Em Dashes: What They Are & How to Use Them
Whether it be a proclivity for writing long, winding sentences or a staunch belief in using the Oxford comma, there are little choices every writer makes within the details of their writing that are specific only to them. It’s part of each writer’s unique style and voice, the small details that make up the way we tell our stories.
There’s not much room for personal choices within punctuation, but one thing I’ve noticed as an editor (and even simply as a reader) is that em dashes are something of a personal preference. Some love them, some never touch them; some use them sparingly, some use them a lot.
And hey, no judgement here. I like them, too—a lot.
Em dashes can be used in several contexts. They are a punctuation choice that contributes to style because of the emphasis they create and the often more informal tone they provide compared to the alternatives.
But before we can use them—or overuse them, as the case may be—it’s important to know exactly what em dashes are and how to properly use them within your writing.
Punctuation Guide: Em Dashes
Em Dashes—What They Are
Em dashes are a punctuation mark that can be used in place of commas, colons, and parentheses to set information apart or show a break in the sentence.
An em dash looks like a horizontal line (—). It is called an em dash because it is the same width as an M.
Em dashes are not the same thing as hyphens (-) or en dashes (–).
Typing two hyphens will create an em dash on Macs and in Microsoft Word. On a Mac, you can also use the Option + Shift + Hyphen buttons to create an em dash. Word users can also hit Alt + 0151.
The real power of em dashes is that they carry a certain stylistic impact that the other punctuation marks they replace lack. Em dashes tend to emphasize whatever they’re setting apart; however, they’re also generally seen as more informal. In sentences where em dashes could be used in place of another punctuation mark, there’s no general preference; one is not more correct than the other. Writers should think about how they want information to flow within a sentence, what they want to emphasize, and make the decision based on that.
Let’s take a look at where em dashes can be used.
Em Dashes in Place of Commas
You can use em dashes in place of commas that set off additional information. It’s important to remember that not every use of commas can be replaced with em dashes. Commas have their unique functions, and em dashes can only set off information.
Comma: The boy, who was only six, shouldn’t have been walking alone in the mall.
Em dash: The boy—who was only six—shouldn’t have been walking alone in the mall.
Both work, but notice how the em dashes emphasize the phrase “who was only six” in a way the commas don’t. It draws reader attention to that information more; it’s a more impactful delivery.
Em dashes can be useful in sentences where a lot of commas are already being used or when the information that is being set off has commas within it.
Comma: The girls’ favorite colors, red, blue, and purple, were splashed all over the walls.
Em dash: The girls’ favorite colors—red, blue, and purple—were splashed all over the walls.
Use of em dashes here enhances readability and decreases the chance of confusing the reader.
Em Dashes in Place of Colons
Use em dashes in place of colons at the end of sentences when you want to emphasize the information or make the presentation of that information feel less formal.
Colon: Only one thing hadn’t been returned to Nadia after the police caught the robbers: the ring her grandmother gave her.
Em dash: Only one thing hadn’t been returned to Nadia after the police caught the robbers—the ring her grandmother gave her.
Em Dashes in Place of Parentheses
Use em dashes instead of parentheses in the middle of a sentence or at the end of a sentence to show additional information, commentary, or interruptions.
Parentheses: There’s something about that painting (the one with the ship) that I just don’t like.
Em dash: There’s something about that painting—the one with the ship—that I just don’t like.
If you’re deciding between parentheses and em dashes, remember that em dashes always emphasize whatever they’re setting apart and parentheses more subtly deliver whatever information is within them.
Also remember that only one em dash is necessary if what it sets off come at the end of the sentence, unlike parentheses.
Parentheses: Don’t give her any mashed potatoes (she doesn’t like them).
Em dash: Don’t give her any mashed potatoes—she doesn’t like them.
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Em dashes for Interruptions
Em dashes are very versatile. In addition to being able to replace commas, colons, and parentheses, em dashes can be used to show interruption in thought, dialogue, and sentence structure.
When used to show an interruption that cuts the dialogue off, the em dashes go inside the quotations.
“You can’t just take that—”
“I can do what I want.”
“—when they’re not looking.”
Notice that when the dialogue picks up again, there’s an em dash used at the beginning of the sentence and the first letter is lowercase.
When the interruption belongs to the overall sentence and not the dialogue, the em dashes come outside the quotations.
“I’ve had a really long day so”—she grabbed her pajamas off her bed—“I think I’ll just stay in tonight.”
Em Dashes For Missing Words:
Em dashes can be used to show missing words.
“Mr. J——, you’re late on your electric bill.”
If a whole word is missing, use two or three em dashes to show that.
“She goes to ——— Elementary School.”
Remain consistent with your choice of two or three throughout your document. Remember to use normal surrounding punctation, too.
Em Dash Spacing
Most style guides recommend using em dashes with no space on either side of them.
Do you like that bow—the red one—for our wreath?
AP Style uses one space on either side of em dashes. You’ll see this in most newspapers and magazines.
Do you like that bow — the red one — for our wreath?
In UK English
You’ll recall I pointed out that em dashes are not the same as hyphens (-) or en dashes (–). I do want to note that in UK English, it’s standard to use en dashes in place of em dashes with spaces on either side of the dashes. Oxford Style prefers em dashes with no space (like Chicago Manual of Style), but it’s not a commonly followed rule. UK English does, however, use em dashes for breaks in dialogue.
The dog – a white poodle – was covered in mud from the walk.
Em dashes are useful little things. Whether you like to sprinkle them throughout your writing or prefer to minimize your use, it’s important to understand their function and how you can best make use of them within your own writing. Remember, em dashes are a fantastic way to emphasize information and add a little drama to your delivery. It’s impactful and a little less formal, often more conversational.
Finding a great editor is important for ensuring the quality of your work before publishing. Want to make sure you’re not using em dashes or other punctuation wrong?
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