The curriculum covers language and literature (English), mathematics, science, social studies, P.E., technology, art, music and drama.

Subjects offered for the IB Diploma include: The school also offers a two-week summer school programme for children aged 4–14 with activities centered on sports, English as a foreign language, or science classes.

Many CIS graduates have gained acceptances into leading colleges and universities primarily in the UK, US and Denmark.

[citation needed] Copenhagen International School is also a member of the Northwest European Council of International Schools (NECIS) which organizes yearly sports tournaments throughout North West Europe, for the age groups Under 12, Under 14, Junior Varsity, and Varsity in the sports Volleyball, Basketball, Soccer, Swimming, Rugby, Softball, Tennis and Track & Field.

It also had the school's varsity basketball team bringing back a first-place trophy from the NECIS tournament in 2010.