🎓 GPA Calculator
Calculate high school or college Grade Point Average (GPA) on a 4.0 weighted scale.
How GPA is calculated, and why credit hours change everything
Grade point average is a weighted mean. Each grade is converted to points on a scale, multiplied by the credit hours of the course, and the total is divided by the total credits. The weighting is the part people skip, and it is the reason an A in a one-credit seminar does far less for your average than a B in a four-credit lab.
GPA = Σ(grade points × credit hours) / Σ(credit hours)
The standard 4.0 scale
| Letter | Points | Letter | 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 |
Not every institution uses plus and minus modifiers, and some cap A+ at 4.0 while others award 4.3. Check your own institution's table before comparing your number to anyone else's.
A worked semester
| Course | Credits | Grade | Points | Credits × points |
|---|---|---|---|---|
| Biology | 4 | B+ | 3.3 | 13.2 |
| Calculus | 4 | A− | 3.7 | 14.8 |
| History | 3 | B | 3.0 | 9.0 |
| Spanish | 3 | A | 4.0 | 12.0 |
| Seminar | 1 | C | 2.0 | 2.0 |
| Total | 15 | — | — | 51.0 |
GPA = 51.0 / 15 = 3.40. Notice how little the one-credit C costs: dropping it from the calculation would lift the average only to 3.50. The four-credit courses carry nearly four times the weight each.
Cumulative GPA
To combine semesters, do not average the GPAs. Multiply each semester's GPA by its credits to recover the quality points, add everything, and divide by total credits. A 3.80 over 12 credits and a 3.20 over 18 credits give (45.6 + 57.6) / 30 = 3.44, not 3.50. Averaging the two GPAs directly ignores that the second semester carried more weight.
This is the same weighting error that appears whenever percentages from different-sized groups are averaged. The larger the imbalance in credits, the further the naive average drifts.
Weighted high school GPA
Many US high schools add a bonus for harder courses, typically 1.0 for AP and IB classes and 0.5 for honours. An A in an AP course scores 5.0 rather than 4.0, which is how a weighted GPA can exceed 4.0. Universities often recalculate applicants' GPAs on their own unweighted scale to compare candidates from schools with different weighting policies, so both numbers are worth knowing.
Moving a cumulative GPA
The more credits you have, the harder the average is to shift. With 90 credits at 3.10, a perfect 4.0 semester of 15 credits lifts you to 3.23. The same perfect semester at 30 total credits lifts a 3.10 to 3.40. This is why early semesters matter disproportionately, and why recovering from a poor first year takes longer than most students expect.
| Existing credits | New cumulative GPA |
|---|---|
| 15 | 3.55 |
| 30 | 3.40 |
| 60 | 3.28 |
| 90 | 3.23 |
| 120 | 3.20 |
A worked example
A student has 68 credits at 3.26, giving 221.68 quality points. They take 16 credits and earn 3.75, adding 60 points. Cumulative becomes 281.68 / 84 = 3.35. To reach 3.50 by graduation at 120 credits, they need (420 − 281.68) / 36 = 3.84 across the remaining 36 credits.
Frequently Asked Questions (FAQs)
Is a 3.5 GPA good?
On an unweighted 4.0 scale, 3.5 is generally considered strong and sits comfortably above the typical threshold for honours and most graduate programmes. Context matters: a 3.5 in a demanding programme can be viewed more favourably than a 3.8 in a lighter one.
How do I calculate GPA across multiple semesters?
Convert each semester back to quality points by multiplying its GPA by its credits, sum the points and the credits separately, then divide. Averaging the semester GPAs directly gives the wrong answer unless every semester carried identical credits.
What is the difference between weighted and unweighted GPA?
Unweighted caps every course at 4.0 regardless of difficulty. Weighted adds a bonus, usually 0.5 or 1.0, for honours, AP or IB courses, so it can exceed 4.0. Universities frequently recalculate to an unweighted scale for comparability.
Do failed courses count?
Yes, an F counts as 0.0 quality points while still contributing its credit hours to the denominator, which is why a single failure is so damaging. Many institutions allow a retake to replace the original grade; policies differ on whether the first attempt stays on the transcript.
How is GPA calculated outside the US?
Most countries use entirely different systems: UK degree classifications, European ECTS grades, Indian percentages and CGPA out of 10. Conversions between them are approximate at best, and institutions usually publish their own conversion table for admissions.
Do pass/fail courses affect GPA?
Normally not. A pass earns the credit without contributing quality points, so it is excluded from the calculation entirely. A fail may count as 0.0 at some institutions, which makes pass/fail less risk-free than it appears.