All 6 grade calculators tools on GradeCalc, free, instant, no signup.
Grade calculators are not interchangeable, each one answers a different question, and using the wrong one is the most common source of a wrong answer. Match your situation to the row below before entering any numbers.
| Your situation | Calculator | What it answers |
|---|---|---|
| One big exam left, and you know its weight | Final Grade Calculator | What score do I need on the final? |
| A quiz was returned and you have the number wrong | Easy Grader Calculator | What grade is 3 wrong out of 20? |
| You have points earned out of points possible | Test Grade Calculator | What percentage and letter is 17 out of 20? |
| Your syllabus assigns category weights | Weighted Grade Calculator | What is my grade with homework 20%, final 40%? |
| Every score counts equally | Grade Calculator | What is the average of these eight scores? |
Every grade is a proportion in disguise. Points earned divided by points possible gives a percentage; a weighted grade multiplies each percentage by its weight before dividing; a required-score calculation rearranges the same equation to solve for the unknown. There is no hidden mechanism, which is why you can check any result by hand, and why these pages show the formula and worked examples rather than just a number.
All calculations here run in your browser, so nothing you type is sent anywhere. That matters more than it sounds: grade data is personal, and a calculator that needs a server does not need to be trusted with it.
Unless your school says otherwise, the plain 10-point scale applies. Many schools use a finer scale with plus and minus grades; the 4.0 GPA scale page lists every band, and the GPA calculators convert percentages into grade points.
| Letter | Percentage | Grade points | Usually means |
|---|---|---|---|
| A | 90–100% | 4.0 | Excellent, strong command of the material |
| B | 80–89% | 3.0 | Good, solid understanding, minor gaps |
| C | 70–79% | 2.0 | Satisfactory, meets the basic standard |
| D | 60–69% | 1.0 | Passing but weak, usually not enough for a prerequisite |
| F | below 60% | 0.0 | Failing, no credit earned |
Almost every school publishes a rounding rule, and it decides whether an 89.4% becomes a B+ or an A−. The two policies you will meet:
| Policy | What happens to 89.4% | What happens to 89.5% |
|---|---|---|
| Round half up (most common) | 89% → B | 90% → A |
| Truncate / always round down | 89% → B | 89% → B |
| Round to nearest whole, no half-up | 89% → B | 90% → A only if the school treats .5 as up |
If your score lands on a boundary, check your syllabus before assuming anything, a single point at 89.4% versus 89.5% is the most common grade dispute in middle and high school.
A student scores 17 out of 20 on a quiz (85%, B), 24 out of 25 on a second (96%, A) and 42 out of 50 on a midterm (84%, B). Three quizzes and exams so far, all of them 100 points in the gradebook because this course uses percentages with equal weight.
| Assessment | Score | Percentage | Letter |
|---|---|---|---|
| Quiz 1 | 17/20 | 85.0% | B |
| Quiz 2 | 24/25 | 96.0% | A |
| Midterm | 42/50 | 84.0% | B |
| Average | — | 88.3% | B |
Two points of precision matter here. First, the average of the three percentages (88.3%) is not the same as the pooled points (83 out of 95 = 87.4%) unless every assessment carries the same weight, the two methods disagree because the quiz lengths differ. Second, that 88.3% is one point away from nothing in particular on the plain scale, but on a plus/minus scale it is a B+ and one good quiz short of an A−. Which method your course uses is stated in the syllabus, and it decides which number is correct.
If your course weights categories instead of averaging them, the weighted grade calculator applies that structure. If a final exam is still ahead, the final grade calculator turns all of this into a single target score.