Readability checker

Score English text with Flesch Reading Ease and Flesch–Kincaid grade level, plus sentence and word statistics.

Scored in this browser. The text never leaves your device.

Flesch Reading Ease and Flesch–Kincaid grade are English-only formulas — they do not apply to Japanese or other languages. Syllables are estimated by a vowel-group heuristic, so scores are approximate (±5 is normal). Up to 500,000 characters.

How to use

  1. Paste English text.
  2. Read the two scores and the difficulty band.
  3. Adjust the text and re-check.

What it supports

Syllables are estimated heuristically — the scores are approximations for English text only, not a definitive measure and not meaningful for other languages. Input up to 500,000 characters.

Related tools

Related guides