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Sentences are identified by terminal punctuation (. ! ?) followed by whitespace or end of text. Abbreviations (Dr., U.S.A.) and decimal numbers (3.14) must be excluded from sentence boundaries.
Avg sentence length = total_words / sentence_count; Readability correlates with sentence length variationAverage sentence length is a key input to readability formulas. Flesch-Kincaid uses avg sentence length + avg syllables per word. Ideal ranges: casual writing 15-20 words, academic 20-30 words.
Updated: July 2026
Analyze a 1000-word blog post for sentence length variation and readability.
→ Average: 18 words/sentence; Range: 5-35; Variation: good (Flesch score ~65)
Find sentences over 40 words that may be difficult to read.
→ Flags 3 sentences over 40 words with their line locations
Periods in abbreviations (Dr., Inc., U.S.), numbers (3.14), and URLs (example.com) are not sentence boundaries. Use heuristics: period + uppercase letter + space = likely sentence boundary.
Readability requires sentence length VARIATION, not uniformly short sentences. A mix of 8-25 word sentences reads better than all 12-word sentences. Monotonous length creates dull prose.
Measure sentence lengths and readability patterns in prose. Writers and editors can spot overly long sentences and balance pacing with instant statistics. It applies the sentence detection (Avg sentence length = total_words / sentence_count; Readability correlates with sentence length variation). For example: check blog post readability — Analyze a 1000-word blog post for sentence length variation and readability.