How many words does a B2 speaker know? Vocabulary size by CEFR level
A1 to C2, with the word counts behind each level, what those numbers let you actually do, and why two people at the same CEFR level can differ by thousands of words.
A B2 learner typically recognises somewhere between 3,250 and 5,000 word families. That is the short answer, and like every vocabulary number it comes with an argument attached, because CEFR levels were never defined by word counts in the first place.
The Common European Framework describes what you can do with a language. Order a coffee, follow a lecture, argue a point without preparing it first. Vocabulary size correlates with those abilities but does not define them, so the counts below are what researchers and test makers observe at each level rather than official requirements.
The rough word counts per level
| CEFR | Name | Word families (receptive) | What it covers |
|---|---|---|---|
| A1 | Beginner | under 1,500 | greetings, numbers, immediate needs |
| A2 | Elementary | 1,500 to 2,750 | routine exchanges, simple past and future |
| B1 | Intermediate | 2,750 to 3,250 | most everyday topics, simplified reading |
| B2 | Upper-intermediate | 3,250 to 5,000 | unedited articles, films with effort |
| C1 | Advanced | 5,000 to 10,000 | novels, academic text, idiom |
| C2 | Proficiency | 10,000 and up | anything, including register and wordplay |
These are the bands our English vocabulary test uses. Other sources place the borders differently, and the gap between them is often larger than the gap between two adjacent levels. Milton’s work on CEFR vocabulary puts C2 nearer 5,000 word families, because those studies cap their word lists at the 5,000 most frequent families and cannot measure past the ceiling. Read the scale, not the decimal point.
Why B2 is the level everyone asks about
B2 is where a language stops being a subject and starts being a tool. It is the entry requirement for most English-taught degrees, the level IELTS 6.0 to 6.5 roughly corresponds to, and the point where employers stop asking about certificates. It is also where progress feels slowest.
The reason is arithmetic. Moving from A1 to A2 means adding around 1,000 word families, and they are frequent ones that appear constantly, so you meet them whether you study or not. Moving from B2 to C1 means adding several thousand, and each one shows up rarely by definition, since the rare ones are what is left. The same month of study buys less visible progress than it used to.
What the counts do not capture
Two learners can both test at 4,000 word families and perform completely differently.
Depth beats breadth past a point. Knowing that “run” means to move quickly is one thing. Knowing “run a business”, “run out”, “run into someone”, “in the long run” and “a run on the bank” is a different skill, and none of it adds to your word count.
Receptive is not productive. You recognise two to three times more words than you use. A learner who reads heavily can recognise 6,000 families and speak like someone with 2,000, which is why reading-only study plateaus in conversation.
Coverage is uneven. Someone who works in software knows the vocabulary of their field long before the general vocabulary that surrounds it, so their test result understates their reading ability at work and overstates it in a novel.
How to find your own number
Take a test rather than guessing. Self-estimates are wrong in both directions: beginners overestimate because they recognise words without recalling meanings, advanced learners underestimate because rare words feel like they should not count.
Our vocabulary size test samples words across the six bands in the table, mixes in invented words to catch over-claiming, and takes about two minutes. The Android app runs the same method on a larger word pool and keeps your history, so you can watch the number move over months rather than guessing whether it has.
Moving up a level
The word families between B2 and C1 are mostly academic and low-frequency general vocabulary, not technical jargon. Words like “constitute”, “arbitrary”, “albeit”, “notwithstanding”. They cluster in written English, so the fastest route is reading material slightly above your comfort level and looking up the words that block comprehension rather than every unknown one.
Volume matters more than method here. A learner reading an hour a day meets far more low-frequency vocabulary than one drilling lists for twenty minutes, and meets it in the contexts that make it stick.
Related reading: how many English words the average person knows and average vocabulary size by age.