Readability Scorer
Paste text and instantly see its reading grade level across five established formulas.
Results update as you type. Minimum ~100 words recommended for accurate results.
?? Research Basis & Sources
Who This Tool Is Designed For
Readability assessment benefits content creators, educators, healthcare communicators, and anyone writing for diverse audiences. According to the National Center for Education Statistics (NCES), a significant proportion of U.S. adults read at basic or below-basic literacy levels, as measured by the Program for the International Assessment of Adult Competencies (PIAAC). The CDC and NIH recommend health materials be written at or below a 6th-grade reading level to ensure broad comprehension. People with cognitive disabilities, learning disabilities, non-native language speakers, and older adults are disproportionately affected by complex text.
Formula Citations
- Flesch, R. (1948). "A new readability yardstick." Journal of Applied Psychology, 32(3), 221�233. � The original Flesch Reading Ease formula; 0�100 scale where higher scores indicate easier reading.
- Kincaid, J.P., Fishburne, R.P., Rogers, R.L. & Chissom, B.S. (1975). "Derivation of new readability formulas for Navy enlisted personnel." Research Branch Report 8-75, Naval Technical Training Command. � Recalibrated the Flesch formula to output U.S. school grade levels.
- Gunning, R. (1952). The Technique of Clear Writing. McGraw-Hill. � The Fog Index estimates years of formal education needed to understand text on first reading.
- Coleman, M. & Liau, T.L. (1975). "A computer readability formula designed for machine scoring." Journal of Applied Psychology, 60(2), 283�284. � Uses character counts rather than syllables for more reliable automated scoring.
- McLaughlin, G.H. (1969). "SMOG grading � a new readability formula." Journal of Reading, 12(8), 639�646. � Widely considered the gold standard for health literacy assessment by the U.S. Department of Health and Human Services.
- Smith, E.A. & Senter, R.J. (1967). "Automated Readability Index." AMRL-TR-66-220. Wright-Patterson Air Force Base. � Character-based formula originally designed for machine scoring of military technical manuals.
Disclaimer
Readability formulas provide statistical estimates based on surface-level text features (word length, sentence length, syllable count). They do not measure comprehension, coherence, or content accuracy. No formula can fully account for reader background knowledge, motivation, or the presence of cognitive or learning disabilities. These scores are best used as one input among several when evaluating text accessibility. This tool does not provide medical, educational, or legal advice.