SwiftShort answer
GPA = total quality points ÷ total graded credits. Convert each letter grade to scale points (A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0 …), multiply by the course's credit hours, sum, then divide by graded credits only. Weighted scales (AP/IB/Honours) are set by your school — there is no national weighting rule.
Scope and assumptions
GPA rules vary by school and sometimes by program. Confirm letter-grade values, weighting, and how withdrawals, repeats and pass/fail courses count in your own syllabus and registrar policy before relying on any figure. This page is informational and is not an official transcript.
Every fall, the same conversation happens in the advising office: a student averages five course percentages, gets 86.58, and announces it as a GPA. It isn't one. GPA is a credit-weighted average of your letter grades — convert each grade to scale points, multiply by the course's credit hours, add everything up, divide by graded credits. A 4-credit course moves the number four times as much as a 1-credit course, and by hand the whole thing takes about five minutes.
Find your scenario
- College-specific rules (retakes, P/F, major GPA)? → College GPA rules explained
- One term only? → Semester GPA guide
- All semesters combined? → CGPA guide
- "What do I need on the final?" → Final grade guide
- Syllabus category weights? → Weighted grade guide
- Target grade, remaining work? → Required grade guide
- Points earned vs possible? → Grade guide
- One assignment's impact? → Assignment grade guide
- Converting percentage grades to a 4.0 scale? → Percentage to GPA guide
What is a GPA calculator?
A GPA calculator converts letter grades into a single credit-weighted average on the 4.0 scale. You enter each course's grade and credit hours; it returns your grade point average. It does not judge the grades — it only does the arithmetic a registrar would do, which is why the same transcript always produces the same number.
How the GPA formula works: quality points divided by credits
Two ingredients. First, your letter grade maps to scale points on the 4.0 scale:
| Letter | Points | Letter | Points |
|---|---|---|---|
| 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 |
| F | 0.0 |
Second, each course carries credit hours. Multiply the two and you get quality points:
Quality points = scale points × credit hours GPA = total quality points ÷ total graded credits
Nothing else enters the formula.
Calculate GPA manually with credit hours
Add each course's quality points, then divide the total by graded credits — a five-minute exercise with a pencil.
Weighted vs unweighted GPA in high school
Many high schools add weight: Honours +0.5, AP/IB +1.0, so an A in an AP course can be worth 5.0. Colleges almost never weight — your transcript scale is set by the registrar and printed in the course catalog. Before averaging anything, check which scale your school uses. Mixing a 5.0-weighted grade into a 4.0 average is one of the most common self-inflicted GPA errors.
Worked example: one real first-semester schedule
A first-year student finishes the fall term with this transcript:
| Course | Credits | Grade | Points | Quality points |
|---|---|---|---|---|
| BIO 101 | 4 | A− | 3.7 | 14.80 |
| ENG 110 | 3 | B | 3.0 | 9.00 |
| MATH 121 | 4 | B+ | 3.3 | 13.20 |
| HIST 150 | 3 | A | 4.0 | 12.00 |
| KIN 100 | 1 | A | 4.0 | 4.00 |
| Total | 15 | 53.00 |
GPA = 53.00 ÷ 15 = 3.53
Notice the asymmetry: the 1-credit KIN course — even with an A — moved the average by a fraction of a point, while the 4-credit BIO and MATH courses dominate. That is by design. GPA measures how much graded coursework you did well in, not how many courses you took.
What is NOT inside the number: does a withdrawn course affect GPA?
- Withdrawn (W) courses: normally excluded from GPA, but too many W's can trip satisfactory-academic-progress rules for financial aid.
- Pass/fail (P/F): a P usually earns zero quality points and zero graded credits.
- Repeated courses: many colleges replace the original grade; others average both attempts. The registrar's policy decides.
- Transfer credits: they typically count toward credits required for graduation but not toward your GPA at the new school.
- Incompletes (I): excluded until resolved, then backdated into the term.
Retake and transfer rules sit outside this arithmetic: use our College GPA Calculator to price a retake, a pass/fail course or a transfer before you quote a number. For the full walkthrough, see whether retaking a class replaces your grade.
Five errors that quietly move the number
- Averaging class percentages instead of grade points.
- Counting W or P courses as graded credits.
- Mixing weighted and unweighted scales in one calculation.
- Forgetting that lab and studio courses carry credit hours too.
- Rounding each course before summing — 3.533 is a 3.53, not a 3.6.
FAQ
Q: Is GPA the average of my class percentages? No. It is an average of grade points weighted by credit hours — a 4-credit course counts four times a 1-credit course.
Q: Do all schools use A = 4.0? Most US colleges do, but scales vary: some add A+ (4.3), high schools may weight to 5.0, and a few institutions stay on a 100-point system.
Q: Does a withdrawn course hurt my GPA? Usually a W is excluded from the calculation, but repeated withdrawals can affect satisfactory academic progress and financial aid.
Q: How much does one B+ move a 3.80? At 60 credits (228.0 points), one 3-credit B+ (9.9 points) gives 237.9 ÷ 63 = 3.78.
Q: Is a 3.5 GPA good? Context decides. Dean's list often starts at 3.5, and many competitive programs screen somewhere around 3.0–3.5.
Q: Do pass/fail courses count? Usually excluded — a P earns no quality points — but pre-health programs often cap how many P/F credits they accept.
Q: Can my GPA drop in a term of all A grades? No. If every graded course is an A, the cumulative average can only stay flat or rise.
Q: Which GPA do employers see? The cumulative GPA printed on your transcript; some applications ask for major GPA separately.
Sources: standard US academic grading references (en.wikipedia.org/wiki/Academic_grading_in_the_United_States); College Board (collegeboard.org); university registrar grading policies.
Disclaimer: GPA rules vary by school and sometimes by program. Confirm letter-grade values, weighting, and how withdrawals, repeats and pass/fail courses count in your own syllabus and registrar policy before relying on any figure. This page is informational and is not an official transcript.