Text Readability Calculator

Analyze English text and calculate Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, and SMOG scores.

1.1M uses Updated · 2026-05-25 Runs locally · zero upload
AD

How to Use the Text Readability Calculator

Paste English paragraphs, articles, or instructions into the text area. The calculator detects words, sentence boundaries, and estimated syllables automatically.

The main result is Flesch Reading Ease, with Flesch-Kincaid grade, Gunning Fog, SMOG, and word/sentence/syllable counts shown below. Use copy result for editing notes.

Formula and Method - Text Readability Calculator

Flesch Reading Ease = 206.835 - 1.015×(words/sentences) - 84.6×(syllables/words)

Readability formulas estimate difficulty from sentence length and word syllable complexity. Longer sentences and more multisyllabic words generally raise grade-level scores and lower reading ease.

Use Cases for the Text Readability Calculator

  • Checking English web copy, instructions, or health education material.
  • Comparing whether an edited version is easier to read.
  • Matching language complexity to public, student, or professional audiences.

Frequently asked questions about Text Readability Calculator

Does it support Chinese readability?

No. The current formulas and syllable rules target English text.

Are syllable counts exact?

No. They are rule-based estimates suitable for quick comparison.

Which score matters most?

There is no single best score; use reading ease for public copy and grade scores for education-oriented review.