How Many English Words You Need at Each CEFR Level
Based on vocabulary research (Nation, Schmitt, Laufer) and Clue's library of ~3 500 graded English books, podcasts and YouTube channels.
Free to cite. Last updated: June 2026.
| CEFR | Word families | Coverage of natural text | Reading hours to acquire |
|---|---|---|---|
| A1 (Beginner) | 500–800 | ~75% | 20–30 h |
| A2 (Elementary) | 1 000–1 500 | ~80% | 40–60 h |
| B1 (Intermediate) | 2 000–2 750 | ~84% | 90–130 h |
| B2 (Upper-intermediate) | 3 250–4 000 | ~88% | 180–250 h |
| C1 (Advanced) | 5 000–7 000 | ~92% | 300–450 h |
| C2 (Mastery) | 8 000–16 000+ | ~96–98% | 500+ h |
What "word family" means
A word family is a headword plus its inflected and derived forms — "happy / happily / happier / happiest / unhappy" is one family. Counts in this article are word families, not raw word forms. Vocabulary research consistently uses families because adult learners who know "happy" can usually decode "happily" without explicit study.
Raw word counts are 2–3 × higher than family counts. When someone says "native speakers know 30 000 words," that usually means raw forms; the family count is closer to 17 000–20 000.
Coverage and the frequency curve
English word frequency follows a steep curve. The most-frequent 1 000 word families cover ~75 % of every page of natural text. The next 1 000 add only ~5 %. By the time you know 8 000 families, you cover ~95 % of casual reading — the threshold researchers call "comfortable reading without a dictionary."
- Top 1 000 word families → ~75 % coverage
- Top 2 000 → ~80 %
- Top 3 000 → ~84 %
- Top 5 000 → ~88 %
- Top 8 000 → ~94 %
- Top 16 000 → ~98 %
For comprehension without lookup, ~98 % coverage (≈ 1 unknown word every 50) is widely cited as the threshold. Below ~95 %, lookups become frequent enough to break the flow of reading.
Why the spread within a level
The ranges (e.g. C1 = 5 000 – 7 000) reflect three realities: the CEFR descriptor is qualitative, not quantitative; passive vocabulary (recognised) outsizes active vocabulary (produced) by ~2 × at every level; and domain matters — a C1 lawyer and a C1 engineer share a B2 core but diverge sharply on specialised vocabulary.
For practical planning, treat the lower end of each range as the threshold to "function at this level" and the upper end as "fluent at this level."
How to acquire vocabulary efficiently
Three findings consistently outperform other approaches in the meta-analyses:
- Extensive reading at level +1. Read material where you understand ~95 % of words. You'll pick up the rest in context.
- Repeated encounters. Research suggests 6 – 12 meaningful exposures to a new word for it to enter your active vocabulary. Frequent reading delivers this naturally; flashcard apps engineer it explicitly.
- Friction-free lookup. Stop and look up unknown words — but the lookup must take ≤ 2 seconds, or you'll skip too many of them and lose acquisition.
Clue is built around the third point: tap any word in any podcast, YouTube video or EPUB book and get an instant translation from a 27 000-word offline dictionary, with optional flashcard save. Free on iOS. App Store →
Sources and citation
The numbers in this article are drawn from:
- Nation, I. S. P. (2013). Learning Vocabulary in Another Language (2nd ed.). Cambridge University Press.
- Schmitt, N. (2014). Size and Depth of Vocabulary Knowledge. Language Learning, 64(4), 913–951.
- Laufer, B., & Ravenhorst-Kalovski, G. C. (2010). Lexical threshold revisited. Reading in a Foreign Language, 22(1), 15–30.
- Cambridge English (2020). Cambridge English Vocabulary Profile.
- Council of Europe (2020). Common European Framework of Reference for Languages: Companion Volume.
To cite this article: "How Many English Words You Need at Each CEFR Level," Clue, June 2026. https://tryclue.app/tools/words-per-level