Last updated 3 September 2026
The 4.0 scale used here
A = 4.0, A- = 3.7, B+ = 3.3, B = 3.0, B- = 2.7, C+ = 2.3, C = 2.0, C- = 1.7, D+ = 1.3, D = 1.0, F = 0.0 — the standard scale most US institutions use.
Why credit hours matter
GPA is a weighted average, not a simple one. Each grade is converted to points, multiplied by that course's credit hours, and all of those are added up before dividing by the total credits. A 4-credit course pulls the average harder than a 1-credit one — which is exactly the point, since it represents more of your actual workload.
Weighted and unweighted GPA
An unweighted GPA treats every course equally on a 4.0 scale, so an A is 4.0 whether it came from a standard class or an advanced one. A weighted GPA adds extra points for harder courses — commonly one full point for AP or IB and half a point for honours — which is why weighted figures above 4.0 are possible and why a 4.3 is not an error.
The complication is that weighting schemes are not standardised. Two schools can report very different weighted GPAs for identical transcripts. This is exactly why many universities recalculate applicants' GPAs themselves using their own consistent formula, often counting only academic subjects and ignoring the school's weighting entirely. A calculated figure is a useful planning number, not an official one.
Why credit hours matter
A GPA is a weighted mean, not a simple average of grade points. Each course contributes in proportion to its credit hours, so a four-credit course affects the result twice as much as a two-credit one. Averaging grade points directly — a common mistake — produces a number that can be off by several tenths.
The practical consequence is about where effort pays. Improving a grade in a high-credit course moves the GPA considerably more than the same improvement in a one-credit elective. It also explains why a GPA becomes progressively harder to shift over time: by the third year, each new semester is a small fraction of the total credits already accumulated, so a single strong term moves the cumulative figure much less than it would have in the first year.
Common questions
How is GPA calculated?
Each grade converts to grade points (A = 4.0, B = 3.0, and so on), multiplied by that course's credit hours. Add all of those up, then divide by the total credit hours. A 4-credit A counts for more than a 2-credit A, which is what makes it a weighted average rather than a simple one.
Why does a course need credit hours, not just a grade?
A harder or larger course usually carries more credit hours, and it should count for more in the average. Without weighting by credits, a one-hour seminar and a four-hour core class would pull the GPA equally, which doesn't match how most institutions calculate it.
Does this match my school's exact scale?
It uses the standard US 4.0 scale with +/- increments, which most institutions follow, but some use different point values or don't use plus/minus grades at all. Check your school's official policy if you need an exact figure for a transcript.
What is the difference between weighted and unweighted GPA?
Unweighted treats all courses equally on a 4.0 scale. Weighted adds extra points for advanced courses — often a full point for AP or IB and half for honours — which is why weighted figures can exceed 4.0.
Why does the calculation use credit hours?
Because a GPA is a weighted mean, not a plain average. A four-credit course counts twice as heavily as a two-credit one. Averaging grade points directly ignores this and can produce a figure several tenths away from the real one.
Will a university accept the GPA I calculate here?
Treat it as a planning figure. Many institutions recalculate applicants' GPAs using their own formula, often counting only academic subjects and disregarding the school's weighting, precisely because weighting schemes vary so much between schools.