What this calculator does
This grade calculator works out an overall percentage from any number of individual scores, each carrying its own weight, and maps that percentage onto a standard letter grade. It is built for the common case of a course grade made up of several assignments, tests and a final exam, each worth a different share of the total, rather than a single test result.
Enter the scores as a comma-separated list, then the weight of each one in the same order. The weights do not need to add up to exactly 100: the calculator normalises against whatever total you enter, so 20, 20, 20, 40 and 1, 1, 1, 2 produce the same overall grade, as long as the relative sizes match.
The formula
Each score is multiplied by its weight, those products are summed, and the total is divided by the sum of the weights, giving a weighted average percentage. That percentage is then mapped onto a standard 10-point letter-grade scale (A+ at 97% down to F below 60%). The unweighted average is also shown, so you can see how much the weighting is actually changing the result.
| Term | Meaning |
|---|---|
| Overall grade | The weighted average percentage: Σ(score × weight) ÷ Σweight. |
| Weight | How much each score counts toward the total, in any consistent unit (percent, points, or a simple ratio). |
| Letter grade | The overall percentage mapped onto a standard A+ to F scale. |
The inputs explained
| Field | What to enter |
|---|---|
| Scores for each assignment/category (%, comma separated) | One score per assignment or category, as a percentage, separated by commas. |
| Weight of each, same order (comma separated, any units) | The weight of each score, in the same order as the scores above. Any consistent unit works; they do not need to sum to 100. |
When to use it
Working out a course grade
Assignments, quizzes, a midterm and a final exam each carry a different weight toward the final mark. Listing every score and its weight gives the running overall grade at any point in the term.
Checking a syllabus weighting scheme
Before a course starts, plugging in the stated weights with a range of plausible scores shows how much a single heavily weighted assessment, like a final exam, can move the overall outcome.
Deciding where to focus study time
Comparing the weighted overall grade against the unweighted average shows whether a low score in a lightly weighted category is actually worth losing sleep over, or whether a heavily weighted item deserves the attention instead.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How does the overall grade change as scores rise, at a fixed weighting?
The same four-category weighting (20, 20, 20, 40), run across scores from a weak set to a strong one.
| Scores entered | Overall grade | Letter grade |
|---|---|---|
| 60,60,60,60 | 60.0% | D- |
| 70,72,74,76 | 73.6% | C |
| 80,82,84,86 | 83.6% | B |
| 88,92,76,95 | 89.2% | B+ |
| 90,92,94,96 | 93.6% | A |
| 95,97,98,100 | 98.0% | A+ |
How does weighting alone change the outcome for the same scores?
The same four scores, run against a range of different weighting schemes, from equal weighting to a final-exam-only scheme.
| Weights used | Overall grade | Letter grade |
|---|---|---|
| 25,25,25,25 | 87.8% | B+ |
| 20,20,20,40 | 89.2% | B+ |
| 10,10,10,70 | 92.1% | A- |
| 40,30,20,10 | 87.5% | B+ |
| 0,0,0,100 | 95.0% | A |
| 50,50,0,0 | 90.0% | A- |
Questions
How do I calculate my grade if the weights are given as points rather than percentages?
Enter the points as the weights directly; there is no need to convert them to percentages first. The calculator sums whatever weights you enter and divides by that total, so 15 points out of 100 total behaves the same as 15% out of 100%.
What is my grade if I only know some of the scores so far?
Enter just the scores and weights you have, using only the weight for the assessments already completed. That gives the overall grade for what has been marked so far, not a prediction of the final result including work still to come.
How do I calculate grade for a single test rather than a whole course?
For one test scored as correct answers out of a total, the dedicated test grade calculator is a more direct fit, since it works from raw correct/total counts rather than a pre-computed percentage.
Why does the letter grade use a 10-point scale?
A 10-point scale, where each full letter spans roughly 10 percentage points and a +/- adjusts within it, is the most common grading convention and is used here as a general-purpose default. Individual institutions sometimes use their own cutoffs, in which case the overall percentage shown is the figure to compare against that scheme.
For a single test scored as correct answers out of a total, see the test grade calculator. To work out what score you still need on a remaining assessment to hit a target overall mark, use the grade needed calculator.