a clear step-by-step guide
How to Calculate GPA
What GPA actually is, how the 4.0 scale works, the formula behind it, and two worked examples — one high school, one college. If you just want the number, use our GPA calculator — it does this math for you.
1. What is GPA?
GPA stands for Grade Point Average. It's a single number, usually between 0.0 and 4.0, that summarizes your academic performance across multiple courses. Each letter grade gets converted to a point value (A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0), each course is weighted by its credit hours, and the average is your GPA.
Schools, colleges, and employers use GPA as a fast signal of academic standing. Scholarship cutoffs, honor roll thresholds, graduate-school admissions, and even some job applications hinge on it. That's why the number matters more than the math behind it would suggest.
Four flavors of GPA you'll run into:
- Semester GPA — the average for one term only. Useful for tracking progress and qualifying for honor roll. Semester GPA Calculator →
- Cumulative GPA — the running average across every semester you've completed. This is what shows on transcripts and what most scholarships and grad schools care about. Cumulative GPA Calculator →
- Unweighted GPA — uses the 4.0 scale only. Every course counts the same way regardless of difficulty. An A in PE = an A in AP Calculus.
- Weighted GPA — adds bonus points for advanced classes (Honors +0.5, AP/IB +1.0), pushing the maximum to 5.0. Most US high schools report both. Weighted GPA Calculator →
Once you know which GPA someone's asking for, the math is the same — the rest of this page walks through it.
2. The GPA Formula
Your GPA is the credit-weighted average of your letter grades, converted to point values. Mathematically:
GPA = (C1 × G1) + (C2 × G2) + … + (Cn × Gn)C1 + C2 + … + Cn
C = credit hours assigned to a course · G = grade points (see scale below)
Three operations: multiplication, addition, division. That's the entire calculation. The trick is using the right values — the next section gives you the standard mapping from letter grades to grade points.
3. GPA Scale — Letter Grades to Points
The standard US 4.0 scale, used by most American high schools, colleges, and universities. Some schools award A+ as 4.0 (most common) or as 4.33 (less common); we use 4.0 to match what most transcripts report.
This page covers the 4.0 scale. Other countries use different scales — UK first-class honors, India's 10-point CGPA, Germany's inverted 1.0–5.0 — and even within the US, a handful of universities use 4.33 or 5.0 caps for specific programs. If your transcript uses a non-4.0 scale, convert first with our Grade-to-GPA Converter.
| Letter | Percentage | Grade points |
|---|---|---|
| A+ | 97-100% | 4.0 |
| A | 93-96% | 4.0 |
| A- | 90-92% | 3.7 |
| B+ | 87-89% | 3.3 |
| B | 83-86% | 3.0 |
| B- | 80-82% | 2.7 |
| C+ | 77-79% | 2.3 |
| C | 73-76% | 2.0 |
| C- | 70-72% | 1.7 |
| D+ | 67-69% | 1.3 |
| D | 63-66% | 1.0 |
| D- | 60-62% | 0.7 |
| F | below 60% | 0.0 |
Schools differ slightly on the exact percentage cutoffs (e.g. some treat 93% as A-, others as A). Always check your school's grading policy if you need precision. For weighted GPAs (5.0 scale used in some high schools), see our Weighted GPA Calculator.
4. Step-by-Step Instructions
- 1
List every course with its grade and credit hours.
One semester only? You're calculating a semester GPA. Every semester ever? That's a cumulative GPA.
- 2
Convert each letter grade to its point value using the scale above.
A=4.0, B=3.0, C=2.0, etc. Write the point value next to each course.
- 3
Multiply each grade point by its credit hours.
This gives you that course's weighted grade points.
- 4
Sum all the weighted grade points.
Add up the products from step 3.
- 5
Sum all the credit hours.
Total your divisor.
- 6
Divide step 4 by step 5.
The result is your GPA. Round to two decimal places.
5. Example 1 — High School (6 Classes)
Maya is a junior. She took six full-year classes — English 11 (A), Algebra II (B), US History (A-), Biology (A), Spanish III (B+), and Art (A). Her school assigns 1 credit per full-year class.
| Course | Grade | Credits | Points |
|---|---|---|---|
| English 11 | A | 1 | 1 × 4.0 = 4.0 |
| Algebra II | B | 1 | 1 × 3.0 = 3.0 |
| US History | A- | 1 | 1 × 3.7 = 3.7 |
| Biology | A | 1 | 1 × 4.0 = 4.0 |
| Spanish III | B+ | 1 | 1 × 3.3 = 3.3 |
| Art | A | 1 | 1 × 4.0 = 4.0 |
| Total | — | 6 | 22.0 |
| GPA = 22.0 ÷ 6 | 3.67 | ||
Maya's GPA is 3.67 — strong A-/B+ territory, comfortably honor-roll range at most high schools. Because every class is 1 credit, the math is just the average of her grade points. If Algebra II had been an Honors or AP class, the weighted GPA would be higher.
6. Example 2 — College (5 Classes, Mixed Credits)
A more typical college semester. Jordan took five classes with varying credit weights — STEM labs run 4 credits, electives run 1.
| Course | Grade | Credits | Points |
|---|---|---|---|
| Organic Chemistry | C+ | 4 | 4 × 2.3 = 9.2 |
| Calculus II | B- | 4 | 4 × 2.7 = 10.8 |
| Philosophy 101 | A | 3 | 3 × 4.0 = 12.0 |
| Spanish Literature | A- | 3 | 3 × 3.7 = 11.1 |
| PE Elective | A | 1 | 1 × 4.0 = 4.0 |
| Total | — | 15 | 47.1 |
| GPA = 47.1 ÷ 15 | 3.14 | ||
Jordan's semester GPA is 3.14 — a low B. Notice how the A in PE (1 credit) barely moves the GPA, while the C+ in Organic Chem (4 credits) drags it down. The big-credit STEM classes dominate the average, which is why STEM majors often quote lower GPAs than humanities majors at the same school.
7. Common Mistakes
- Averaging semester GPAs to get cumulative. The classic. If Fall is 3.20 over 15 credits and Spring is 3.60 over 12 credits, the cumulative GPA is not (3.20 + 3.60) ÷ 2 = 3.40. It's (3.20 × 15 + 3.60 × 12) ÷ (15 + 12) = 91.2 ÷ 27 = 3.38. Always re-weight by credits — see our Cumulative GPA Calculator.
- Forgetting that A+ usually = 4.0. Most US schools cap A+ at 4.0. A few (very few) award 4.33 for A+ — check your school's scale.
- Including pass/fail (P/NP) and W/WF courses. Pass/Fail grades don't affect GPA — exclude them from both the numerator and the denominator. Withdrawal (W) is the same. Withdrawal-Failing (WF) usually does count as an F at most schools — check your registrar.
- Mixing weighted and unweighted scales. High school AP/IB classes use a 5.0 scale for weighted GPA. Don't mix 4.0-scale grades with 5.0-scale grades in the same calculation — use the Weighted GPA Calculator for that.
- Forgetting that high school is 1 credit per class. College habits don't transfer. If you're calculating a high school GPA, enter 1 credit per full-year class, not 3 or 4.
- Using letter grades from a different country's scale. UK, Canada, India, and others use different scales (9.0, 4.33, etc.). Convert to the 4.0 scale first with our Grade-to-GPA Converter.
8. Weighted vs. Unweighted GPA
Two different numbers, same student. Unweighted GPA caps everything at 4.0 — an A is an A, whether you earned it in PE or AP Physics. Weighted GPA adds bonus points for harder courses: Honors typically +0.5, AP/IB +1.0, so the ceiling moves up to 5.0.
Concrete: an A in AP Calculus is 4.0 unweighted, 5.0 weighted. An A in a regular elective is 4.0 either way. A student loading their schedule with AP classes gets a weighted-GPA bump that an unweighted GPA wouldn't reward.
Colleges look at both. They want strong raw grades and strong course rigor — which is why most admissions offices recalculate GPAs in-house using their own conventions. For a step-by-step weighted calculation, use our Weighted GPA Calculator.
FAQ
01What is the GPA formula?
GPA = Σ (grade_points × credit_hours) ÷ Σ (credit_hours). Multiply each course's grade points by its credits, sum across all courses, then divide by the total credits. The result is a number between 0 and 4 on the standard scale.
02Why do credit hours matter in GPA calculation?
Credit hours weight each course by its time commitment. A 4-credit chemistry course should count more toward your GPA than a 1-credit PE course. Without credit weighting, every course would be treated equally — which is not how transcripts work.
03My high school lists 1 credit per class — does that work?
Yes. Most US high schools assign 1 credit to every full-year class, so the weighting collapses and your GPA becomes a simple average of grade points. Six classes × 1 credit each works exactly the same as the formula — multiply, sum, divide. If your school uses fractional credits (0.5 for a one-semester class), enter those as-is and the math still holds.
04Is GPA calculated the same in high school and college?
Yes — the formula is identical. The difference is in credit values: high school courses are typically 1 credit each, while college courses are 3-4 credits. So a single bad grade in college affects GPA more than the same grade in high school. Weighted high-school GPAs add bonuses for AP/Honors; unweighted does not.
Sources & Further Reading
Everything on this page maps to how the U.S. Department of Education, College Board, and the professional registrars' association actually define grading. Drill in if you want the primary documents.
- How is Grade Point Average Calculated? — NCES (U.S. Department of Education)
The federal government's official methodology for standardizing high-school GPAs on the 4.0 scale, from the NAEP High School Transcript Study.
- SAT Scores by High School GPA — NCES Digest of Education Statistics
Federal data table mapping high-school GPA bands (A+ through below D) to mean SAT scores — useful for seeing where your GPA sits in the national distribution.
- AP Score Scale Table — College Board
The authoritative table mapping AP exam scores (1–5) to college course-grade equivalents — what an AP score actually means before any high school adds weighting on top.
- Academic grading in the United States — Wikipedia
Canonical encyclopedia overview of U.S. letter grades, 4.0-scale conversions, and weighted-GPA conventions — broad orientation before drilling into the primary sources above.