Like UC, the California State University system recalculates your GPA from scratch — it isn't your report-card GPA. The rules are close to UC's, with two CSU twists: college courses count twice, and 10th-grade honors are capped more tightly. And San Luis Obispo (SLO), though a CSU, calculates it a third way. Here's exactly how each is calculated — and how the CSU GPA Calculator does it for you, showing your CSU and SLO numbers side by side.
Which courses and years count
CSU uses A-G courses taken in 10th and 11th grade only — the same window as UC. Ninth-grade and twelfth-grade courses don't count toward the CSU GPA. (SLO is the exception — more on that below.)
Only A-G coursework counts — the college-preparatory classes across the seven subject areas. Non A-G electives are excluded.
How grades become points
Each letter grade earns the base points shown here, before any honors bonus. Like UC, CSU uses whole letters only.
Plus and minus grades don't change the CSU GPA: an A+, A, and A− all count as 4 points.
The three CSU GPAs
The calculator shows all three live as you add courses. Capped Weighted is the number CSU campuses use.
Honors weighting and caps
Eligible honors courses — AP, IB, transferable college courses, and certified honors — earn +1 extra point per semester for grades of A, B, or C (a D or F earns no bonus). CSU then caps how much honors can help:
- At most 2 honors points from the 10th-grade period — tighter than UC's 4.
- At most 8 honors points total across 10th and 11th grade.
College courses count twice
This is the rule that sets CSU apart from UC: a UC/CSU-transferable college course counts double. Its grade points, its course count, and its honors bonus are all doubled — so a college A is worth 8 points instead of 4, and an eligible honors college course adds 2 toward the cap instead of 1. (UC counts transferable college courses only once.)
San Luis Obispo (SLO) is different
SLO is a CSU campus, but it calculates GPA its own way: it includes 9th grade. The catch is that 9th-grade courses earn no honors bonus — they count at face value only. Every other rule follows the CSU standard (the same 2-point 10th cap, 8-point total, and college doubling).
The practical effect: if you took strong honors courses in 9th grade, your SLO number is usually a little lower than your CSU number — those 9th-grade courses add to the average but not to the honors bonus.
How the calculator does it for you
Instead of guessing which courses are honors-eligible, the calculator pulls your high school's official UC-approved course list, so honors and transferable-college courses are applied automatically — and it computes your CSU and SLO GPAs together, so you can compare them as you build your course list.
Click a GPA badge for the breakdown — it shows the caps applied and the college-double rule:
Minimum GPA for eligibility
CSU admission is test-blind — no SAT or ACT is used. Most campuses require a minimum CSU GPA around 2.5 for California residents (higher for non-residents). Meeting the minimum doesn't guarantee admission at impacted campuses, and SLO is far more selective — it uses a multi-factor review well above the minimums. Always check your target campus.
What's next
Your GPA is one piece. To stay on track you also need to complete the A-G subject requirements across all four years — something the 4-Year Course Planner tracks for you, alongside a live view of your CSU and SLO GPAs. Applying to UC too? See How to Calculate Your UC GPA.
Note: This calculator follows the published CSU and SLO GPA rules. Always verify your final GPA and eligibility with your school counselor and target campus.