If you are learning a language by reading, the level of the text matters more than anything else.
Read something too easy, and you don't encounter enough new language. Read something too hard, and you lose the thread — comprehension drops, frustration rises, and you stop. The research is clear on this: there is a specific zone where reading does the most good.
The 95% rule
Language acquisition researchers have found that you need to understand approximately 95% of the words in a text for comfortable reading and effective vocabulary learning (Schmitt, Jiang & Grabe, 2011).
At 95% coverage, you encounter about 1 unknown word in every 20. That is enough to learn new vocabulary from context — your brain can infer meaning from the surrounding words — without losing track of the overall story.
This is exactly why reading at the right CEFR level matters so much. A text calibrated to your level naturally falls in this zone.
What the CEFR levels actually mean for reading
The Common European Framework of Reference (CEFR) divides language ability into six levels. Here is what each level looks like in practice when it comes to reading:
You can understand familiar names, very simple sentences, and basic phrases. Think short messages, simple signs, or a few lines describing a person or place. Vocabulary: roughly 500-1,000 words.
You can read short, simple texts on familiar topics — personal letters, simple descriptions, menus, timetables. You understand the main point even if some details escape you. Vocabulary: roughly 1,000-2,000 words.
You can understand texts on everyday or job-related topics. You follow the main argument of a news article or a simple blog post, even if some expressions are unfamiliar. Vocabulary: roughly 2,000-4,000 words.
You can read articles and reports about contemporary problems. You understand most opinion pieces, reviews, and narrative texts. You occasionally need to re-read a complex paragraph. Vocabulary: roughly 4,000-6,000 words.
You can understand long, complex texts including literary works, specialist articles, and lengthy technical instructions. You catch implicit meaning and irony. Vocabulary: roughly 6,000-10,000 words.
You can read virtually anything — academic papers, literary fiction, legal documents, subtle humor. You read at near-native speed and rarely encounter unfamiliar vocabulary. Vocabulary: 10,000+ words.
How to find your level
If you are unsure where you stand, use this practical test:
- Pick a short text at the level you think you are — a paragraph or two is enough.
- Read it once without looking anything up. Do not translate, do not use a dictionary.
- Check your understanding:
- If you understood almost everything and encountered 1-3 new words → this is your level.
- If you understood the general idea but missed many details → go one level down.
- If it felt too easy and you learned nothing new → try one level up.
When in doubt, start lower than you think. Reading comfortably builds momentum, confidence, and habit — all of which matter more for long-term progress than pushing through difficult texts.
Why easier is better
There is a common instinct to read hard material because it feels more productive. The research says the opposite.
When texts are too difficult, learners spend most of their energy decoding individual words instead of processing meaning. Vocabulary acquisition drops because there is not enough context to infer new words. Motivation drops because the experience is frustrating. And reading speed drops, which means less total input per session.
Easier texts — ones where you already know most of the language — give your brain the space to notice patterns, absorb new words naturally, and build the automatic processing that fluency requires. The research behind this is detailed in what 74 studies found about extensive reading.
ToTo matches a new story to your CEFR level every day — in Spanish, Dutch, Italian, Romanian, Swedish, or English. Three minutes. Free.
