Runs in your browser · Last updated 4 September 2026
Flesch-Kincaid Checker
Flesch Reading Ease and Flesch–Kincaid grade level from words, sentences, and syllables. Browser only.
Flesch Reading Ease and Flesch–Kincaid Grade Level use word, sentence, and syllable counts in this tab. Syllables are a vowel-group estimate — not a dictionary lookup. Ease is shown 0–100; grade 0–20. This sample is off-scale, so the display is capped.
Reading ease
100.0
Grade level
0.0
Band
Very easy (5th grade)
Words
16
Sentences
3
Syllables
16
How to use this tool
- Paste English prose.
- Read ease (higher is easier) and grade level.
- Shorten sentences or swap long words if you want a higher ease score.
Worked example
“The cat sat on the mat. The dog ran to the park.” is short words and short sentences — high ease, low grade. Swap in “notwithstanding” and the grade jumps.
Frequently asked questions
- Which formulas?
- Flesch Reading Ease: 206.835 − 1.015×(words/sentences) − 84.6×(syllables/words). Flesch–Kincaid Grade Level: 0.39×(words/sentences) + 11.8×(syllables/words) − 15.59.
- How are syllables counted?
- Vowel groups in each word, minus a silent trailing e (except -le). It is an estimate. “Another” can be off by one.
- What score should I want?
- 60–70 is plain English for a general site. Legal and medical copy often lands lower and that can be correct.
- Does this use an LLM?
- No. Counts only. The text never leaves the tab.
- Other languages?
- The formulas were built for English.