How many words does a B1 speaker know?

About 1,000 to 2,000 word families, roughly 1,600 to 4,000 individual words. That's enough to follow the main point and keep everyday conversations moving.

On vocabulary tests that sample the 5,000 most common dictionary words, B1 learners score about 2,750 to 3,250. Every published number is real; they just count different things. That's why one article says 2,000 and another says 3,000.

Why every source gives a different number

The Common European Framework of Reference (CEFR) itself publishes no official word counts for any level, A1 through C2. Every number you'll find comes from vocabulary research, and the spread comes from the unit, not the research. Some studies count word families, some count lemmas (a dictionary headword plus its inflections), and some count every individual word. One family is roughly 1.6 to 2 individual words, so the same vocabulary produces very different totals depending on how you count.

The main measurements behind the numbers you'll see:

2,750 to 3,250 is Milton and Alexiou's measured band for B1 learners on the X_Lex test, which samples the 5,000 most common lemmas. It's a score out of 5,000, not a total vocabulary size.

1,000 to 2,000 word families is Paul Nation's suggested B1 range in his CEFR mapping. These high-frequency families carry much of everyday conversation and simple storytelling.

2,000 words is the popular doubling-table figure for B1. It is an internet extrapolation, not a figure in the research. The table simply doubles its total at every CEFR level, and usually leaves the unit unclear.

Two caveats. These are receptive counts from English-language studies: passive vocabulary you recognize when reading or listening. The vocabulary you can actively use in speech is smaller. And educated native speakers carry well past 15,000 word families. B1 is not about closing that gap. It is about making a compact, useful core work in ordinary life.

Why does B1 feel bigger than the numbers say?

B1 is where the core 2,000 word families start doing real work in conversation. They turn isolated phrases into explanations, stories, and follow-up questions. The number is still modest, but high-frequency words appear everywhere. When you can retrieve them quickly, the language suddenly feels much larger.

How many words do you need at the other levels?
See the real numbers for A1 · A2 · B2 · C1 · C2.

Sources: Milton and Alexiou, vocabulary size across the CEFR levels · Nation, Vocabulary and the CEFR · ILR, vocabulary size and reading coverage.