Readability Score
Scores English text with Flesch–Kincaid and friends, and estimates reading time in both languages.
Measures sentence length, word length and reading time, and computes the six standard readability indices for English. For Korean it deliberately prints no grade level, because every one of those formulas was fitted to English and Hangul makes them meaningless.
Text
Measured
sentences
6
English words
36
어절 (spaced chunks)
36
한글 syllables
0
words per sentence
6
syllables per word
2.33
reading time
9 sec
read aloud
15 sec
Readability indices
| Index | Score | Reading |
|---|---|---|
| Flesch Reading Ease | 3.3 | Very difficult — postgraduate |
| Flesch–Kincaid Grade | 14.3 | US school grade needed to read it |
| Gunning Fog | 16.8 | Years of formal education. Counts 3+ syllable words as complex, including proper nouns. |
| SMOG | 11.5 | Fitted on 30-sentence samples — unreliable on a text this short |
| Coleman–Liau | 19.8 | Grade level from letters per word, no syllable counting |
| Automated Readability | 14 | Grade level from characters per word |
Longest sentence
The quarterly report describes a substantial reorganisation of the distribution network.
11 words. Sentence length is the single lever that moves every one of these indices, and it works in Korean too.
How to use it
Paste a few hundred words
The indices need at least ten words to say anything, and SMOG was fitted on thirty-sentence samples — below that it is flagged as unreliable rather than quietly wrong.
Read the measured figures first
Sentences, words per sentence, 어절 count and reading time transfer across languages. The indices do not.
Act on the longest sentence
Sentence length is the single lever that moves every one of these indices, and it is the one that works in Korean too. The longest sentence in the text is shown in full.
Common questions
Why is there no grade level for Korean?
Flesch, Flesch–Kincaid, SMOG and Gunning Fog all count syllables per word, and Hangul is syllabic — every Korean word counts as polysyllabic, so any Korean paragraph scores as postgraduate English. The number would be meaningless, so it is not printed.
How is the syllable count worked out?
By rule: vowel groups, minus a silent final e, with the -le exception. It is off by one on words like rhythm, and across a few hundred words that averages out — which is why there is no per-word syllable view here.
Which index should I trust?
None of them alone. They agree on direction and disagree on the number, and each was fitted on a different corpus — Flesch on schoolbooks, Flesch–Kincaid on US Navy training manuals, SMOG on health materials. Use them to compare two drafts, not to certify one.
Feed it from
Word & Character Counter
Counts characters with and without spaces, words, lines, paragraphs and UTF-8 bytes.
Korean Spelling Helper
Flags spacing, spelling and particle mistakes in Korean text and explains the rule behind each one.
Case Converter
Converts between UPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case and CONSTANT_CASE.
Text Diff
Compares two texts side by side or inline, at line, word or character granularity.
Next
These accept what this tool produces, so the result can go straight in.
Korean Spelling Helper
Flags spacing, spelling and particle mistakes in Korean text and explains the rule behind each one.
Word & Character Counter
Counts characters with and without spaces, words, lines, paragraphs and UTF-8 bytes.
Word Frequency
Counts how often each word or n-gram appears, with Korean-aware tokenising and a stopword list.
Currency Converter
Converts between about thirty currencies at the ECB’s daily reference rates, crossed through the euro, or at a rate you type in.
Date Difference
Counts days, weeks, months and years between two dates, with a D-day view and business-day option.
HTTP Request Builder
Composes and sends a GET/POST/PUT/PATCH/DELETE/HEAD request with custom headers and a body, and shows the status, headers, body and timing — without ever forwarding cookies or Authorization.