Free Readability Calculator
Score your manuscript with Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI — all computed instantly in your browser.
Your Text
Paste at least 10 words to see your scores.
Most bestselling fiction scores between grade 4 and 7 — clarity sells. Aim for Flesch 60+ for general audiences, or 70+ for children's and middle-grade books. Formulas use standard published coefficients; syllables are estimated heuristically.
Ready to publish? Design the full book now
Take your files straight into KDPage Studio. Design professional, print-ready covers, generate puzzle book interiors, and compile everything in minutes.
Frequently Asked Questions
What's a good Flesch Reading Ease score for a book?
Most bestselling fiction scores 60-80 (roughly 8th-9th grade level); children's and middle-grade books typically score 80 or higher.
Why do the five formulas give slightly different grade levels?
Each formula weighs sentence length, syllables, or character counts differently — treat them as a range rather than one precise number.
Is my text uploaded to a server?
No — all scoring happens locally in your browser using standard published formula coefficients.