Using Dashes: En Dash, Em Dash, 2 Em Dash, or 3 Em Dash?

Everything you’ve ever wanted to know about dashes!

A young man dashes down a path surrounded by trees.
Don't dash to use dashes! Dashes can be
complicated, so read these helpful tips
before using them in your writing.

If you’re confused about the various types of dashes and when to use them, you’re not alone. Figuring out whether to use an en dash, em dash, 2 em dashes, or even (gasp!) 3 em dashes can be confusing. Let’s take a look at the different types of dashes and when to use these little punctuation marks.

En dash 

In ranges

The en dash (–) gets its name because it’s the same width as the letter N. It is generally used in place of “to” for connecting numbers in ranges, although it can also connect words (in which case, it means “through”). For example,

David Foster Wallace (1962–2008)

May–October

25–45°C

The Packers won 21–14.

Note that an en dash should not be used for negative numbers, and that there should be no spaces before or after it. It should also not be used when the number or word is preceded by from or between (from…to, or between…and). So,  

The park is open from May to October.                       The temperature is 32–45°F.

Or…                                                                                        Or…

The park is open May–October.                                  The temperature is between 32 and 45°F.               

But not…                                                                                But not…

The park is open from May–October.                          The temperature is between 32–45°F.

Instead of a hyphen

The en dash can be used when joining compound modifiers where at least one of the words is an open compound (meaning not hyphenated) or is already hyphenated. For example,

New York–Tel Aviv connection

Mother-of-the-bride–approved dresses

Post–October Revolution politics

Creating an en dash

Creating an en dash can be done by either:

  • [ctrl] and the minus sign on the numpad or
  • [alt] 0150 (on the numpad)

Em dash

The em dash (— or -- [on an old-fashioned typewriter]) is the most commonly used type of dash and is often simply referred to as a dash. It gets its name—no big surprise here—because it’s the width of an M. This punctuation mark is used primarily in informal writing in place of a comma, colon, semicolon, or parentheses to provide emphasis.

Set off parenthetical elements/explain

When I was driving—well, asleep at the wheel—I got into an accident.

The em dash in this example could be substituted with parentheses, but not a comma because commas cannot be used to set off parenthetical expressions when there is internal punctuation (commas inside the expressions), as can be seen in the following example.

When I was driving, well, asleep at the wheel, we got into an accident.

Sudden turn in thought/break in dialogue

“Mary, How could—Why would you do such a thing?”

“Can I finish my—,” the child pleaded.

“No! Get over here right now,” his mother shouted.

Unknown values in a table

An em dash can be used in place of an unknown value in a table.

Time (h)

Volume (mL)

24

12

48

8

72

 Creating an em dash

Creating an em dash can be done by either:

  • [ctrl] [alt] and the minus sign on the numbers pad or
  • [alt] 0151 (on the numpad)

2 em dash

The 2 em dash can be used to indicate missing letters in a word, either because material is missing or illegible, or to conceal a name. For example,

Mr. H—— and Mr. S—— entered into a legal agreement.

3 em dashes

These are used in bibliographies when the author’s name is repeated.

———. Adventures in Fancy. New York: Labadie & Sons. 2010.

Overall, dashes—especially en and em dashes—are useful tools writers should master. If you’re wondering whether you’re using them correctly or would like someone to review your documents, our academic editors are available 24/7 to help you! To learn more about the correct use of dashes and other punctuation marks, check out GrammarCamp, a proven grammar training course.

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