Weighted Grade Calculator
Calculate your overall weighted grade from individual scores and their weights.
Frequently asked questions
How is a weighted grade calculated?
Each score is multiplied by its weight, those are added together, then divided by the total weight — so a 90% worth 40% of your grade counts more than a 90% worth only 10%.
What if my weights don't add up to 100%?
The calculator still works and shows a proportional result, but flags it so you can double-check — your actual course weights should generally add up to 100% for the result to represent your true final grade.
Can I add more than three grades?
Yes — click "+ Add another grade" to add as many score/weight pairs as you need.
Does this calculate what I need on a final exam?
Not automatically, but you can work it out in a few seconds with the formula in the "What grade do I need on my final exam?" section below. Enter the marks you already have, then use the formula with your target grade.
What's the difference between a weighted and unweighted grade calculator?
An unweighted calculator treats every score equally (a simple average). A weighted grade calculator — like this one — lets each score count for a different share of the final grade, matching how most course syllabi actually assign categories like homework, tests, and exams different percentages.
How do I calculate grades with weighted percentages by hand?
Multiply each score by its weight (as a decimal), add those results together, then divide by the total weight. For example, a 90% worth 30% and an 85% worth 70% gives (90×0.30 + 85×0.70) ÷ 1.00 = 86.5%. This calculator does that arithmetic for you automatically.
Can I use this for a college or university module?
Yes, as long as you know how each part of the module is weighted. Most module handbooks and syllabi list this clearly.
How do I enter extra credit?
Add the extra credit points to the score of the category they belong to (for example, 92 plus 3 becomes 95 for homework) instead of adding a separate row. The calculator divides by the total weight, so an extra row with its own weight would pull your average toward that score instead of adding to it. Some courses cap grades at 100%, so check your syllabus.
Why is my result different from my school portal?
Schools sometimes round at each step, drop low scores or use a different scale. Check your syllabus for rounding rules and for how each category is weighted.
About this tool
This calculator finds your overall weighted grade from individual assignment, test, or category scores and their respective weights — the same method most course syllabi use to calculate final grades.
Worked example
Say your course is graded 20% homework, 30% midterm and 50% final exam, and so far you have 90 on homework, 78 on the midterm and 84 on the final. Multiply each score by its weight: 90 × 0.20 = 18, 78 × 0.30 = 23.4 and 84 × 0.50 = 42. Add them up and you get 83.4%.
Notice that the final exam moved the result most, even though it was not your highest score, because it carries half the weight. That is the main thing to check with any weighted grade: look at the weights before you decide where to spend your study time. If your syllabus drops the lowest score or uses categories, enter each category as one row with its combined weight.
What grade do I need on my final exam?
To find the score you need on the last piece of work, use this formula:
Needed score = (Target grade − Current average × (1 − Final weight)) ÷ Final weight
"Current average" is your average on the work already marked, and "final weight" is the share of the course the final is worth, written as a decimal (50% = 0.5).
Example. Using the course above (20% homework, 30% midterm, 50% final), you scored 90 on homework and 78 on the midterm. Those marks are worth 18 + 23.4 = 41.4 points out of the 50 available so far, an average of 82.8% on completed work. Here is what the final needs to be for each target:
| Target final grade | Score needed on the final |
|---|---|
| 70% | 57.2% |
| 80% | 77.2% |
| 85% | 87.2% |
| 90% | 97.2% |
Check for the 85% target: 41.4 + (87.2 × 0.50) = 41.4 + 43.6 = 85.0. If the number you need is above 100%, that target is not reachable with the marks you have, and it is worth asking your tutor whether extra credit or a resit applies.
How this calculator shows your letter grade
Next to your percentage the calculator shows a letter grade on a US-style plus/minus scale. Schools vary, so always check the scale in your own syllabus.
| Percentage | Letter | Percentage | Letter |
|---|---|---|---|
| 93 and above | A | 73 to 76.9 | C |
| 90 to 92.9 | A- | 70 to 72.9 | C- |
| 87 to 89.9 | B+ | 67 to 69.9 | D+ |
| 83 to 86.9 | B | 63 to 66.9 | D |
| 80 to 82.9 | B- | 60 to 62.9 | D- |
| 77 to 79.9 | C+ | Below 60 | F |
In Ireland and the UK, university degrees are usually classed differently: a First is typically 70% and above, an upper second (2:1) 60 to 69%, a lower second (2:2) 50 to 59%, and a Third or pass 40 to 49%. Use the percentage this calculator gives you and compare it with your own institution's bands.
Tips for entering your grades correctly
- Use one row per category when a course has many items. If homework is 20% across ten assignments, enter your average homework score as one row with a 20% weight instead of ten separate rows.
- Handle "drop the lowest score" rules first. Remove the lowest mark from the category, then average the rest.
- Use percentages, not raw points. If you got 17 out of 20, enter 85.
- Leave out work that has not been marked. Enter only what you have, then use the final exam formula above to see what you still need.
- Check that the weights total 100%. If they do not, the calculator flags it and shows a result based on the weights you entered, which may not match your real grade.
Weighted grade vs GPA
A weighted grade is your percentage in a single course. A GPA converts results from several courses into grade points and averages them. Use this calculator for one course, and the GPA calculator for the overall picture.