Is my text uploaded to a server?

No. All readability analysis runs locally in your browser using JavaScript. Your text never leaves your device.

What readability score should I aim for?

For general web content, aim for a Flesch Reading Ease score of 60–70 (US 8th grade). For technical content or professional audiences, 40–60 is acceptable. For children's content or simple instructions, aim for 80+.

How is the Flesch score calculated?

Flesch Reading Ease = 206.835 − (1.015 × average words per sentence) − (84.6 × average syllables per word). Higher scores mean easier text.

What is the Gunning Fog Index?

The Gunning Fog Index estimates the years of education needed to understand the text on first reading. A score of 12 means a high school graduate can understand it. Most online content should target 8–12.

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Readability Score Checker

Analyse text readability using Flesch-Kincaid Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, SMOG and other scoring models. Free, browser-based.

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Readability Scoring Models

Readability formulas estimate how easy a text is to understand based on word and sentence complexity. They are widely used in education, publishing and SEO to ensure content is appropriate for the target audience.

Score Interpretation

Flesch Score	Difficulty	Typical Audience
90–100	Very Easy	5th grade, age 10
70–90	Easy	6th grade, age 11
60–70	Standard	7th–8th grade
50–60	Fairly Difficult	10th–12th grade
30–50	Difficult	College level
0–30	Very Difficult	University graduate

SEO and Readability

Google prioritises content that satisfies user intent — readable, clear writing keeps users on-page longer and reduces bounce rate. Aim for a Flesch score of 60–70 for general web content. Use shorter sentences (under 20 words) and simpler vocabulary. Most blog content targets a US 8th grade reading level.

Readability Score Checker

Readability Scoring Models

Score Interpretation

SEO and Readability

Frequently Asked Questions