Choose Your Track
Our English vocabulary test offers two separate tracks depending on your goal. Both use the same adaptive engine, but draw from different word banks and produce different result formats.
Tells you your CEFR level (A1–C2) and estimated vocabulary size in word families. Ideal if you're learning English and want to know where you stand on the international proficiency scale.
Start CEFR test →Tests vocabulary from everyday words up to rare literary and academic terms (SAT/GRE level). Shows your score out of 42,000 and your percentile among native speakers.
Start native test →How the Test Works
Most vocabulary tests ask you to tick words you recognise from a list. This approach is easy to game — people tend to overclaim, inflating their scores. Our test is designed to be both accurate and resistant to guessing.
- You see a word. The test shows you one word at a time and asks whether you know it.
- If you claim to know it, you must define it. For words you say you know, the test immediately asks a multiple-choice comprehension question. This catches overclaiming and keeps scores honest.
- The algorithm adapts. Correct answers pull difficulty up; incorrect answers pull it down. The test converges on your true vocabulary ceiling within 20–30 questions.
- You receive your result. Your estimated vocabulary size, CEFR level (learner track), percentile rank, and a list of missed words with definitions.
Why two-phase testing? Recognition-only tests overestimate vocabulary by up to 20–30% because people instinctively claim words they half-recognise. By confirming with a definition question, we measure genuine knowledge rather than vague familiarity.
What Your Score Means
For English learners (CEFR track)
| CEFR Level | Vocabulary size | What this means in practice |
|---|---|---|
| A1 — Beginner | 500–1,000 words | Basic survival phrases; very simple conversations |
| A2 — Elementary | 1,000–2,000 words | Routine tasks; simple descriptions of background and routine |
| B1 — Intermediate | 2,000–3,500 words | Travel situations; simple connected text on familiar topics |
| B2 — Upper-Intermediate | 3,500–6,000 words | Fluent conversation; complex texts; professional use |
| C1 — Advanced | 6,000–9,000 words | Flexible use in academic and professional contexts |
| C2 — Proficient | 9,000–12,000 words | Near-native; nuanced expression; literary texts |
For native speakers
| Score range | Tier | Typical profile |
|---|---|---|
| Under 15,000 | Developing | Younger speakers; limited reading history |
| 15,000–22,000 | Functional | Average adult with moderate reading |
| 22,000–30,000 | Proficient | College-educated adult, regular reader |
| 30,000–38,000 | Advanced | Avid reader; graduate-level education |
| 38,000+ | Exceptional | Top 5% of native speakers |
For full context on what these numbers mean and how they compare to population averages, see our research guide to average vocabulary size.
The Science Behind the Test
Our test is built on the Brysbaert & Keuleers (2016) word frequency corpus — the largest English vocabulary dataset ever assembled, based on over 220,000 participants. This corpus gives us reliable frequency data on which words are known at which vocabulary size, allowing the adaptive algorithm to accurately estimate total vocabulary from a small number of test questions.
The adaptive algorithm is a simplified implementation of Item Response Theory (IRT), the same statistical framework used in major standardised tests like the GRE and TOEFL. IRT models both the difficulty of each test item and the ability of each test-taker simultaneously, producing estimates that are more accurate than simple right/wrong percentage scoring.
For learners, CEFR placement uses Nation's coverage model: vocabulary size is mapped to text coverage thresholds (the percentage of words in typical texts that a speaker knows), which in turn map onto the CEFR Can-Do descriptors. A B2 score, for example, corresponds to knowing enough words to cover approximately 95–98% of everyday spoken English.
Who Should Take This Test?
English learners preparing for exams
If you're preparing for IELTS, TOEFL, Cambridge (FCE, CAE, CPE), or any other English proficiency exam, our test gives you a fast, calibrated reading of your current CEFR vocabulary level. This helps you identify whether you're ready for your target exam or how far you still need to progress. The missed-word list after the test gives you a high-priority study list — exactly the words just above your current level.
Native speakers curious about their vocabulary
How large is your vocabulary compared to other native speakers? Most people significantly overestimate their own word knowledge. Our test gives you an honest, research-calibrated score — and most native speakers find the result either surprising or illuminating. The test also includes SAT and GRE level vocabulary, making it useful for anyone preparing for high-stakes verbal reasoning exams.
Students and teachers
Vocabulary size is one of the strongest predictors of reading comprehension, academic performance, and writing quality. The test can serve as a pre- and post-measure for vocabulary instruction, or as a diagnostic tool to identify vocabulary gaps before starting a course or reading programme.
Language researchers and enthusiasts
For anyone interested in lexicography, linguistics, or the psychology of language, the test offers a hands-on demonstration of how vocabulary size is measured — and a personal data point to compare against the published literature.
How Our Test Compares to Other Vocabulary Tests
| Test | Method | Accuracy | Time |
|---|---|---|---|
| vocabulary-test.com | Adaptive two-phase (recognition + definition) | ±3% | 8 min |
| Test Your Vocab (testyourvocab.com) | Recognition checklist only | ±10–15% | 3 min |
| VocabProfile (lextutor.ca) | Text paste analysis | Productive vocab only | Varies |
| Cambridge Vocabulary Level Tests | Fixed-difficulty multiple choice | Broad bands only | 10–15 min |
| Word Associates Test (WAT) | Written associations | High (research use) | 30+ min |
The two-phase design is our most important differentiator: by requiring a definition confirmation for claimed words, we eliminate the overclaiming bias that inflates scores on recognition-only tests. This makes scores on our test directly comparable to the Brysbaert (2016) benchmarks used in published research.
Tips for Getting an Accurate Score
- Be honest. If you're unsure whether you know a word, say no. The algorithm is calibrated for honest responses, and inflating your answers reduces accuracy.
- Don't skip words you actually know. If you're confident you know a word, say yes even if you can't immediately recall a perfect definition. The definition question will confirm it.
- Do not use a dictionary. Looking up words during the test defeats the purpose. The value of the result comes from measuring your current, unassisted vocabulary.
- Take the test when you're alert. Fatigue significantly affects word recognition, particularly for lower-frequency words. Mid-morning is the optimal time for most people.
- Take it more than once. Vocabulary size fluctuates slightly depending on your current state. Taking the test on two or three separate occasions and averaging the results gives you the most reliable estimate.
Ready to Test Your English Vocabulary?
Free · Adaptive · Instant results · No sign-up required
Start the free test →Frequently Asked Questions
How does the English vocabulary test work?
The test uses an adaptive algorithm that adjusts question difficulty based on your answers. It starts at medium difficulty, increases when you answer correctly, and decreases when you make mistakes. After 20–30 questions, it estimates your total vocabulary size with a margin of error of approximately ±3%. Words you claim to know are confirmed with a definition question — this prevents inflated scores from overclaiming.
How accurate is an online vocabulary test?
Well-designed adaptive vocabulary tests have a margin of error of ±5–10%. Our test is calibrated against the Brysbaert & Keuleers (2016) corpus — the largest English vocabulary dataset ever collected — and achieves approximately ±3% accuracy for most score ranges. This is significantly more accurate than simple recognition-checklist tests, which tend to overestimate scores by 20–30%.
What is a good score on an English vocabulary test?
For native speakers: 20,000–28,000 word families is average; 28,000–35,000 is strong; above 35,000 is excellent (top quarter of native speakers). For English learners: 3,500–6,000 words corresponds to B2 (conversational fluency); 6,000–9,000 to C1 (advanced); 9,000–12,000 to C2 (near-native). See our full guide to average vocabulary size by age and education for detailed benchmarks.
Can I use this test to find my CEFR level?
Yes. The learner track is specifically calibrated to the A1–C2 CEFR scale. After completing the test, you receive your estimated CEFR vocabulary level alongside your word count, so you can compare your result against the official CEFR benchmarks. For a detailed guide to what each level means, visit our CEFR vocabulary guide.
How long does the vocabulary test take?
Most users complete the test in 6–10 minutes. The test adapts to your level — if you score very high or very low consistently, it may finish in as few as 15 questions. Taking your time to answer accurately gives better results than rushing.
Is the vocabulary test free?
Yes, completely free. No account required. Both the native speaker track and the CEFR learner track are free and require no sign-up. Results are shown immediately after the test ends.
What language is the vocabulary test in?
All questions are in English. The test measures English vocabulary only. Both native English speakers and English learners can use it — they simply select the appropriate track at the start of the test.
Will my vocabulary test results improve with practice?
Vocabulary size grows primarily through reading, not through taking vocabulary tests. However, reviewing the missed-word list after each test and studying those words is a highly targeted way to improve — you're focusing exactly on the words just beyond your current knowledge boundary, which is the most efficient zone for learning.
Related Resources
- Average Vocabulary Size by Age and Education — research benchmarks to compare your score against
- CEFR Vocabulary Levels Guide (A1–C2) — what each CEFR level means and what vocabulary it requires
- SAT & GRE Vocabulary — the academic and literary vocabulary on the native speaker track
- Methodology & Science — how the adaptive algorithm and calibration work