C1 Advanced vs IELTS Academic: format, scores and which English test to take
C1 Advanced and IELTS Academic are both accepted as proof of English for university study, and Cambridge University Press & Assessment is involved in both: it runs C1 Advanced and is one of the owners of IELTS. They are built very differently. IELTS measures any level on one test and reports a band from 0 to 9. C1 Advanced is aimed at one level, C1, and reports a Cambridge English Scale score with a certificate that does not expire. This guide compares them paper by paper, shows how their scores line up, and helps you choose.
Side by side
| C1 Advanced | IELTS Academic | |
|---|---|---|
| Aimed at | CEFR level C1 (reports B2 to C2) | All levels; band 0 to 9 |
| Papers | Reading and Use of English, Writing, Listening, Speaking | Listening, Reading, Writing, Speaking |
| Total time | About 4 hours | 2 hours 45 minutes |
| Reading | 90 minutes with Use of English, 56 questions in 8 parts | 60 minutes, 40 questions on 3 long texts |
| Grammar and vocabulary | A separate score: Use of English | Not tested separately |
| Writing | 90 minutes: an essay and one of a letter, proposal, report or review, 220 to 260 words each | 60 minutes: Task 1 (describe visual information) and Task 2 (an essay) |
| Listening | About 40 minutes, 30 questions, each recording heard twice | About 30 minutes, 40 questions, each recording heard once |
| Speaking | 15 minutes, with a partner and two examiners | 11 to 14 minutes, one to one with an examiner |
| Scores | Five scores on the Cambridge English Scale, 142 to 210, and an overall score | Four bands from 0 to 9 in half bands, and an overall band |
| Certificate | Does not expire | Each organisation decides how recent a result must be |
| Format | On paper or on a computer | On paper or on a computer |
How the scores compare
Cambridge publishes the C1 Advanced score needed for each IELTS band:
| IELTS band | C1 Advanced score | C1 Advanced result at that score |
|---|---|---|
| 7.5 | 191 | Grade C, C1 |
| 7.0 | 185 | Grade C, C1 |
| 6.5 | 176 | Certificate at B2 |
| 6.0 | 169 | Certificate at B2 |
| 5.5 | 162 | Certificate at B2 |
| 5.0 | 154 | No certificate |
Read it this way: if a course asks for IELTS 7.0, a C1 Advanced score of 185 is the comparable figure, but only if the course accepts C1 Advanced at all. Cambridge notes that IELTS is mapped to its scale but does not report on it. Always check the course's own page, which may also set a minimum per skill.
Which test suits you?
C1 Advanced may suit you if:
- You are already at or near C1 and want a certificate that does not expire, for example for work or a CV.
- You are stronger at grammar and vocabulary: Use of English is a fifth of your result.
- You find it easier to talk with another candidate than to answer an examiner alone.
- You like hearing each recording twice.
IELTS Academic may suit you if:
- A university, employer or visa office names IELTS specifically.
- You need a result soon and want a shorter test: 2 hours 45 minutes against about 4 hours.
- Your level is still around B2. On IELTS every half band counts; on C1 Advanced an overall score under 180 gives a B2 certificate, not a C1 one.
- You prefer a one-to-one speaking test.
Either way, check acceptance first. The test you take must be one your university or employer accepts, at the score they ask for. That decides more than format.
What to practise for each
| Skill | C1 Advanced | IELTS Academic |
|---|---|---|
| Grammar and vocabulary | Daily Use of English Parts 2 to 4 (examples) | Range and accuracy within writing and speaking |
| Reading | Long texts, gapped paragraphs, cross-text opinions | Long academic texts, True/False/Not Given, headings |
| Writing | Essay plus report, proposal, review or letter (plans) | Describing a chart or process, and an argument essay |
| Listening | Opinion and attitude across speakers | Detail, spelling of names and numbers, heard once |
| Speaking | Interaction with a partner, reaching a decision | Fluency in a one-to-one interview |
Try a full test of each before you book: our free C1 Advanced mock tests and IELTS mock tests are timed like the real exams and show a score for each skill.
Useful links
- Comparing scores to IELTS (cambridgeenglish.org, PDF)
- C1 Advanced exam format (cambridgeenglish.org)
- Free C1 Advanced mock tests
- C1 Advanced exam dates
- IELTS: test dates and how to book
- C1 Advanced score calculator
Frequently asked questions
Is C1 Advanced harder than IELTS?
They measure differently. C1 Advanced is aimed at one level and its tasks are set at C1; IELTS uses one test for all levels. For a C1 certificate you need an overall 180, which Cambridge's table places between IELTS 6.5 and 7.0.
What IELTS band is C1 Advanced equal to?
Cambridge's table puts 185 at IELTS 7.0 and 191 at IELTS 7.5. A Grade C (180 to 192) covers roughly IELTS 6.5 to 7.5.
Is C1 Advanced accepted instead of IELTS?
Many universities and employers accept it, but each decides for itself. Check the course or employer's own requirements before booking.
Does IELTS have a Use of English paper?
No. IELTS has four papers; grammar and vocabulary are marked within Writing and Speaking.