Em Dash vs En Dash vs Hyphen: The Complete Guide

A Quick Tour of All Three Marks

Three horizontal strokes share a family resemblance but do completely different jobs on the page: the hyphen (-), the en dash (–), and the em dash (—). Mixing them up is probably the single most common slip in punctuation, which is a shame because the rules are short and surprisingly easy once you see them laid out.

The odd names "em" and "en" are a gift from the print world. In traditional typography, an em dash runs the width of a capital M in whatever typeface you're setting, and an en dash matches the width of a capital N. The hyphen is the runt of the litter.

Working With the Hyphen (-)

The hyphen shows up everywhere, partly because it's the only one of the three with its own key on the keyboard. Think of it as glue: its job is to stick words and word parts together. For the deeper dive, check our complete hyphenation rules guide.

Stacked Modifiers Before a Noun

When two or more words team up to describe a noun that follows, you usually hyphenate them:

• a long-term investment
• a state-of-the-art lab
• a five-minute walk
• a sun-soaked patio

Flip the sentence so the modifier sits after the noun, and the hyphen usually disappears:

• The investment is long term.
• The lab is state of the art.

Spelled-Out Numbers and Fractions

• twenty-one through ninety-nine
• three-quarters of the class
• one-fifth of the budget

Prefixes That Need Help

Certain prefixes ask for a hyphen, especially when they bump into a proper noun, a numeral, or a spelling that would read strangely without one:

• anti-American
• self-aware
• ex-partner
• re-press (press again) vs. repress (hold back)

Heading Off Confusion

A well-placed hyphen stops readers from stumbling:

• re-count (count again) vs. recount (tell a story)
• man-eating shark (a shark that eats people) vs. man eating shark (a man having sashimi)

Working With the En Dash (–)

The en dash sits in the middle of the sibling lineup, a touch longer than a hyphen. It has two main gigs: marking ranges and linking things that go together.

Ranges

Use an en dash in place of the words "to" or "through" whenever you're expressing a span—pages, years, times, anything numeric or sequential:

• chapters 3–7
• the 1914–1918 war
• Tuesday–Thursday
• 8:30–10:00
• the Tokyo–Osaka line

One trap worth remembering: don't mix the en dash with "from" or "between." Once you've written "from," finish the phrase with "to"; once you've written "between," finish with "and":

Correct: from 2015 to 2020 / between 2015 and 2020

Incorrect: from 2015–2020 / between 2015–2020

Links Between Equal Items

An en dash also joins two things of roughly equal weight, and it's especially handy when one of those things is itself made of more than one word:

• the mind–body problem
• the Chicago–Miami route
• the author–editor dynamic
• the Pulitzer Prize–winning novelist

Scores and Vote Tallies

• Brazil won 2–0.
• The motion carried 71–29.

Working With the Em Dash (—)

The em dash is the longest of the three and by far the most flexible. It's one of the most expressive punctuation marks English has, and depending on where it lands it can stand in for commas, parentheses, colons, or semicolons.

Setting Off an Aside

A matched pair of em dashes drops an aside right into the middle of a sentence, doing roughly the same job as parentheses or commas, just with more volume:

• The contract—after six rounds of edits—was finally signed.
• My cousin—the chef, not the pilot—is hosting dinner.

A Speaker Being Cut Off

In dialogue, an em dash signals a sharp interruption. Compare that with the ellipsis, which suggests a voice fading away:

"Wait, I haven't finished telling you—"
"You don't need to. I was there."

Launching a List or an Explanation

An em dash can kick off a list or an explanatory phrase, much like a colon:

Good writing rests on three things—rhythm, restraint, and revision.

Stretching the Pause for Effect

She turned over the card and saw only one word—forgiven.

Pulling an Idea Back Together

Curiosity, stamina, and grit—these traits carried her through the year.

Marking an Attribution

"Not all those who wander are lost."
—J.R.R. Tolkien

Putting Them Side by Side

Spaces Around Each Mark

Hyphen

Keep it tight. Write short-term, never "short - term." The hyphen lives pressed against the letters on either side.

En Dash

For ranges, the en dash usually snuggles up to the numbers on both sides: 10–20, not "10 – 20." British publishers sometimes add spaces around it and use it where Americans would reach for an em dash.

Em Dash

This is the point where style guides split into camps:

• No spaces (standard American): The flight—delayed three hours—finally left.
• Spaces (some British publications): The flight — delayed three hours — finally left.
• Spaced en dash (another British option): The flight – delayed three hours – finally left.

Chicago Manual of Style and the bulk of American publishers set em dashes closed up against the surrounding text. Several British papers, The Guardian among them, prefer a spaced en dash instead.

Typing Each Dash on Any Device

Most word processors do some of the work for you: type two hyphens in a row (--) and applications like Microsoft Word and Google Docs will quietly swap them for an em dash. The autocorrect is usually on by default, which is why you rarely have to reach for the keyboard shortcut.

Where the Major Style Guides Stand

Chicago Manual of Style

Chicago draws crisp lines between all three marks. It sets the em dash closed (no spaces), uses the en dash for ranges and certain compound modifiers, and keeps the hyphen for word-joining duties. It's the most detailed guide on this subject you'll find.

AP Stylebook

AP takes a looser approach. It puts spaces on both sides of the em dash and mostly skips the en dash entirely, letting hyphens cover ranges and compounds. That keeps things simple at the expense of a little typographic precision.

British Style (Guardian, Oxford)

A spaced en dash often shows up in British newspapers and magazines where an American editor would drop in an em dash. Using the en dash for ranges is the default in British English.

The Old-School Double Hyphen (--)

In the typewriter era, and later in plain-text emails and code comments, two hyphens side by side stood in for an em dash. You'll still see this shorthand in programming contexts, quick messages, and anywhere special characters are awkward.

Readers understand it, but polished prose calls for the real em dash (—). The good news is that most modern writing tools will upgrade -- to — on the fly while you type.

Mistakes People Make and Quick Fixes

Slip 1: Hyphens Where Ranges Need En Dashes

Incorrect: chapters 3-7

Correct: chapters 3–7

Slip 2: A Hyphen or En Dash Standing in for an Em Dash

Incorrect: The outcome - to everyone's relief - was fair.

Correct: The outcome—to everyone's relief—was fair.

Slip 3: Gaps Around Hyphens in Compounds

Incorrect: a long - term lease

Correct: a long-term lease

Slip 4: Sprinkling Em Dashes Too Freely

Em dashes are powerful, but pile up three or four in a single paragraph and the prose starts to feel jittery. Cap yourself at one or two per paragraph, and ask whether a comma, a pair of parentheses, or a colon might do the job more quietly.

Slip 5: Pairing "From" or "Between" With an En Dash

Incorrect: from 8:00–10:00

Correct: from 8:00 to 10:00 or 8:00–10:00

The Short Version Worth Remembering

• The em dash (—) interrupts, sets off asides, introduces lists, and adds emphasis.
• The en dash (–) marks ranges and connections: scores, routes, dates, page spans.
• The hyphen (-) glues words and word parts: compound modifiers, prefixes, spelled-out numbers.
• No spaces ever hug a hyphen. En dash spacing follows the context. Em dash spacing follows the style guide you're writing for.
• Skip "from X–Y" and "between X–Y"—pair them with "to" and "and" instead.
• Let the em dash earn its keep by using it sparingly.

Want more on related topics? Head over to our pieces on hyphenation rules, ellipsis usage, and the complete guide to punctuation marks.