The short version
Convert each letter grade to grade points (A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0), multiply by that course's credit hours to get quality points, then divide total quality points by total credit hours. GPA = Σ (grade points × credits) ÷ Σ credits. The result lives on the 4.0 scale.
Step 1: turn letters into grade points
The standard scale most US schools use:
| Grade | Grade points | Grade | Grade points |
|---|---|---|---|
| A+ / A | 4.0 | C | 2.0 |
| A− | 3.7 | C− | 1.7 |
| B+ | 3.3 | D+ | 1.3 |
| B | 3.0 | D | 1.0 |
| B− | 2.7 | D− | 0.7 |
| C+ | 2.3 | F | 0.0 |
Two caveats: some schools count A+ as 4.3, and some don't use plus/minus at all (straight A/B/C/D). Always check your school's published scale before reporting the number anywhere that matters — a scholarship cutoff won't care that "most schools" do it differently.
Step 2: multiply by credit hours
This is the step most people skip — and the whole point of the system. A grade's influence is proportional to its course's credits. An A in a 4-credit lab earns 16.0 quality points; an A in a 2-credit elective earns 8.0. Same letter, half the weight.
Intuition: your GPA answers "how did I do per credit hour?" — not "how did I do per course?" A rough semester of heavy-credit courses drags the number more than a rough semester of light ones, and acing your heaviest courses is the fastest way to lift it.
Step 3: divide quality points by credits
GPA = total quality points ÷ total credit hours. That's the entire formula. Everything else — weighting, scales, cumulative math — is a variation on this division.
Worked example: a 3.37 semester
Maya's semester: English A (3 cr → 4.0 × 3 = 12.0), Biology B+ (3 cr → 3.3 × 3 = 9.9), Calculus A− (4 cr → 3.7 × 4 = 14.8), History B (3 cr → 3.0 × 3 = 9.0), Chemistry C+ (3 cr → 2.3 × 3 = 6.9), Art A (2 cr → 4.0 × 2 = 8.0). Quality points total 60.6 over 18 credit hours: 60.6 ÷ 18 = 3.37. Notice the 4-credit A− (14.8) outweighs the 2-credit A (8.0) — credits are the hidden lever. Run your own semester in the GPA calculator — it does the grade-point math instantly and shows where you sit against the 3.5 Dean's List line.
Weighted vs unweighted GPA
Unweighted GPA uses the plain scale above and caps at 4.0 — every course is treated equally, hard or easy. Weighted GPA adds a bonus for harder courses, commonly +0.5 for honors and +1.0 for AP/IB, before multiplying by credits. A weighted GPA can legitimately exceed 4.0 — a student with straight A's in AP courses might show 4.6.
Which one matters? Colleges usually re-weight on their own scale anyway, and high schools report whichever version they publish. Report the version the application asks for, and if it asks for "unweighted," compute it with zero bonuses — that's what unweighted means.
Semester GPA vs cumulative GPA
A semester GPA covers one term; a cumulative GPA runs the same formula over all courses ever taken — total lifetime quality points ÷ total lifetime credits. That math has a consequence students feel in junior year: the more credits you've already banked, the harder each new semester moves the needle. Raising a 2.8 to a 3.0 with 60 credits behind you takes far more A's than with 15.
Three honest ways to raise it
1. Retake the worst high-credit grade. If your school replaces retaken grades (many do for D/F), re-taking a 4-credit course where you earned a D erases 4.0 quality points of damage and can add up to 16.0 — a 12-point swing in one course. No other move compares.
2. Load the courses you can ace. Because credits weight the math, five credits of A in subjects you're strong in move the number more than heroic effort in a subject that fights you. Play offense with your schedule.
3. Know the final-exam math before finals week. Most courses publish grade weights — run the final grade calculator for each course so you know exactly what each exam needs to be, then spend your hours where the points per hour are highest.
Frequently asked questions
Does GPA round up?
Schools differ — some truncate, some round to two decimals, some to one. A 3.495 is not a 3.5 unless your school's policy says so. If you're sitting on a cutoff, ask the registrar how they round rather than assuming.
Do pass/fail courses affect GPA?
Usually no — pass/fail courses typically don't enter the quality-point math at all (neither the numerator nor the denominator). That's why students use them strategically for risky electives. Confirm your school's rule; a few count a "fail" as an F.
What GPA do I need for grad school or scholarships?
Most graduate programs list 3.0 as a minimum, competitive ones want 3.5+, and merit scholarships commonly sit between 3.0 and 3.75. These are floors, not guarantees — the rest of the application still has to carry weight.
Can GPA go above 4.0?
Weighted GPA can — honors and AP bonuses push it to 4.5 or 5.0 at many high schools. Unweighted GPA cannot exceed 4.0 by definition. If someone quotes a 4.6, it's weighted.