# Current 90%, final worth 30%, want A (93%) — Final Grade Calculator

> With 90% and a final worth 30%, you need 100% on the final to secure an A (93%). See if a perfect score is achievable and what your floor is.

- **Answer:** Need 100% on the final
- **Category:** Education & Grades
- **Interactive calculator:** https://youcalc.com/en/education-grades/final-grade-calculator/need-on-final-90-want-a/
- **Price:** Free, no sign-up required
- **Full calculator:** [Final Grade Calculator](https://youcalc.com/en/education-grades/final-grade-calculator/)
- **Pre-filled inputs:** `c=90&t=93&w=30`

| Metric | Value |
| --- | --- |
| Current grade | 90% |
| Final weight | 30% |
| Target grade | 93% (A) |
| Required final score | 100% |
| Best possible outcome | 93% |
| Minimum guaranteed | 63% |


## Overview

At 90% with a final worth 30%, the only path to an A (93%) is a perfect 100% on the final: (93 − 90 × 0.70) ÷ 0.30 = (93 − 63) ÷ 0.30 = 100. It is technically achievable, but leaves no room for error. If you score 99, your course grade lands at 92.7%, narrowly missing the A threshold. Your guaranteed floor even with a zero on the final is 63%.

## 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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## 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-90-want-a/ · From YouCalc — https://youcalc.com