High school in the United States typically includes grades 9 through 12. These correspond to the following grade levels and common names:
- 9th grade: Freshman year (students are usually about 14-15 years old)
- 10th grade: Sophomore year (about 15-16 years old)
- 11th grade: Junior year (about 16-17 years old)
- 12th grade: Senior year (about 17-18 years old)
Students attend high school after completing middle school or junior high, which generally covers grades 6-8 or 7-8 depending on the district
