Education
GPA calculator
Add your courses, their grades and how many credits each carries. Credit hours are the part people forget, and they change the answer more than any single grade does.
Weighted adds 0.5 for honours and 1.0 for AP or IB courses, the most common US high-school convention.
| Course | Grade | Credits | Level |
|---|
Credit hours are the whole point
A GPA is not the average of your grades. It is the average of your grades weighted by how much each course counts, and that distinction produces results people find surprising.
An A in a one-credit gym class and a C in a four-credit chemistry course do not average to a B. The chemistry course carries four times the weight, so the real GPA is 2.4, not 3.0.
This is why students protecting a GPA guard their high-credit courses hardest, and why a single bad grade in a five-credit lab sequence does more damage than two bad grades in one-credit electives.
Weighted, unweighted, and why colleges recalculate anyway
Weighted GPAs add a bonus for harder courses, typically 0.5 for honours and 1.0 for AP or IB, which is how a student ends up with a 4.3. Unweighted caps at 4.0 and treats every course the same.
| Course | Grade | Unweighted | Weighted |
|---|---|---|---|
| AP Calculus | B | 3.0 | 4.0 |
| Honours English | A− | 3.7 | 4.2 |
| Regular History | A | 4.0 | 4.0 |
The important caveat: there is no national standard for weighting, so a 4.2 from one school is not comparable to a 4.2 from another. Many selective universities therefore recalculate every applicant’s GPA themselves, usually unweighted, usually counting only academic core subjects, and often ignoring freshman year. Your school’s number is a starting point, not the one they will use.
Why a cumulative GPA gets harder to move
Each new term is averaged into everything that came before, in proportion to credits. After 15 credits, one strong term can swing your cumulative average by half a point. After 90 credits, the same term barely moves it a tenth.
The practical consequence is that early grades matter disproportionately, not because anyone weights them more, but because they sit in the denominator for longer. Recovering a low first year is arithmetically possible but takes sustained work rather than one good semester.
What GPA does not capture
Grade point averages compress a great deal into one number and lose a lot doing it. Two identical 3.5 averages can hide completely different trajectories: one steady, one starting at 2.8 and climbing to 4.0. Admissions readers and employers who look carefully notice the trend, which usually says more than the average. Course rigour, unusual subject combinations and an upward slope are all invisible in the single figure.
Common questions
How do I calculate my GPA by hand?
Multiply each course’s grade points by its credit hours, add those products, then divide by the total credit hours. For an A (4.0) in a 3-credit course and a C (2.0) in a 4-credit course: (4×3) + (2×4) = 20, divided by 7 credits, gives 2.86.
Is a weighted GPA above 4.0 better?
Only within your own school, where the same weighting applies to everyone. Across schools it is not comparable, since weighting policies differ enormously. Most selective colleges recalculate a standardised unweighted GPA from your transcript, so the honest way to read a weighted number is as evidence you took harder courses, not as a higher grade.
Does a pass/fail course affect GPA?
Usually not. A passing grade normally earns the credit without contributing grade points, so it drops out of both the numerator and the denominator. A failing grade often does count as zero points, which means pass/fail protects your average on the upside but not always on the downside. Check your institution’s specific policy.
How much can one bad grade hurt?
It depends almost entirely on how many credits you have already banked. A C in a 3-credit course when you have 12 credits total drops a 4.0 to about 3.6. The same C at 90 credits moves a 4.0 to about 3.94. Enter your previous cumulative GPA and credits above to see the exact effect in your case.