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Grade Calculator

To turn a score into a percentage, divide the marks by the marks available: 61/80 is 76.25%. Add each assessment with its weight to get an overall percentage and letter grade, and use the final exam planner to see the score you need for a target. Weights do not have to add up to 100.

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How to use the Grade Calculator

  1. 1Add each assessment with the marks you scored, the marks available, and its weight in the course.
  2. 2The overall percentage and letter grade update as you type.
  3. 3Use the final exam planner to find the score you need for a target grade.
  4. 4Switch grading scales if your institution uses different boundaries.

How it works

Each assessment is converted to its own percentage, multiplied by its weight, and the weighted results are added together. If the weights you enter do not add up to 100%, the tool normalises them — so entering four assessments weighted 1 each treats them as equal quarters.

The final exam planner rearranges that sum. It takes the weight you have already banked, the target overall percentage, and solves for the score needed on the remaining assessment. When the required score is above 100% it says so plainly, rather than showing an impossible number without comment.

Letter grades come from the boundary table for the scale you select. Boundaries vary between institutions, so treat the letter as indicative and the percentage as the reliable figure.

The formula

overall % = Σ ((score ÷ maximum) × weight) ÷ Σ weight × 100
score
marks you achieved on an assessment
maximum
marks available for that assessment
weight
how much that assessment counts toward the course

Weights are normalised, so they do not have to add up to exactly 100.

Worked example

A course with coursework, a midterm and a final

  1. Coursework: 42/50, weight 20 → 84% × 0.20
  2. Midterm: 61/80, weight 30 → 76.25% × 0.30
  3. Final: 70/100, weight 50 → 70% × 0.50

Result: 16.8 + 22.9 + 35.0 = 74.7% overall, which is a C on a standard scale.

Common scores as percentages

Each score divided by the marks available, with the letter grade on the standard 90/80/70/60 scale.

ScorePercentageLetter grade
7/1070%C
8/1080%B
15/2075%C
17/2085%B
18/2572%C
21/2584%B
30/4075%C
34/4085%B
35/5070%C
42/5084%B
45/5090%A
56/8070%C
61/8076.25%C
64/8080%B
72/8090%A
65/10065%D

Tips and common mistakes

  • Enter every assessment with the weight your syllabus gives it; weights that do not add up to 100 are scaled for you.
  • Use the final exam planner early, while there is still time to change how you prepare.
  • Treat the percentage as the reliable figure. Letter boundaries differ between institutions.
  • Check whether your course uses weights or total points before trusting either figure; they give slightly different answers.

Frequently asked questions

How do I turn a score like 61/80 into a percentage?
Divide the marks you scored by the marks available and multiply by 100. 61 ÷ 80 = 0.7625, so 61/80 is 76.25% — a C on both the standard 90/80/70/60 scale and the plus/minus scale. Enter any score as a single assessment and the tool does the same for you.
What do I need on the final to pass?
Enter your completed assessments, set the target percentage, and the planner solves for the final score required. It tells you clearly if the target cannot be reached.
Do my weights have to add up to 100?
No. They are normalised, so weights of 1, 1, 2 are treated as 25%, 25% and 50%.
Why is my letter grade different from my school's?
Grade boundaries are set by each institution and differ widely. Pick the closest scale, or read the percentage and apply your own boundaries.
What percentage is a C?
On the common US scale, 70–79%. With plus and minus grades, C− starts at 70%, C at 73% and C+ at 77%. Your institution's table may differ.
Can I include assessments I have not taken yet?
Leave them out of the list and use the final exam planner, which works out the score you need on the remaining assessment.
My course adds up total points instead of using weights. Can I still use it?
Yes. Give each assessment a weight equal to its maximum marks. A 50-mark test weighted 50 and a 100-mark exam weighted 100 reproduce a total-points calculation exactly.
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