Final Grade Needed Calculator
This tool answers a very common question before an exam: how much you need to score to reach the minimum passing grade or your target. You only need your current grade, the final exam weight, and your target.
With a 78 current average, a 70 target, and a final exam worth 30%, you need 51.33 on the final: an achievable score even with margin.
Formula
Grade needed = (Target − Current grade × Weight already graded) ÷ Final weight
Step-by-step example
- Current grade = 78, weight already graded = 70% (0.70)
- Target = 70
- Final weight = 30% (0.30)
- Grade needed = (70 − 78 × 0.70) ÷ 0.30 = (70 − 54.6) ÷ 0.30 = 51.33
Scenario table (current 78, final 30%)
| Target | Grade needed on final | Achievable? | |---|---|---| | 60 | 18.00 | Yes, easily | | 70 | 51.33 | Yes, with margin | | 80 | 84.67 | Yes, needs a good exam | | 90 | 118.00 | No (exceeds 100) |
How to interpret the result
- If the grade needed is 0 or less, you already reach the target even with a 0 on the final.
- If it is between 0 and 100, the target is possible: that is your minimum score.
- If it is above 100, the target is not achievable with that exam alone; check for extra credit or rounding.
The logic works for any combination of assessments: enter the accumulated weight of what is already graded (the sum of percentages of grades you already have) and the calculator does the rest.
The calculator assumes a 0-100 scale and weights that add up to 100% between graded work and the final. Check your institution's rules (rounding, minimum grades to sit the exam) before relying on the result.
Frequently asked questions
Use: (target − current grade × weight already graded) ÷ final weight. Example: (70 − 78 × 0.70) ÷ 0.30 = 51.33.
That your target is not achievable with the final exam alone: even a perfect score would not reach the average. Check for extra work, rounding, or improving previous grades.
Yes, as long as you convert your grades to a 0-100 scale and use the real weight of the final exam. The formula is the same on any scale.
It means you already reach your target even with a 0 on the final. You can relax or use the exam to raise your average.
Related calculators
- Weighted average: calculate your current average by weights
- Study hours: plan how much to study for the final
- Pomodoro timer: organize review sessions
- Percentages: convert weights and grades between scales