What does a 3.4 GPA convert to in ACT score?

There's no direct conversion between a GPA and an ACT score. They measure different things and are scored on different scales. A GPA reflects your overall performance in high school classes, while the ACT is a standardized test focusing on specific subject areas. A 3.4 GPA might correlate with a range of ACT scores depending on the student's school's grading rigor and the student's strengths and weaknesses on the test.