Adaptive Testing
Word frequency sampling adapts to your level in real time.
How large is your vocabulary?
The most scientific vocabulary test. 20+ languages supported.
Where do you stand?
Most people significantly overestimate their vocabulary size. Do you?
Native SpeakerThe ceiling
20,000+ wordsC2 LevelNear-fluent
~16,000 wordsB1–B2 StudentConversational
4,000–8,000 wordsA1–A2 BeginnerJust starting
500–2,000 wordsBased on published vocabulary research (Nation, 2001; Goulden, Nation & Read, 1990). English estimates shown.
Pick a language to start
How it works
1
Choose a Language
Pick from 7 languages to test your vocabulary.
2
Answer Word Prompts
Our adaptive test presents ~40 words at varying frequency levels.
3
Get Your Score
Receive an estimated vocabulary size with a confidence range.
7
Languages
~40
Words Per Test
✓
Science-Backed
Why Vocalibur
No Signup Needed
Start testing immediately. Save results later with an account.
7 Languages
Test your vocabulary in 7 major languages from around the world.
Calibrated Scores
Results are benchmarked against native speaker vocabulary data.
What people say
I come back every few weeks to retest myself. Seeing my score actually go up over time is incredibly motivating — it's the only way I know my studying is paying off.
As a mathematician, I care deeply about methodology. This is the most rigorous and impartial vocabulary test I've found online. The statistical approach is sound and the results are honest.
I use Vocalibur with my whole team. It's become a fun benchmark we run quarterly — you'd be surprised how much a larger vocabulary correlates with clearer written communication at work.