How CASPA actually calculates your science GPA
Your school's transcript shows your science GPA one way. CASPA shows it another. The numbers diverge, sometimes by a full letter grade, and the gap is one of the two or three things that quietly decides whether your application reads as competitive or borderline. This piece walks through how CASPA's verifier actually computes your science GPA - and where applicants lose points without realizing it.
The first thing to understand
The science GPA that shows up on your school's transcript is not the science GPA CASPA is going to calculate. Your university uses one definition of "science." CASPA uses another. (If your undergrad was on the quarter system, the same gap shows up for a different reason - see what quarter credits do to your CASPA GPA.) The two definitions overlap, but they don't match - and where they diverge is where your numbers shift.
CASPA's working definition is BCPM: Biology, Chemistry, Physics, and Math. Every course you've ever taken gets reclassified into one of those four buckets, into Behavioral Science, into Other Science, into Non-Science, or into a smaller set of administrative categories. Your school may classify a Biostatistics course as a Math credit on your transcript. CASPA might call it Math, or it might call it Behavioral Science, depending on how it was titled and what department offered it. The reclassification is not negotiable, and it's not always obvious until your application comes back verified.
What "science" actually means here
The four BCPM buckets are the ones that move your science GPA. Inside CASPA's coursework section, every entry has a Subject Category dropdown - that's where the reclassification happens. The categories that count as science for the science GPA are:
- Biology - Biology, Microbiology, Anatomy, Physiology, A&P, Genetics, Cell Bio, Molecular Bio, Immunology, Pathophysiology, Neuroscience, Botany, Zoology, Marine Bio.
- Chemistry - General Chem, Organic Chem, Biochem, Analytical Chem, Physical Chem.
- Physics - Physics, Astronomy when it's calculus-based, some engineering physics.
- Math - College Algebra, Calculus, Statistics, Linear Algebra. The behavior here is messier than the other three because Statistics courses can sometimes get reclassified to Behavioral Science depending on the title and department.
Behavioral Science (Psychology, Sociology, Anthropology) does not count toward the science GPA. Other Science (Nutrition, Kinesiology, Exercise Physiology in some forms) does not count toward the science GPA. This catches applicants by surprise constantly. A Kinesiology major can walk into the cycle thinking they have a 3.7 science GPA based on their major, see CASPA come back with a 3.4, and not understand the gap until they look at how each course was reclassified.
How retakes actually work
CASPA does not do what your school does on retakes. Most universities replace the lower grade with the higher grade and recalculate your GPA from there. CASPA averages both attempts. Both grades count, both credits count, both go into the cumulative and the science GPA if the course is BCPM.
This matters more than people expect. If you got a C in Organic Chem, retook it, and got an A, your school's transcript will show a 4.0 in Organic Chem. CASPA will show a 2.0 and a 4.0 averaged together - a 3.0 in that course, weighted across both credit hours. Your transcript shows what your school wants you to see. CASPA shows what every other PA program is going to see.
The implication for school list strategy is that retake math is easy to underestimate, and the operating numbers programs actually admit on are higher than what they publish - see the minimum GPA isn't the bar. A grade improvement that looks decisive on your transcript is half-decisive on CASPA, and that's before anyone weighs your second attempt. What I'd want you to hold onto here is that the only way to know your actual CASPA-verified science GPA is to do the same averaging math CASPA is going to do - covered step-by-step in predicting your CASPA GPA before you submit - which means going through every course you've retaken and computing the weighted average yourself.
What withdrawals do
Withdrawals on your transcript come in a few flavors. The two CASPA cares about are:
- W - counted as 0 credit hours and 0 quality points. They show up on your CASPA report but don't move your GPA. They do raise eyebrows in volume.
- WF - withdrawal-failing. Counted as an F. Moves your GPA the same way an F would.
Some schools assign a W when an applicant later expects something closer to a WF, and the verifier catches it on transcript review. The reclassification adjusts your GPA accordingly. There's no negotiating it once it's posted, but it's worth knowing what your transcript actually says before you pay the application fee. Three or four W's in a single semester also tend to come up in interviews, but that's a separate conversation.
Advanced standing, AP, IB, CLEP
Credit you got from AP exams, IB exams, or CLEP doesn't carry a grade. Those credits typically appear on your CASPA report as "advanced standing" credits with no grade attached, and they don't move your GPA - but they don't move your science GPA either, even if the underlying subject is BCPM. Most PA programs are explicit about whether they accept AP credit for prereqs. Some don't, especially for the heavy science prereqs like General Chemistry and General Biology. The Program Spreadsheet has this column populated for every program.
The Last 60 GPA
This one is the one most applicants miss going into their first cycle. CASPA computes a Last 60 GPA - the GPA of your most recent 60 semester credit hours. Programs use this in their holistic review more than the cumulative because it's a recency signal. A 3.0 cumulative with a 3.7 Last 60 reads very differently than a 3.0 cumulative with a 3.0 Last 60. The first applicant is on a trajectory. The second is still in the same place they started.
If you're rebuilding from a low first-degree GPA, the Last 60 is the GPA you're working on. Every credit you take going forward is in that calculation, and the only way out is sustained performance over the most recent 60 hours of credit. The reapplicant guide walks through how to actually plan this.
How to know your CASPA-verified GPA before you submit
This is where the Transcript Mapper comes in. It takes your transcripts as PDFs, walks every row through CASPA's classification logic, applies the retake averaging and the W vs WF distinction, and predicts what your CASPA-verified cumulative, science, non-science, Last 60, post-bacc, and graduate GPAs are going to look like - before you pay any fees and before you find out the hard way. The mapper now lives inside the Application Dashboard as step one - the engine works (validated against real CASPA results inside 0.004 on the first ground-truth case) but accuracy is being refined as more transcripts go through it. Your submission becomes part of the calibration set, and you get the predicted GPAs back in roughly five minutes.
What I didn't realize when I was applying
What took me a few cycles to figure out is that the science GPA on my transcript and the science GPA on my CASPA-verified application were two different numbers, and that gap was the difference between programs treating my application as competitive vs. borderline. If I'd known what CASPA was actually going to compute before I submitted, I'd have applied to a different list of schools, and probably saved a cycle. That's the gap the mapper is built to close.
Frequently asked
Does CASPA round?
CASPA reports GPAs to two decimal places. The internal calculation carries more precision, but the displayed value is two decimals. A 3.564 internal calculation shows as 3.56.
Can I appeal a reclassification?
Yes, but the bar is high. CASPA's policy is that the verifier's classification stands unless there's documentation from the registrar that the course was misclassified. The path is to email CASPA support with your supporting documentation. It takes weeks. Plan around the assumption it won't move.
What if my transcript shows credit for a class I didn't take?
That's a transcript error and your registrar fixes it, not CASPA. Contact your school's registrar before you submit. Once your application is verified, fixing it requires a transcript update and a re-verification, which takes weeks.
How does the Transcript Mapper handle retakes?
It applies the same averaging math CASPA does. Both attempts count, both grades go into the calculation, weighted by credit hours. The mapper flags every retake on its row-by-row output so you can see exactly what's being counted.