Your grade point average is one of the most important numbers in your health professions application, and it is also one of the most misunderstood. Different application systems calculate GPA differently, and the GPA displayed on your college transcript may not match the GPA that appears on your AMCAS®, AACOMAS®, or other centralized application. Understanding how application services calculate your GPA, which courses count toward your science GPA, and what to do if your GPA is lower than you want it to be gives you the information you need to plan strategically. This guide covers GPA calculation methods across major application systems, the difference between cumulative and science GPAs, grade replacement policies, and how to strengthen a low GPA.
How AMCAS Calculates Your GPA
AMCAS® (the MD application service) recalculates your GPA from scratch using every undergraduate course you have ever taken, regardless of your institution. This means that if you took a course at a community college, transferred to a university, and later took a post-baccalaureate course at a third institution, all of those grades are included in your AMCAS® GPA. AMCAS® does not recognize grade replacement or grade forgiveness policies. If you repeated a course and your school replaced the original grade on your transcript, AMCAS® still counts both the original grade and the repeat grade in your GPA calculation. This is a critical difference that catches many applicants by surprise.
AMCAS® calculates four separate GPAs: cumulative GPA (all undergraduate courses), science GPA (biology, chemistry, physics, and math courses, abbreviated BCPM), non-science GPA (all courses not classified as BCPM), and total GPA. Your science GPA receives particular scrutiny from admissions committees because it reflects your performance in the courses most directly relevant to medical school. A strong science GPA can partially compensate for a lower cumulative GPA, and vice versa.
How AACOMAS Calculates Your GPA
AACOMAS® (the DO application service) uses a similar methodology to AMCAS® but with one important difference: AACOMAS® does recognize grade replacement for repeated courses. If you retook a course and earned a higher grade, AACOMAS® replaces the original grade with the new one in your GPA calculation. This policy means that your AACOMAS® GPA may be higher than your AMCAS® GPA if you have repeated courses with improved grades. If you are applying to both MD and DO programs, calculate both GPAs separately so you understand how each system evaluates your academic record.
Science GPA: Which Courses Count
The BCPM (Biology, Chemistry, Physics, Math) classification determines which courses contribute to your science GPA. Biology includes general biology, cell biology, molecular biology, genetics, anatomy, physiology, microbiology, ecology, evolution, and similar life science courses. Chemistry includes general chemistry, organic chemistry, biochemistry, analytical chemistry, and physical chemistry. Physics includes introductory physics and advanced physics courses. Math includes calculus, statistics, linear algebra, and differential equations. Courses like psychology, sociology, and public health are generally classified as non-science even though they contain scientific content. If you are unsure how a specific course will be classified, check the AMCAS® course classification guide on the AAMC® website.
Calculating Your Own GPA
To estimate your AMCAS® GPA before you apply, use this method. List every undergraduate course you have taken at every institution. Assign each grade its quality points (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). Multiply each course’s quality points by the number of credit hours. Sum the total quality points and divide by the total credit hours. Remember to include both the original and repeat grade for any course you retook (for AMCAS®). For your science GPA, repeat this process using only BCPM courses. Several free online GPA calculators are designed specifically for AMCAS® and AACOMAS® calculations, and they can help you estimate your application GPA before you submit.
What to Do if Your GPA Is Low
Upward Trend: If your GPA improved significantly over time (for example, a rough freshman year followed by strong performance in junior and senior year), admissions committees will notice this trend. Many schools look at your most recent 30 to 60 credit hours separately. A strong upward trend demonstrates resilience, maturation, and the ability to improve, all qualities that medical schools value. If your overall GPA is below average but your recent performance is strong, highlight this trajectory in your application.
Post-Baccalaureate Programs: If your GPA is below competitive thresholds and you have already graduated, a formal post-baccalaureate pre-med program or a special master’s program (SMP) can provide an opportunity to demonstrate academic capability. Post-bacc programs allow you to retake prerequisite courses or take advanced science courses to improve your science GPA. SMPs involve master’s-level coursework (sometimes alongside first-year medical students) and provide a strong signal of academic readiness if you perform well. See our post-baccalaureate programs page and special master’s programs page.
DO Application Advantage: Because AACOMAS® recognizes grade replacement, retaking courses with improved grades has a direct positive impact on your AACOMAS® GPA. If you earned a C in organic chemistry and retook it for an A, your AACOMAS® GPA reflects only the A. This policy makes DO programs particularly accessible for students who had early academic struggles but demonstrated improvement. See our DO pathway page.
Strong MCAT® Score: A strong MCAT® score can partially offset a lower GPA by demonstrating current mastery of the material. Admissions committees often look at GPA and MCAT® together. An applicant with a 3.3 GPA and a 518 MCAT® tells a different story than an applicant with a 3.3 GPA and a 500 MCAT®. If your GPA is below average, investing extra time in MCAT® preparation can be strategically valuable. See our MCAT® prep guide.
GPA Calculations for Other Application Systems
CASPA® (PA programs), AADSAS® (dental schools), OptomCAS® (optometry), and PharmCAS® (pharmacy) each have their own GPA calculation methods and course classification rules. Some recognize grade replacement; others do not. Some calculate a science GPA; others use different course groupings. Before you apply, review the specific GPA calculation methodology for your target application system. See our application guides for CASPA®, AADSAS®, OptomCAS®, and PharmCAS®.
Understanding Credit Hour Weighting: GPA calculations are weighted by credit hours. A grade in a 4-credit course affects your GPA twice as much as a grade in a 2-credit course. This means that performing well in your high-credit science courses (general chemistry, organic chemistry, biology, physics) has a disproportionately large impact on your science GPA. Conversely, a poor grade in a 4-credit course is harder to offset than a poor grade in a 2-credit course. When planning your course load, consider how each course’s credit hours will affect your cumulative and science GPAs.
Grade Trends and Context: Admissions committees look at more than your cumulative GPA number. They examine your grade trends over time, your performance in upper-level science courses versus introductory courses, your course load difficulty (were you taking 12 credits of easy electives or 18 credits of hard sciences?), and whether any dips in performance have explanatory context (illness, family emergency, working full-time). If you had a difficult semester, you may have the opportunity to explain it in a secondary essay or addendum. One bad semester does not define your academic record if the rest of your transcript shows strong and consistent performance. Focus on what you can control going forward: your performance in current and future courses, your MCAT® preparation, and the overall trajectory of your academic record.
References
Association of American Medical Colleges (AAMC). “AMCAS GPA Calculation.” AAMC, 2025. https://students-residents.aamc.org/applying-medical-school-amcas. Accessed March 2026.
American Association of Colleges of Osteopathic Medicine (AACOM). “AACOMAS Application.” AACOM, 2025. https://www.aacom.org/. Accessed March 2026.