Paragraph length: how long should a paragraph be?

There is no correct number of sentences for a paragraph. Teachers who say “five sentences” are giving a training rule for a particular kind of essay. In real writing, paragraph length follows two things: the idea the paragraph carries and the screen or page it will be read on.

One idea per paragraph

A paragraph break tells the reader: this thought is complete, a new one starts here. If a paragraph holds two ideas, the reader loses that signal. If one idea is spread across three paragraphs, the breaks suggest changes that aren’t there.

A useful test: can you sum up the paragraph in one short sentence? If you need “and also” to do it, you probably have two paragraphs.

Before: The library will close for renovation from June to August. During that time, members can borrow books from the Elm Street branch. The renovation will add a children’s room and new study desks, and the café will reopen with longer hours.

41 words · 3 sentences · grade 6.4

After: The library will close for renovation from June to August. During that time, members can borrow books from the Elm Street branch.

22 words · 2 sentences · grade 5.3

The second version stops where the practical information ends. The details of the renovation belong in a paragraph of their own, where readers who care can find them.

On screen versus in print

The same paragraph looks longer on a screen than on paper, and much longer on a phone.

In print, a page is wide and the reader can see it all at once. Paragraphs of five to eight sentences are common in books and long-form journalism, and they read comfortably.

On a desktop screen, readers scan more than they read. Long blocks of text get skipped. Paragraphs of two to four sentences tend to work better for web pages, help articles, and email.

On a phone, a narrow column turns a modest paragraph into a tall wall of text. A 70-word paragraph can fill most of the screen. For text that will mostly be read on phones, shorter paragraphs make it easier for the reader to keep their place as they scroll.

None of this means you should break paragraphs at random to make text look lighter. A paragraph break still has to mark a real change of thought. If a paragraph is too long for the screen, the fix is usually to tighten the sentences or to find the second idea hiding inside it.

Single-sentence paragraphs

A one-sentence paragraph is not a mistake. Used sparingly, it gives a point emphasis that no other device can. It stands alone, so the reader notices it.

Used constantly, it does the opposite. When every paragraph is one sentence, nothing stands out, and the text reads like a list of slogans. Many web articles and social posts fall into this habit.

A reasonable approach: let most paragraphs carry a full idea in two or more sentences, and save the single-sentence paragraph for the one point you most want remembered.

Start with the point

The first sentence of a paragraph does the most work. Many readers on screen read only the first line of each paragraph before deciding whether to read on. If that sentence states the paragraph’s point, even a skimming reader gets the gist. Our guide to putting the main point first covers this in more detail.

Practical checks

• Look at the shape. Zoom out or step back from the screen. Any paragraph that looks like a solid block is a candidate for a split.
• Read the first sentences only. If they make a coherent summary, your paragraphs are organized well.
• Check on a phone. If the text will be read on mobile, preview it there. A paragraph that looks fine on a laptop can fill the whole screen.
• Count. Paste a paragraph into the word counter. If paragraphs on a web page regularly run well over 100 words, look for places to split.

Tip: When you split a long paragraph, check that the new second paragraph has its own opening sentence that states its point. A split in the middle of an argument just moves the problem.