Grade Calculator

About the Grade Calculator

Most courses do not grade by a simple average. Instead, each type of work — homework, quizzes, labs, projects, a midterm and a final exam — counts for a set share of the final grade, listed in the syllabus. A final exam worth half the course matters far more than a quiz worth a tenth, so knowing your true standing means working out a weighted average.

This grade calculator does exactly that. List each assessment with its weight as a percentage of the course and your score, either as a percentage or as points such as 42/50. The calculator multiplies each score by its weight, adds them up and divides by the total weight. If you have not finished the course, it gives your grade so far, based only on the work already marked, and tells you how much of the course is still to come. It also gives the letter grade on the common US bands.

How to Use the Grade Calculator

Enter one assessment per line: a name, the weight in percent, then the score. For example, Midterm 30 78, or Quiz 10 42/50.

Leave out assessments you have not done yet to see your grade so far.

The weights must not add up to more than 100%.

The Formula

  weighted points = Σ (weight × score ÷ 100)
  grade           = weighted points ÷ total weight × 100

  a score written as points:   42/50 = 42 ÷ 50 × 100 = 84%

Step-by-Step Examples

A finished course.

  Homework   20% × 92  = 18.4
  Midterm    30% × 78  = 23.4
  Final      50% × 85  = 42.5
  total                  84.3 of 100  →  84.30%, a B

Halfway through. With only the homework and midterm marked:

  18.4 + 23.4 = 41.8 of 50 weighted points
  41.8 ÷ 50 × 100 = 83.60% so far, with 50% of the course to come

Points and percentages together. A 10% quiz at 42/50 (84%) and a 20% test at 85% give 8.4 + 17 = 25.4 of 30 points, or 84.67% so far.

Weighted Versus Simple Averages

If you averaged the three scores in the first example without weights, you would get (92 + 78 + 85) ÷ 3 = 85%. The weighted grade is 84.3% because the midterm, your weakest score, counts for more than the homework, your strongest. The difference can be larger when weights are more uneven. A student who aces homework worth 10% but struggles in exams worth 90% may feel their average is high while their real grade is much lower. Weighting reflects what the instructor decided each type of work is worth, so it is the figure that will appear on your report.

Categories and Points-Based Courses

Syllabi often group work into categories: homework 20%, quizzes 15%, exams 65%. Within a category, scores are averaged first, sometimes after dropping the lowest one, and then the category average is weighted. To use this calculator, enter each category as one line with its average score. Some courses do not use weights at all but add up points: every assignment is worth a number of points and your grade is total points earned divided by total points possible. For those, enter each assignment with a weight equal to its share of the total points, or simply enter the totals as one line, such as Course 100 412/480.

Letter Grades and Rounding

The calculator uses the common US bands: 93% or more is an A, 90% an A-, 87% a B+, 83% a B, and so on down to 65% for a D, with anything lower an F. Your school or instructor may use different cut-offs, such as a straight 90–80–70–60 scale, and may round, so an 89.5% might become an A-. Always check the grading scale in your syllabus, and remember that gradebook software sometimes shows unweighted figures until all categories have marks.

Planning the Rest of the Course

Knowing your grade so far is most useful when you plan ahead. If half the course is still to come, every remaining point matters twice as much as it would at the end. Once you know your current grade and the weight of the final exam, the final grade calculator shows exactly what you need on it to reach an A, B or C. Keeping a running list of scores and weights through the term also lets you spot a slipping category early, while there is still time to improve.

Tracking Grades Through the Term

A simple habit makes grade calculations painless: every time work is returned, note its score and the category it belongs to. At any point you can then enter the categories into the calculator and see where you stand, instead of waiting for the end of term. If a teacher posts grades online, compare your own figure with theirs; a large difference may reveal a missing assignment or a score entered incorrectly, which is far easier to fix early than after the course has ended.

Understanding Your Result

The headline is your weighted course grade with its letter.

The weighted points line shows the points earned and whether the course is complete.

The by assessment line shows each score, weight and contribution.

The worth knowing line explains the letter bands used.

When Should You Use This Calculator?

Use it to check the grade shown in your school's gradebook.

Use it partway through a term to see where you stand.

Use it to see how one assessment affects your overall grade.

Common Mistakes

Averaging scores without weights. Heavily weighted exams change the result.

Entering weights that add up to more than 100%. Check the syllabus categories.

Counting unmarked work as zero. Leave it out to see your grade so far.

Assuming everyone uses the same letter cut-offs. Check your syllabus scale.