The calculation
How to calculate weighted grades
Quick answer: multiply each category score by its weight written as a decimal, then add the results. If the weights cover the whole course, that sum is your grade.
Write each weight as a decimal. A category worth 30% uses a weight of 0.30.
A worked example
Say your syllabus splits the course into homework 15%, quizzes 15%, midterm 30%, and final exam 40%, and your scores are 92, 84, 76, and 88:
- 01
Convert each weight to a decimal: 15% becomes 0.15, 30% becomes 0.30
- 02
Multiply each score by its weight: 92 × 0.15 = 13.8, then 12.6, 22.8, and 35.2
- 03
Add the results: 13.8 + 12.6 + 22.8 + 35.2 = 84.4
- 04
Read the answer against the letter scale: 84.4 is a solid B
Notice what the weighting did: the 76 on the midterm hurt three times as much as the 84 on quizzes helped, because the midterm carries three times the weight. That is exactly the information a plain average hides, and it is why a grade calculator with weights matches your teacher's gradebook when a straight average doesn't.
Letter grade scale used by this calculator
For the most accurate result, enter the percentages shown in your gradebook. Letter inputs are estimates: a letter score uses the midpoint of its range, so a B counts as 84.5, and a letter target in the planner uses the bottom of its range, so A- means reaching at least 90. Schools vary, so percentages always win when you have them.
| Letter | Percentage |
|---|---|
| A+ | 97-100% |
| A | 93-96% |
| A- | 90-92% |
| B+ | 87-89% |
| B | 83-86% |
| B- | 80-82% |
| C+ | 77-79% |
| C | 73-76% |
| C- | 70-72% |
| D+ | 67-69% |
| D | 63-66% |
| D- | 60-62% |
| F | Below 60% |
Mid-semester math
What if your weights don't add up to 100?
If the categories you enter total less than 100, the calculator assumes those are the only ones with grades so far and normalizes across them. Say only homework, quizzes, and the midterm are graded: those weights cover 60% of the course, so your current grade is the weighted points you've earned divided by the weight actually graded: (13.8 + 12.6 + 22.8) ÷ 0.60 = 82. Your syllabus categories still total 100 from day one; the point is that an ungraded final never drags your current grade down as a zero.
If your weights add up to more than 100, the usual explanations are extra credit or a mistyped number. Double-check the syllabus before trusting the result.
Full semester
84.4%All four categories graded, weights totalling 100.
Mid-semester, normalized
82%Only 60% of the course graded, so the sum is divided by 0.60.
Mode 02
Weighted grade calculator with points
Some classes skip percentage weights entirely: every assignment is worth points and your grade is points earned over points possible. The points tab is a points grade calculator for exactly this. List each assignment with its earned and possible points, and the running total does the rest, no hand conversion required. If your class mixes both systems, points inside weighted categories, enter each category's percentage in the first tab instead.
Example You have 412 points across assignments worth 480 points in total.
Your grade is 85.8%, a solid B.Same word, different math
Weighted grades vs a weighted GPA
The word weighted does double duty in school, which causes real confusion. A weighted class grade is about one course: homework counts 15%, the final counts 40%. A weighted GPA is about your whole transcript: an A in AP Chemistry earns more grade points than an A in a regular class. This weighted average grade calculator handles the first job. GPA math needs credit hours and course types, and that is a separate tool we're building next.
Check before trusting any number
Common weighted grading mistakes
- 01
Averaging your category averages. Adding four category percentages and dividing by four ignores the weights entirely. It is the single most common reason your math disagrees with the gradebook.
- 02
Leaving a dropped quiz in the math. If your teacher drops the lowest quiz, remove it before averaging the category, or your calculated grade will sit below your real one.
- 03
Rounding too early. Round the final answer, not each category. Small roundings stack into a visible error.
- 04
Counting extra credit as its own category. Extra credit usually adds points inside an existing category rather than carrying its own weight.
- 05
Treating a class grade calculator like a GPA tool. One class and one transcript are different calculations, per the section above.
Transparent by default
Methodology and citation
What the tool assumes
Category scores combine linearly by their stated weights. When entered weights total less than 100, the grade is normalized by the graded weight. Letter scores use range midpoints; letter targets use range bottoms. Required minimums in the planner are rounded upward.
What it does not assume
It does not predict curves, dropped grades, unequal weighting inside a category, or policy changes. The result is a planning calculation, not a guarantee from your school.
Maintained by: DoMyHomework.co
Last reviewed: August 5, 2026
Cite this tool: DoMyHomework.co. “Weighted Grade Calculator.” Updated August 5, 2026. https://domyhomework.co/tools/weighted-grade-calculator/
Straight answers
Weighted grade calculator FAQ
01 How do I calculate my weighted grade by hand?
Multiply each category score by its weight as a decimal and add the results. With scores of 92, 84, 76, and 88 at weights of 15/15/30/40, that is 13.8 + 12.6 + 22.8 + 35.2 = 84.4.
02 Why can’t I just average my scores?
A plain average treats a 5% quiz and a 40% final as equals. Your teacher’s gradebook doesn’t, so your average and your real grade drift apart, sometimes by a full letter.
03 My weights don’t add up to 100. Is my grade wrong?
No. The calculator assumes you entered only the categories that have grades so far and divides by that graded weight, so your current grade reflects finished work only. Your syllabus categories can still total 100 from day one.
04 My teacher drops the lowest quiz. What do I enter?
Leave that quiz out. Average the remaining quizzes and enter that number as your quiz category score.
05 How does extra credit work in a weighted class?
Usually it adds points inside an existing category, pushing that category’s score up, sometimes past 100. Enter the boosted category score and the math stays correct.
06 How do I calculate weighted grades in Excel?
Use SUMPRODUCT: put scores in one column, decimal weights in another, and enter =SUMPRODUCT(A:A, B:B)/SUM(B:B). Or skip the spreadsheet, the first tab above is the same formula with fewer ways to break it.
07 What’s the difference between a weighted grade and a weighted GPA?
A weighted grade scores one class using category weights. A weighted GPA scores your transcript, giving harder courses extra grade points. This tool does the first; a GPA calculator does the second.