Grade Average Calculator
A grade average calculator reduces a list of percentage grades to a single number. Simple mode adds the grades and divides by how many there are, treating each equally. Weighted mode multiplies each grade by a weight, sums those products, and divides by the total weight, so a heavily weighted exam moves the average more than a quiz. Weights are relative and need not total 100. Students and teachers use it to track performance across several assessments at once.
Switch between simple average and weighted average. Add a row for each grade, optionally set a weight, and we return the average percent plus a letter grade estimate.
Quick Answer
Average a list of percentage grades. Simple mode takes the plain mean; weighted mode lets each grade carry its own weight. The result is the average percent and its letter grade on the calculator's default scale.
Simple average adds every grade and divides by the number of grades.
Letter grade · B
86.60%
5 grades averaged
Examples
Simple: 92, 88, 85, 90, 78
= 86.60% (B)
Weighted: 90 weight 2, 80 weight 1
= 86.67% (B)
Quizzes light, exams heavy
Weighted average reflects exam weight
How it works
Formula · Simple = Σ(grade) ÷ n · Weighted = Σ(grade × weight) ÷ Σ(weight)
Simple average adds all grades and divides by the count. Weighted average multiplies each grade by its weight, sums those, and divides by the total weight. Both reduce a list of grades to one number.
Simple · Σ(grade) ÷ n
Weighted · Σ(grade × weight) ÷ Σ(weight)
Grading scale used here
| Percent | Letter | Grade points |
|---|---|---|
| 97-100% | A+ | 4.0 |
| 93-96% | A | 4.0 |
| 90-92% | A− | 3.7 |
| 87-89% | B+ | 3.3 |
| 83-86% | B | 3.0 |
| 80-82% | B− | 2.7 |
| 77-79% | C+ | 2.3 |
| 73-76% | C | 2.0 |
| 70-72% | C− | 1.7 |
| 67-69% | D+ | 1.3 |
| 63-66% | D | 1.0 |
| 60-62% | D− | 0.7 |
| Below 60% | F | 0.0 |
This is the default scale this calculator uses, not a national standard. Schools set their own cutoffs: some use a 10-point scale where 90 to 100 is an A and 80 to 89 is a B, some award no plus or minus grades at all, and some give more than 4.0 for an A+. Check your syllabus or your school's official chart for the cutoffs that count.
Related GPA and grade calculators
- Test grade calculator for turning a single score out of a total into a percent and letter.
- Semester grade calculator for combining grading periods and a semester exam.
- Weighted grade calculator for percent grades combined by syllabus weights.
- Final grade calculator for the final course grade given a current grade and final exam.
- College GPA calculator for converting semester grades into a credit-weighted GPA.
- High school GPA calculator for weighted and unweighted GPA across regular, honors, AP, or IB courses.
Related Calculators
More tools from Education
Frequently asked questions
For a simple average, add up the grades and divide by the number of grades. For a weighted average, multiply each grade by its weight, sum those products, and divide by the sum of weights. The simple average treats every grade equally; the weighted average lets bigger weights count for more.
Simple average treats every grade as equally important. Weighted average lets you say one grade counts more than another. If your syllabus says the midterm is worth more than a quiz, weighted average gives the correct overall grade; if you just want the mean of five test scores, simple average is enough.
No. The calculator normalizes whatever weights you enter. You can use 1, 2, 3 for relative importance, or use percent weights like 20, 30, 50. The math gives the same answer as long as the proportions are the same.
This calculator's default scale is 97-100% = A+, 93-96% = A, 90-92% = A-, 87-89% = B+, 83-86% = B, 80-82% = B-, 77-79% = C+, 73-76% = C, 70-72% = C-, 67-69% = D+, 63-66% = D, 60-62% = D-, below 60% = F. It is a default, not a national standard — some schools use a 10-point scale where 90 to 100 is an A, and some award no plus or minus grades at all. Check your school's official chart.
Yes. Enter grades above 100 to include extra credit. In simple mode the extra credit lifts the mean directly. In weighted mode it lifts the weighted result in proportion to the weight of that row.
Related calculators
Education
Grade Calculator
Calculate your current class grade by entering your assignment scores. Supports both simple averages and weighted grading systems.
Education
Test Grade Calculator
Turn one test score into a percentage and a letter grade. Enter questions correct, questions missed, or points earned out of the total.
Education
Weighted Grade Calculator
Combine assignments, quizzes, and exams by weight to get a precise weighted course average.