Grade calculator.
Work out your overall course grade. Enter each score and its weight and the calculator returns your weighted percentage and the letter grade it earns.
Scores and weights
LiveEnter each score as a percentage and its weight in the same order. If you leave weights blank, the calculator uses a simple average instead.
Overall grade
86.1%
weighted by each part
Uses a common US letter scale (90 A, 80 B, 70 C, 60 D). Your school may differ. Calculations run in your browser; nothing you enter is stored.
How it works
Weighting the parts
Most courses build a final grade from parts that count for different shares: homework, quizzes, a midterm, a final. Your overall grade is the weighted average, where each score is multiplied by its weight, the results are added, and the total is divided by the sum of the weights.
So a 78 on a part worth 50% pulls your grade more than a 78 on a part worth 10%. The calculator handles any number of parts and also shows the plain average for comparison.
Reference
Percentage to letter grade.
The common US letter grade for each percentage band.
| Percentage | Letter |
|---|---|
| 90 to 100 | A |
| 80 to 89 | B |
| 70 to 79 | C |
| 60 to 69 | D |
| Below 60 | F |
The full guide
The complete guide to course grades.
How weighting works, what each letter means, and how to find what you need.
How weighted grades work
A weighted grade reflects that not all assessments count equally. You multiply each score by its weight, add those products, and divide by the total weight. If the weights add to 100, the divisor is simply 100.
This is the same maths a gradebook uses, so the result matches what your instructor calculates.
Reading the letter grade
Most US courses map percentages to letters in ten-point bands: 90 and up is an A, 80 to 89 a B, 70 to 79 a C, 60 to 69 a D, and below 60 an F. Some schools add plus and minus steps within each band.
The calculator shows the letter for your weighted percentage using the standard bands.
Weighted versus simple average
A simple average treats every score equally, which only matches your real grade if every part has the same weight. When weights differ, the weighted figure is the accurate one, and the two can diverge noticeably.
The calculator shows both so you can see the effect of weighting.
Working out what you need
To find the score you need on a remaining part, set your target overall grade and solve for the missing score using the same weighting. Entering your known scores here shows where you stand before the final.
Keeping weights accurate is the key to a trustworthy projection.
The formula
Weighted
average.
Your overall grade is the sum of each score times its weight, divided by the total weight.
GPA calculator ›# Weighted course grade
overall = sum(score × weight) / sum(weight)
# 85,92,78,88 at 20,30,25,25
8610 / 100 = 86.1% (B)Questions
Grade questions.
How do I calculate my final grade?
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Multiply each score by its weight, add the results, and divide by the total weight. Enter your scores and weights above and the calculator returns the weighted percentage and letter.
What if my weights do not add to 100?
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That is fine. The calculator divides by the actual sum of the weights, so any consistent set of weights works.
What letter grade is my percentage?
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On the common scale, 90 and up is an A, 80 to 89 a B, 70 to 79 a C, 60 to 69 a D, and below 60 an F. The calculator shows the letter for your result.
What is the difference from a simple average?
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A simple average treats all scores equally. A weighted grade counts each by its share, which is how courses actually grade, so it can differ from the plain average.
Is this grade calculator free?
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Yes. It is completely free with no sign-up, and every calculation runs locally in your browser, so nothing you enter is stored or sent anywhere.
About the developer
Jean Borg
Jean builds and maintains every calculator on freecalculators.pro from Malta, with a focus on tools that are fast, free and show their working. The grade calculator computes a weighted course percentage and the letter it earns.