Semicolon vs colon: what each one does, a quick way to choose, and examples
A semicolon joins two equal ideas; a colon points forward to something that explains or expands. If what comes next is a payoff, an example or a list, use a colon. If it is a second, equally weighted thought, use a semicolon. Here are examples, a quick test and the mistakes a copy editor will catch.
What a semicolon does
1. Joins two closely related sentences without a joining word like and, but, or so:
- The draft is finished; the edit starts Monday.
- Most readers skim the introduction; few skip the first chapter.
It is also one of the fixes for a comma splice, along with a period or a comma plus a joining word.
2. Separates list items that already contain commas, so the reader can see where each item ends:
- The book tour stops in Austin, Texas; Denver, Colorado; and Portland, Oregon.
What a colon does
The Chicago Manual of Style's blog, CMOS Shop Talk, describes a colon as introducing an element or a series of elements illustrating or amplifying what has preceded it. In practice:
- A list: Every chapter needs three things: a story, a point, and a takeaway.
- An explanation or payoff: The draft has one problem: the ending.
- A quotation or question: My editor asked the question I had avoided: who is this book for?
A colon can also join two complete sentences. The same Chicago source notes that between independent clauses a colon works much like a semicolon, but it puts the emphasis on the clause that follows. Use it when the second sentence pays off the first: "The test was simple: if a story did not serve the reader, it went."
A quick way to choose
| Ask | If yes | Example |
|---|---|---|
| Is what follows a list, an example or an explanation of what came before? | Colon | She had one goal: finish the draft by June. |
| Are there two equal, related sentences with no joining word? | Semicolon | She finished in May; he finished in July. |
| Do the list items already have commas inside them? | Semicolons between items | Chapters on hiring, onboarding, and pay; firing; and culture. |
| Would a period work just as well? | Use the period | She finished in May. He finished in July. |
Examples written by Scribe Media.
Common mistakes
- A colon after an incomplete sentence. "The three steps are: plan, draft, and revise" splits a sentence that did not need a break. Write "The three steps are plan, draft, and revise," or "There are three steps: plan, draft, and revise."
- A semicolon before a fragment. "I finished the draft; finally." The part after a semicolon should be able to stand alone. Use a comma or a period instead.
- Semicolons where commas will do. In a simple list without internal commas, use commas.
- Too many of either. In nonfiction, a page full of semicolons can feel heavy. A period is often the clearest choice.
A copy editor will make these consistent across your book; see what a copy editor does. For other punctuation and usage choices, see the Oxford comma and that vs which.
Start here: search one chapter for semicolons. For each, ask whether a period would work just as well. If it would, consider using the period.
Common questions
What is the difference between a semicolon and a colon?
A semicolon joins two closely related, equally weighted sentences: "The draft is done; the edit starts Monday." A colon introduces something that explains or expands on what came before: "The draft has one problem: the ending."
When should I use a semicolon?
In two main places: between two complete sentences that are closely related, without a joining word like and or but; and between items in a list when the items already contain commas.
When should I use a colon?
After a complete sentence, to introduce a list, an example, an explanation or a quotation. What comes after the colon answers or expands on what came before it.
Can a colon join two sentences?
Yes. Chicago says that between independent clauses a colon works much like a semicolon, but it puts the emphasis on the clause that follows. Use it when the second sentence explains or pays off the first.
Sources: CMOS Shop Talk (The Chicago Manual of Style's blog), Chicago Style Workout 26: Colons (a colon introduces elements illustrating or amplifying what precedes it; between independent clauses it works like a semicolon but emphasizes what follows; CMOS 18, 6.65 to 6.71), read November 1, 2026. Examples, the test and the mistakes list were written by Scribe Media. Published by Scribe Media.