Definition · Plain-language
Academic year
An academic year is the annual period of instruction at an educational institution, divided into terms or semesters according to the institution's calendar system.
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Semester, trimester and quarter systems
The semester system, most common in US higher education, divides the academic year into two main terms of roughly 15–16 weeks each — the fall semester (approximately August to December) and the spring semester (January to May). Many institutions add an optional summer session. The quarter system, used at some major US universities including UCLA and the University of Chicago, divides the year into four ten-week quarters, typically autumn, winter, spring and summer, with students usually completing three of four. A trimester system divides the year into three equal terms.
UK academic terms
The UK academic year runs from September to June and is divided into three terms rather than semesters. Term names vary by institution type: most universities use autumn, spring and Easter (or summer) terms, while the ancient universities of Oxford and Cambridge use the names Michaelmas (autumn), Hilary or Lent (spring) and Easter or Trinity (summer). UK terms are typically shorter than US semesters — around eight to ten weeks — but contact time is concentrated. Many UK universities also operate modular structures with assessments at the end of each semester.
Credit accumulation by system
The choice of calendar system affects how quickly credits accumulate. In a semester system, a full-time student typically takes four to five courses per semester, accumulating 15–18 credit hours per term. Quarter courses carry fewer credit hours individually (usually 3–5 quarter credits), but students take more courses per year, so total annual credit accumulation is broadly comparable. When transferring between institutions using different systems, credit conversion is necessary — US semester credit hours and UK CATS credits (ten hours of learning per credit) are not directly interchangeable.
Key facts
At a glance
- US semester system: fall (Aug–Dec) and spring (Jan–May), each ~15–16 weeks
- UK academic year: September–June in three terms
- Oxford and Cambridge terms: Michaelmas, Hilary/Lent, Easter/Trinity
- Quarter system: four ~10-week quarters (e.g. UCLA, University of Chicago)
- Full-time US load: typically 15–18 credit hours per semester
- UK CATS credits: 10 notional learning hours per credit; not directly equivalent to US credit hours
Common misconceptions
What people often get wrong
Often heard: All universities use the same academic calendar.
Actually: Academic calendars vary significantly between countries, systems and individual institutions. US institutions use semesters, quarters or trimesters; UK universities use three-term systems with varying term names and lengths; many other countries follow their own national conventions tied to the local school year or climate.
Often heard: A semester and a term are the same thing.
Actually: A semester is a specific type of academic term lasting roughly 15–16 weeks, used in the two-semester system most common in the US. A "term" is a broader word that can refer to a semester, a quarter, or any of the three terms in a UK academic year. Not all terms are semesters.
Often heard: Quarter units and semester units count the same toward a degree.
Actually: Quarter credit hours carry less weight individually than semester credit hours. A rough conversion is that one semester credit equals 1.5 quarter credits. When transferring from a quarter-system to a semester-system institution, credits must be converted — approximately 45 quarter credits equal 30 semester credits.
Common questions
FAQ
When does the academic year start in the UK and the US?+
In the US, the academic year typically begins in late August or early September with the fall semester and ends in May. In the UK, the academic year usually begins in late September and ends in June, though exact dates vary by institution. Both differ from the calendar year (January–December), and some institutions offer a January intake that starts a second cohort mid-year.
What is the difference between a semester and a quarter system?+
A semester system divides the year into two main terms of roughly 15–16 weeks each. A quarter system divides it into four ten-week quarters, with students typically attending three of the four. Quarter courses cover material faster; semester courses allow more depth per unit. Credit accumulation across the year is broadly similar, but individual courses carry fewer credits in the quarter system, requiring conversion when transferring.
What are the Oxbridge term names?+
Oxford and Cambridge use traditional Latin-derived term names. At Oxford the three terms are Michaelmas (autumn, October–December), Hilary (spring, January–March) and Trinity (summer, April–June). At Cambridge they are Michaelmas, Lent and Easter. These terms are notably short — eight weeks at Oxford — with much independent study expected outside formal term time.
