Life & Health Β· π Global
English Reading Level & CSAT Mapping
Flesch-Kincaid, SMOG readability with CSAT grade, TOEIC, CEFR mapping.
About this tool
English Readability Analyzer (readlvl) runs five classic readability formulas β Flesch-Kincaid Grade, SMOG, Gunning Fog, Coleman-Liau, and Dale-Chall β on any English passage, averages them, and maps the result to Korean CSAT (μλ₯) grades 1β9, TOEIC RC bands (100β495), CEFR (A1βC2), and Lexile range. Useful for English-academy teachers, CSAT/internal exam authors, and self-learners who want to gauge a passage at a glance; long passages get a paragraph-by-paragraph breakdown. The CSAT mapping is built from the past five years of official Korean CSAT English passages run through the same formulas. All analysis runs in the browser; passages never leave your device.
Use cases
Scenario 1
CSAT mock-exam passage check
Run an academy-authored CSAT mock passage and check its 1β9 grade mapping, then adjust difficulty distribution.
Scenario 2
English academy placement passage
Validate a new-student placement passage by CEFR (A1βC2) for clean level sorting.
Scenario 3
TOEIC learner passage curation
For a 700-RC target, curate passages mapped to the 600β750 band as daily study material.
Scenario 4
Paragraph-level breakdown
For a long academic piece where the intro is B1 but the body is C1, see the per-paragraph breakdown to plan study effort.
Scenario 5
CSAT vs TOEIC vs CEFR side-by-side
Map one passage to CSAT grade, TOEIC RC, CEFR, and Lexile simultaneously to anchor study goals.
Features
- 5 readability formulas in parallel (FK / SMOG / Gunning Fog / Coleman-Liau / Dale-Chall)
- Korean CSAT 1β9 grade mapping (past-5-year-based)
- TOEIC RC 100β495 band estimate
- CEFR A1βC2 + Lexile range
- Per-paragraph breakdown for long passages
- In-browser only β passages never leave your device
- Result PNG card + bilingual KO/EN UI
Frequently asked
- Q. Five formulas disagree β which one wins?
- A. The average is most stable. Gunning Fog/SMOG suit academic/technical, while Flesch-Kincaid is better for general prose. The tool auto-detects type and surfaces a recommendation.
- Q. Is the CSAT mapping official?
- A. No β it is an unofficial mapping derived by running the past 5 years of CSAT English passages through these same formulas and bucketing average FK grade into 1β9.
- Q. Are the TOEIC and CEFR mappings official?
- A. Not officially β the tool reverse-maps from readability to estimate the band. ETS / Council of Europe official mappings are score-based and differ.
- Q. Why are short passages unstable?
- A. Readability formulas stabilize at 100+ words. Under 30 words, a single long word skews the score β feed at least 1β2 paragraphs.
- Q. Are passages stored?
- A. No β all analysis runs locally; passages never leave the browser.
Sources / references
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How we run it / disclaimer
This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.