Glossary
Sentence Length
The number of words in a single sentence, used as a readability indicator.
Definition
Sentence length refers to the number of words contained in a single sentence. It is a key variable in most readability formulas, including the Flesch Reading Ease score. Shorter sentences are generally easier to read and comprehend, while longer sentences increase cognitive load.
Why It Matters
Sentence length directly impacts comprehension and reading experience. For web content especially, where readers are often scanning, shorter sentences improve clarity and engagement. Varied sentence length creates rhythm and keeps writing dynamic.
Examples
Short (easy to read)'Write clearly. Be direct. Use simple words.' — 3–5 words each
Medium (ideal for web)'Sentence length directly affects how easy your content is to read.' — 14 words
Long (harder to read)A sentence with multiple subordinate clauses and compound ideas strung together can quickly overwhelm readers — 30+ words
Common Mistakes
Averaging 20+ words per sentence throughout an entire article.
Chopping all sentences to under 10 words — extreme brevity disrupts flow.
Not varying sentence length.
Confusing complex vocabulary with long sentences.