Weighted Grade Calculator
Average scores that carry different weights.
Results update as you type.
How it works
A weighted grade calculator combines several scores into one average that respects how much each assessment matters. Not every grade in a course counts equally: a final project worth half the grade should move your average far more than a warm-up quiz worth a twentieth of it. Enter each score alongside the weight it carries, and the tool multiplies score by weight, adds those products together, and divides by the total of the weights to produce a single, honest percentage. This is the same weighted-average method that grade books, report cards and grading software use everywhere. Because the calculator divides by the total weight you enter, your weights do not need to add up to 100 — points, category percentages or simple ratios all work, since the division rescales them automatically. Any row you leave blank, or give a weight of zero, is simply ignored, so you can use two components or three without breaking the maths. Students reach for a weighted grade calculator to check exactly where they stand partway through a term, to see how a strong or weak result in one category shifts the whole, and to plan which assessment deserves the most effort. Teachers and parents use it to verify a mark quickly, and anyone tracking progress toward a target grade can update the numbers as new scores arrive and watch the average respond in real time.
weighted average = Σ(score × weight) ÷ Σ(weight)
Each score is multiplied by its weight so that a heavier assessment contributes proportionally more to the final number. Summing those weighted products gives the total value earned across every component. Dividing by the sum of the weights normalises that total back onto a 0-to-100 percentage scale, which is exactly why the weights need not total 100 — any consistent scale produces the same answer because the division cancels out the scale. Components with zero or blank weight drop out because they add nothing to either sum.
Source:Standard weighted-average grading
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter score 1 and weight 1.
- 2
Adjust the options
Adjust score 2, weight 2, score 3 and weight 3 if they apply — sensible defaults are already set.
- 3
Read your result
Weighted average updates instantly as you type — no button to press.
Frequently asked questions
Do my weights have to add up to 100?
No. The calculator divides by the total of whatever weights you enter, so any consistent scale gives the correct result. Weights of 1, 1 and 2 produce the same average as 25, 25 and 50, because both describe identical relative importance. This is convenient when your syllabus lists weights as points or category fractions rather than tidy percentages. Enter the numbers exactly as your course states them and let the division do the normalising.
What if I only have two components to average?
That is fine — fill in the first two score-and-weight pairs and leave the third row blank. Any row without a weight is skipped entirely, so the average is computed only from the components you actually entered. The same applies if you want a quick two-item weighted blend, such as a midterm and a final. The tool never assumes a missing row is a zero score, which would otherwise drag your average down unfairly.
How is a weighted average different from a simple average?
A simple average treats every score as equally important, adding them and dividing by the count. A weighted average multiplies each score by how much it counts before averaging, so a component worth half the grade influences the result ten times more than one worth a twentieth. Courses almost always weight their assessments, which is why a plain average of your scores usually differs from — and misrepresents — your true standing in the class.
Can I mix categories like homework and exams?
Yes, as long as you first reduce each category to a single score. Average all your homework into one homework percentage, all your quizzes into one quiz percentage, and so on, then enter each category score with the weight your syllabus assigns to that category. Entering individual assignments with category-level weights would double count them. Collapsing each category to one number first keeps the weighting accurate and matches how your grade book totals the course.
Why did my average not change when I edited a zero-weight row?
A row with a weight of zero contributes nothing to either the weighted total or the sum of weights, so its score has no effect on the result — that is by design. Zero weight is the calculator's way of switching a component off. If you want a score to count, give it a positive weight reflecting its share of the grade. If you genuinely want equal weighting, assign every component the same non-zero weight.