How to Calculate GPA: 4.0 Scale, Weighted & Final Grades [2026]

Answer first: GPA = total grade points ÷ total credits. Convert each grade (A=4.0, B=3.0, C=2.0, D=1.0, F=0), multiply by that course's credits, sum everything, and divide by total credits. A student with two A's and one B in 3-credit courses has (12+12+9) ÷ 9 = 3.67. Skip the arithmetic with the free GPA calculator.

The unweighted 4.0 scale

Grade	Points	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	1.0
B−	2.7	F	0.0

This is the scale most colleges recalculate to when comparing applicants from different high schools.

Worked example: unweighted GPA

Fall semester, all 3-credit courses: A in English (12 pts), A− in Math (11.1), B+ in History (9.9), B in Chemistry (9.0). Total = 42.0 points ÷ 12 credits = 3.50. One B+ instead of an A− would drop it to 3.46 — small moves compound fast, which is why tracking per-semester matters.

Weighted GPA: AP, IB, and honors

Typical bumps: +1.0 for AP/IB (A=5.0) and +0.5 for honors (A=4.5). The same report card above, if Math were AP and History honors, becomes (12 + 12.1 + 10.4 + 9.0) ÷ 12 = 3.63 weighted vs 3.50 unweighted. That gap is the reward for rigor — and the reason colleges ask for both numbers plus your course list.

What final-exam score do you need?

Formula: needed = (target − current × (1 − weight)) ÷ weight. Example: 89% in class, final worth 20%, you want 90%: (90 − 89 × 0.8) ÷ 0.2 = (90 − 71.2) ÷ 0.2 = 94%. If the final is worth 30%: (90 − 62.3) ÷ 0.3 = 92.3%. Heavier finals give comebacks more leverage. The calculator's final-grade solver runs this for every course at once.

Cumulative GPA across semesters

Never average semester GPAs directly — weight by credits: (GPA₁ × credits₁ + GPA₂ × credits₂) ÷ total credits. A 3.2 over 15 credits followed by a 3.8 over 12 credits is (48 + 45.6) ÷ 27 = 3.47, not 3.50. Early stumbles dilute as credits accumulate, which is exactly how upward trends show up in admissions.

Common GPA mistakes

Mixing scales: reporting weighted as unweighted (or vice versa) misleads everyone reading the application.
Averaging semester GPAs: always weight by credits, as shown above.
Ignoring +/- policies: a school that counts A− as 3.7 vs 4.0 shifts borderline GPAs by tenths.
Forgetting retakes: some schools replace the grade, others average both attempts — check before assuming a retake erases an F.

Conclusion

Track it per semester, weight by credits, and know your final-exam targets before exam week. Run your numbers in the free GPA calculator — weighted, unweighted, and final-grade solver included.

Frequently Asked Questions

How do I calculate my GPA?

Convert each final grade to grade points (A=4.0, B=3.0, C=2.0, D=1.0, F=0), multiply by the course credits, add everything up, and divide by total credits. The free GPA calculator does this instantly.

What is the difference between weighted and unweighted GPA?

Unweighted caps at 4.0 regardless of course difficulty. Weighted adds ~1.0 point for AP/IB and ~0.5 for honors, so strong AP students can exceed 4.0 — a 4.3 weighted with a 3.7 unweighted is common.

How are plus and minus grades counted?

Most schools use A=4.0, A−=3.7, B+=3.3, B=3.0, B−=2.7, C+=2.3, C=2.0, and so on. Confirm your school's scale — some districts ignore plus/minus entirely.

What grade do I need on the final to keep an A?

Use the formula: needed = (target − current×(1−weight)) ÷ weight. Example: 89% current, final worth 20%, target 90% → (90 − 89×0.8) ÷ 0.2 = 94% needed on the final.

Does GPA round up?

Usually no — most transcripts truncate or show two decimals, so a 3.595 displays as 3.59 or 3.60 depending on school policy. Never assume rounding; check the handbook.

What GPA do colleges want?

Highly selective schools typically admit around 3.8–4.0+ unweighted; state flagships often sit near 3.5–3.8; many solid programs admit 3.0–3.5 with strong trends. Course rigor matters as much as the number.