Text Analyzerunknown word ratio calculator

Unknown Word Ratio Calculator

Paste a passage and estimate how much of it may sit above your current reading level before you commit to the book or build the deck.

FreeInstant resultNo upload needed

Estimate unknown-word ratio against your current reading level.

Translate raw difficulty into reading-fit language.

Use the result before you turn a hard book into an even heavier deck.

Text analyzer panel

Paste text and watch the estimate update immediately.

Live analysis

Your current reading levelChoose the level that best matches what you can normally read without heavy dictionary dependence.Paste English textUse a paragraph from the actual book, article, or chapter you want to judge.

B1 reader estimate: about 40.0% of this sample may sit above your current vocabulary comfort zone.

Unknown-word ratio

40.0%

Estimated words above B1.

Likely known coverage

60.0%

Higher known coverage usually makes sustained reading easier.

Estimated text level

Low confidence based on the current sample.

Reading fit

Likely too hard

Heuristic fit based on vocabulary gap rather than official assessment.

Takeaways

This likely pushes too much decoding into every page. Consider an easier text, a shorter excerpt, or stricter extraction filters.

Because the sample is short, treat the percentage as directional rather than exact.

Potentially difficult signal words include justify, preliminary.

Matched signals

justifypreliminary

How to interpret this tool

A book can look attractive in the abstract and still be wrong for your current level because the unknown-word ratio is too high. That is what kills reading flow first.

This tool compares the sample against your current CEFR level and estimates whether the text is readable, stretchable, or probably too expensive for sustained reading.

Usage notes

Treat short samples as directional only. The tool becomes more useful when the text reflects the real body of the book.

If vocabulary looks manageable but the text still feels hard, syntax or topic familiarity may be doing the damage.

Use the result to compare texts against each other, not to pretend the score is an official assessment.

FAQ

Is this percentage exact?

No. It is a planning heuristic. The point is to estimate whether the passage looks readable enough to preserve momentum, not to classify every word perfectly.

What is a safe unknown-word ratio for extensive reading?

Many readers feel comfortable when the unknown share stays very low. Once it rises noticeably, reading starts to feel more like decoding than contact with the language.