How many grades are there in elementary school middle and high school?

The number of grades varies slightly by location, but generally:

* Elementary School: Grades K-5 (or sometimes K-6) — totaling 6 or 7 grades.

* Middle School: Grades 6-8 (or sometimes 7-8) — totaling 3 or 2 grades.

* High School: Grades 9-12 — totaling 4 grades.