Use IMA's AMCAS, AACOMAS and TMDSAS GPA calculator to estimate your cumulative GPA and your science GPA under each application service's rules. You do not enter a GPA on any of these applications. You enter your coursework, and AMCAS, AACOMAS and TMDSAS each calculate your GPAs from it, so the calculator's results are estimates and the services' verified numbers are the official ones.
The calculator page also compares the three services' rules side by side, including which courses count as science, how plus and minus grades are valued, how repeated courses are treated and what Texas Academic Fresh Start does, with links to the current AAMC, AACOMAS and TMDSAS instructions. If you have trouble using the calculator, message us here and our team will help.