C1 certificate is equivalent to Advanced English level. This is the 5th advanced level based on the European reference framework CEFR. So, if converted to IELTS, what is the equivalent of C1 level to IELTS? Let's find out the details in the next section.
1. What IELTS Score is Equivalent to C1 Level?
C1 is classified as Advanced level on the CEFR (Common European Framework of Reference for Languages). According to standardized estimates, a C1 certificate typically aligns with IELTS band 7.0 to 8.0. However, no official body allows direct conversion between C1 and IELTS or TOEIC or TOEFL scores. The table below is for reference only:
CEFR Level | IELTS Band | TOEIC (10–990) | TOEFL Score | Vietnam Framework |
|---|---|---|---|---|
C2 | 8.5–9.0 | 910+ | 100 | Level 6 |
C1 | 7.0–8.0 | 850 | 80–99 | Level 5 |
B2 | 5.5–6.5 | 600 | 61–79 | Level 4 |
B1 | 4.0–5.0 | 450 | 45–60 | Level 3 |
A2 | 3.0–3.5 | 400 | 40 | Level 2 |
A1 | 1.0–2.5 | 255 | 19 | Level 1 |
2. Similarities and Differences Between C1 and IELTS Band Scores
Common Features
Certificate validity: typically 2 years (but some institutions accept C1 indefinitely).
High-level abilities:
Understand and interpret complex texts, including academic and literary content.
Think and speak fluently in English with minimal hesitation.
Effectively communicate opinions and gather information in important tasks.
Adapt language to both professional and social settings.
Write well-structured essays or reports without using a dictionary for complex topics.
Perform confidently in English-speaking environments.
Key Differences
Feature | C1 Certificate | IELTS Band 6.0–6.5 |
|---|---|---|
Purpose | Graduation, teaching, linked programs, scholarships, work | University admission, immigration, visa, global recruitment |
Accepted Use | Education and professional use in some countries | Global recognition in over 145 countries and 11,000+ organizations |
Issuing Institutions | Vietnamese universities, IDP, British Council | IELTS-specific organizations (IDP, British Council) |
Fee in Vietnam | 1.5–1.8 million VND | ~4.7 million VND |
3. Tips for IELTS Preparation if You Already Have C1
If you already hold a C1 certificate, aiming for an IELTS band 6.5 or higher is practical. Use your existing English command to streamline your IELTS preparation:
How to Strengthen Your IELTS Performance:
Become familiar with the IELTS format and scoring:
Listening (40 mins): 4 sections, 40 questions
Reading (60 mins): 3 passages, 40 questions
Speaking (11–14 mins): Interview, long turn, and discussion
Writing: Task 1 (report/letter) & Task 2 (essay of approx. 250 words)
Practice with:
Official IELTS materials from IDP or British Council
Simulated full‑length tests to understand pacing
Create a study roadmap:
Diagnostic tests → set target band → plan topics and time
Focus on individual skills and supplementary pairs (e.g. listening‑speaking, reading‑writing)
Take mock exams before and after preparation to track improvement.
Join workshops or test simulations offered by official organizers.
Final Thoughts
A C1 certificate roughly corresponds to IELTS band 7.0 to 8.0, though official conversions are not permitted. Having a C1 foundation gives you a strong advantage, but you still need targeted IELTS preparation to reach higher bands. Set a structured learning plan, practice all four skills, and take mock tests under exam conditions. With a solid approach and focused effort, you can maximize your IELTS success.Curious about B1 or B2 levels vs IELTS? Or want to compare CEFR, TOEIC, and IELTS further? Explore our resources to find the right fit for your goals!Ask ChatGPT