What Is a Trimester?

A trimester is a term that divides the academic year into three roughly equal parts, each usually 12 to 14 weeks long. Some universities use trimesters instead of two semesters, and many professional schools, such as law and medicine, organize studies in this way. Terms are often named by season, such as fall, winter and spring, or simply Trimester 1, 2 and 3.

How trimesters work

Students typically take three to five courses in each trimester, and each course meets for a shorter time than a semester course. Full-time students who study all three trimesters may finish in about three calendar years for a bachelor's degree. Others take two of the three each year and have a long break.

Trimester schedules often include a break of several weeks between terms, and some institutions offer a shorter summer term as well. Because terms are shorter, the pace is faster than a semester, and a missed week matters more.

Advantages

• Faster completion for students who study year-round.
• Flexibility, with options to take a term off, work or study abroad.
• More chances to retake or catch up on courses.
• Focus, since you take fewer courses at one time.

Things to watch

• Compressed schedule. Assignments and exams come quickly.
• Credit conversion. When transferring to a semester college, credits are converted, and course equivalence may differ.
• Financial aid. Aid calculations are based on term enrollment, and a three-term year may affect timing and limits.
• Housing and activities may follow a different cycle.

Related ideas

Do not confuse a trimester with the three terms of a UK academic year, which are often called autumn, spring and summer terms. In the UK, undergraduate courses may use terms or two semesters.

Related terms

See semester, quarter system, term, academic calendar and summer session.