Weighted Grade Calculator

What is a weighted grade calculator?

A weighted grade calculator turns several category scores into one overall course grade, giving each category the importance your syllabus assigns it. You add a row for each category — homework, quizzes, a midterm, a final — type its percentage grade and its weight, and the tool returns your overall grade as a percentage.

Most courses do not treat every assignment equally. A final exam might count for half your grade while homework counts for a fifth. A plain average ignores that, but a weighted average respects it. This tool does the weighting for you and runs entirely in your browser, so nothing you type is uploaded or stored.

How a weighted grade is calculated

The calculator uses the standard weighted-average formula:

weighted grade = Σ(grade × weight) ÷ Σ(weight)

Here is what each term means:

• Grade — the percentage score for one category, from 0 to 100 (or higher with extra credit).
• Weight — how much that category counts. It can be a percentage, a points value, or any consistent number.
• Σ — the sum across every category you entered.

In words: multiply each category’s grade by its weight, add all those products together, then divide by the total of the weights. Because the tool divides by the sum of the weights, your weights do not have to add up to 100. Weights of 20, 30 and 50 behave exactly the same as 2, 3 and 5 — they are normalised by their own total. The result is a percentage on the same scale as your input grades.

Weighted vs. unweighted average

Method	What it does	When to use
Unweighted average	Adds the grades and divides by how many there are	Every category counts the same
Weighted average	Multiplies each grade by its weight before averaging	Some categories count more than others

If your syllabus lists percentages next to each category — “Final: 50%, Midterm: 30%, Homework: 20%” — you need the weighted average, which is what this tool computes.

Examples

Each example below reproduces the calculator’s output exactly. Each product is grade times weight.

Example 1 — a standard syllabus. Homework 90% (weight 20), Midterm 82% (weight 30), Final 88% (weight 50).

• Products: (90×20) + (82×30) + (88×50) = 1,800 + 2,460 + 4,400 = 8,660
• Total weight: 20 + 30 + 50 = 100
• Weighted grade = 8,660 ÷ 100 = 86.6%

Example 2 — weights that do not total 100. Quizzes 75% (weight 1), Project 90% (weight 2), Final 80% (weight 2).

• Products: (75×1) + (90×2) + (80×2) = 75 + 180 + 160 = 415
• Total weight: 1 + 2 + 2 = 5
• Weighted grade = 415 ÷ 5 = 83%

Here the weights are small whole numbers, yet the formula still works because it divides by their sum of 5. The same project counting twice as much as quizzes is all the calculator needs.

Example 3 — a heavily final-weighted course. Participation 95% (weight 10), Midterm 70% (weight 30), Final 85% (weight 60).

• Products: (95×10) + (70×30) + (85×60) = 950 + 2,100 + 5,100 = 8,150
• Total weight: 10 + 30 + 60 = 100
• Weighted grade = 8,150 ÷ 100 = 81.5%

Notice the strong final (85%) pulls the grade above the weak midterm (70%) because the final carries six times the weight.

Common uses

• End-of-term grade — combine homework, quizzes, exams and projects into your final course percentage.
• What-if planning — try a score for an upcoming exam to see how it would move your overall grade.
• Checking the gradebook — confirm the number your instructor’s system reports matches the syllabus weights.
• Setting goals — work out what you need on the final to reach a target letter grade.
• Any weighted average — score a rubric, judge a contest, or rate products where some criteria matter more than others.

Tips and common mistakes

• Match the weights to your syllabus. The grade is only right if the weights reflect how each category actually counts.
• Keep grades and weights in separate columns. A common error is typing a weight into the grade field; the grade is the score earned, the weight is how much it counts.
• You can use raw weights. If your syllabus gives points instead of percentages (say 200 points for the final, 100 for the midterm), enter those points as the weights — no conversion needed.
• A zero weight means it is ignored. A category weighted 0 adds nothing and leaves your grade unchanged, which is handy for parking a category you have not graded yet.
• Round only at the end. The tool keeps full precision while summing and rounds the final figure, so rounding each category by hand first can introduce small errors.

Limitations and notes

This calculator returns a percentage, not a letter grade or GPA. Letter-grade cut-offs (for example 90 and above being an A) vary by school, so check your own grading scale to translate the percentage. The tool assumes every category you want counted is entered with its correct weight; categories you leave out are simply not part of the average, which can make your grade look higher or lower than the official one.

It also does not model dropped scores, capped extra credit, or curved grades — those policies differ by instructor and would need to be applied before or after using this tool. Treat the result as an accurate calculation of the numbers you enter, and confirm your final grade against your instructor’s gradebook before relying on it for an official purpose.

For more grade tools, try the final grade calculator to find the exam score you need, the grade percentage calculator to turn points into a percentage, or the GPA calculator for a credit-weighted 4.0 average. You can also browse the full education category.