Advanced Text Statistics (Reading Time, Keyword Density)

Paste any text and get a deep statistical breakdown: reading time at average speeds, syllable count, sentence count, Flesch reading ease score (higher = easier), Flesch-Kincaid grade level, automated readability index (ARI), keyword density top 10, and most-common stopword-filtered words. Useful for content editors, SEO writers, and instructors checking that text matches a target audience.

How to use the Advanced Text Statistics (Reading Time, Keyword Density)

Paste or type text. Stats update as you type. Reading-time estimates use 200/250 WPM (average / fast reader). Flesch reading ease maps 0-100 to difficulty: 90+ very easy, 60-70 plain English, 30-50 difficult, <30 very difficult. Flesch-Kincaid grade level maps to a US school grade (Grade 8 = average adult).

About Advanced Text Statistics (Reading Time, Keyword Density)

Readability metrics quantify how hard text is to read. The most-cited are the Flesch family: Flesch Reading Ease (developed 1948) and Flesch-Kincaid Grade Level (developed 1975 for US Navy training manuals). Both use sentence length and syllable count as proxies for cognitive load. They’re imperfect — they don’t see word familiarity, idiom, or technical vocabulary — but they correlate well enough with reader perception to be useful targets.

SEO writers aim for Grade 8 or below for general audiences. Academic writing typically runs Grade 12-16. Legal text runs Grade 16+. Knowing where your text falls and rewriting to lower it (shorter sentences, simpler words) makes content more accessible.

Keyword density measures how often each non-stopword appears, normalized to total words. SEO best practice is 1-2% for your target keyword — above 3% looks spammy to modern search engines.

Common use cases

  • SEO content checks — confirm keyword density and reading level for ranking content.
  • Editorial review — ensure consumer copy reads at an appropriate grade level.
  • Education / curriculum design — match text complexity to student grade level.
  • Accessibility audits — high reading-grade text is harder for non-native speakers and those with cognitive differences.

Frequently asked questions

How accurate is the syllable counter?
Vowel-cluster heuristics are ~85% accurate for English. Specialised terms and proper nouns can throw it off; for academic / medical text, professional readability tools use phonological dictionaries for ~99% accuracy.

What's a good Flesch score?
Plain English target is 60-70 (8th-9th grade). Below 30 is very difficult. Above 80 is conversational. For SEO, aim for 60-80 unless you're writing for specialists.

Why are some stopwords missing from the density list?
The stopword filter removes ~150 common English words (the, a, of, and, etc.) so the density list shows substantive vocabulary. Toggle the option if you want raw counts.