Grade Calculator & GPA Calculator
Grading math shouldn\'t eat your evening. This free grade calculator builds a complete wrong-answer grading chart for any test length — with custom grade cutoffs, plus/minus grades, and one-click printing for teachers. The second tab is a full GPA calculator on the standard 4.0 scale with credit hours. Everything runs 100% in your browser — no sign-up, nothing uploaded.
| Wrong | Right | Score | Grade |
|---|
Add each course with its letter grade and credit hours. GPA is calculated on the standard 4.0 scale.
100% client-side — nothing is uploaded or stored.
The grading formula
Every percentage grade comes from one formula:
Score % = (points earned ÷ points possible) × 100
Miss 3 out of 20 questions and you earned 17: 17 ÷ 20 × 100 = 85%. The chart above runs that calculation for every possible wrong-answer count at once, so a teacher grading a stack of identical tests just looks up each paper\'s wrong count instead of doing long division thirty times.
How letter grade scales work
Letters are just labeled percentage bands. The default 90/80/70/60 scale — A from 90 up, B from 80, C from 70, D from 60, F below — is the most common in the US, but it\'s a convention, not a law: some teachers use 93/85/77, some schools mandate their own. With plus/minus grading, each band splits three ways — roughly the top 3 points take a plus, the middle 4 stay plain, the bottom 3 take a minus — giving twelve steps (A+ through D−, plus F) instead of five.
Set the cutoffs above to match your actual syllabus before trusting any letter the chart shows.
What GPA is — and the 4.0 scale
GPA (grade point average) compresses a whole report card into one number by converting each letter grade to points, weighting by credit hours, and averaging:
GPA = Σ (grade points × credits) ÷ Σ credits
| Letter | Grade points | Letter | Grade points |
|---|---|---|---|
| A+ / A | 4.0 | C+ | 2.3 |
| A− | 3.7 | C | 2.0 |
| B+ | 3.3 | C− | 1.7 |
| B | 3.0 | D+ | 1.3 |
| B− | 2.7 | D | 1.0 |
| D− | 0.7 | ||
| F | 0.0 |
This is the standard unweighted 4.0 scale — an A is 4.0 points regardless of course difficulty, so the maximum GPA is 4.0. Some schools use weighted scales that add bonus points (often +1.0) for honors or AP classes, letting GPAs climb past 4.0; if yours does, add the bonus to each grade\'s points before averaging. Credit hours matter because a 4-credit A moves your GPA twice as much as a 2-credit A.
Tips for students and teachers
- Students: use the GPA tab each semester to see exactly how much each course moves your average — it makes "should I retake this class?" a math question instead of a guessing game.
- Teachers: print the grading chart for your most common test lengths and keep it with your answer keys; grading a class set becomes a lookup, not a calculation.
- Borderline grades: if your syllabus rounds (89.5 → 90), toggle decimals on to see the unrounded score before deciding.
Frequently asked questions
- How is a percentage grade calculated?
- Divide points earned by points possible, then multiply by 100. Got 17 out of 20 right? 17 ÷ 20 × 100 = 85%. The grading chart on this page does that math for every possible number of wrong answers at once.
- What is the standard A/B/C/D grading scale?
- The most common US scale is A: 90–100%, B: 80–89%, C: 70–79%, D: 60–69%, F: below 60%. But scales vary by school, teacher, and country — which is why this calculator lets you set custom cutoffs. Always check your syllabus before assuming the standard scale.
- How do plus and minus grades work?
- Each 10-point band splits into three: the top ~3 points earn a plus, the middle ~4 stay plain, and the bottom ~3 earn a minus. So with a 90/80/70/60 scale: A+ is 97–100, A is 93–96, A− is 90–92, B+ is 87–89, and so on. F never takes a minus.
- What is GPA and how is it calculated?
- GPA (grade point average) converts letter grades to numbers on a 4.0 scale — A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0 — multiplies each by the course's credit hours, and divides the total grade points by total credits. A 3-credit A counts three times as much as a 1-credit A.
- What's the difference between weighted and unweighted GPA?
- Unweighted GPA caps at 4.0 — an A is 4.0 whether the class was regular or AP. Weighted GPA gives bonus points (often +1.0) for honors, AP, or IB classes, so GPAs can exceed 4.0. This calculator computes unweighted GPA on the standard 4.0 scale; for weighted GPA, add your school's bonus to the grade points first.
- Can I print the grading chart?
- Yes — the Print button outputs a clean, printer-friendly version of just the chart (no menus or buttons). Teachers use these charts to grade stacks of tests fast: find the wrong-answer count, read across to the percentage and letter.
- Is my grade data uploaded anywhere?
- No. All calculations happen in your browser with JavaScript — your scores, courses, and GPA never leave your device.