://www.calculator.net/grade-calculator.html).

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- [GPA Calculator](https://youcalc.com/en/education-grades/gpa-weighted-grade/)
- [Weighted Grade Calculator](https://youcalc.com/en/education-grades/weighted-grade-calculator/)
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## Sources

- https://rogerhub.com/final-grade-calculator/
- https://www.calculator.net/grade-calculator.html

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Interactive version: https://youcalc.com/en/education-grades/final-grade-calculator/need-on-final-70-want-b/ · From YouCalc — https://youcalc.com