There’s a moment every writer knows. You’re mid-sentence, and suddenly you hit a pause — a break — a connection between two ideas, and you hover over the keyboard wondering: is that a hyphen? An en dash? An em dash? You pick one, slightly uncertain, move on, and quietly hope no one notices.
The uncomfortable truth is that these three marks — the hyphen (-), the en dash (–), and the em dash (—) — are not interchangeable. Not even close. Using the wrong one isn’t a minor style quirk; it’s a punctuation error, and to an editor or seasoned reader, it stands out in the same way a misplaced comma or a rogue apostrophe does.
And yet, the confusion is completely understandable. They look almost identical at a glance, their functions occasionally overlap, and style guides don’t always agree on the finer points.
This guide exists to fix that, completely and once and for all. We’re going to walk through each mark in detail, explain exactly what it does, show you where it belongs, and point out the mistakes that trip writers up most often. By the time you’re done, you’ll be reaching for the right dash every single time — confidently, without second-guessing yourself.
Before we get into the rules, it’s worth taking a moment to understand why this particular area of punctuation causes so much trouble.
Part of it is visual. On most standard fonts, the hyphen, en dash, and em dash look genuinely similar, especially at smaller sizes on a screen. Unless you’re actively looking for the difference in length, you might not notice it at all. That visual similarity creates a false sense that the marks are more or less equivalent, when in reality they serve completely different grammatical functions.
Part of it is historical. Typewriters only had a hyphen key, so writers got used to using hyphens for everything, including as stand-ins for dashes. That habit carried over into early word processing, and the autopilot stuck for a lot of writers who never had a reason to revisit it.
Part of it is also that style guides genuinely disagree on some of the finer points, particularly around spacing around em dashes. The Chicago Manual of Style says one thing. AP Style says another. If you’ve ever worked across different publications or moved between academic and commercial writing, you’ve probably encountered conflicting rules and decided it wasn’t worth figuring out who was right.
Here’s the thing: it is worth figuring out. Punctuation is not decoration. It’s architecture. It tells a reader how to move through your sentences, where to pause, what connects to what, and what carries extra weight. Used well, these three marks add precision and rhythm to your writing. Used carelessly, they create ambiguity and undermine the professionalism of your work.
So let’s build the foundation properly.
The hyphen is the shortest of the three marks. It sits on the standard keyboard, right there next to the zero, and it’s the one most writers are comfortable with because they’ve been using it since they first learned to type.
Its purpose is to connect. Specifically, it connects words or parts of words to create a single unit of meaning. That sounds straightforward, and in most cases it is, but there are enough nuances and exceptions to make it worth paying attention to.
The most common use of the hyphen is to create compound adjectives, where two or more words team up to modify a noun. When those words come before the noun, they get hyphenated. When they come after, they typically don’t.
So: a well-known author, a state-of-the-art facility, a 20-page document. The hyphen is doing important work here. Without it, “a small business owner” could mean someone who owns a small business, or someone who is a small owner of a business. “A small-business owner” removes the ambiguity immediately.
This is what the hyphen is fundamentally for: clarity, not just convention.
The rule to remember is that the hyphen is dropped when the compound adjective follows the noun. “The author is well known” doesn’t need a hyphen. “A well-known author” does. Writers get this wrong often, in both directions, either hyphenating where it isn’t needed or forgetting to hyphenate where it is.
Certain prefixes almost always take a hyphen in standard British usage: self- (as in self-aware, self-editing), ex- (ex-editor, ex-president), and all- (all-inclusive). Prefixes before proper nouns or proper adjectives are also hyphenated: pre-Raphaelite, anti-British, pro-European.
Others, like anti, co, mid, and non, are more variable. Some words have become so familiar that the hyphen has been dropped entirely over time, email rather than e-mail, for instance. When in doubt, check a current dictionary. Language moves, and what required a hyphen fifteen years ago may no longer.
Some compound nouns retain their hyphens more or less permanently: sister-in-law, merry-go-round, editor-in-chief. Others have been merged into a single word (bookshop, notebook) or left as two separate words (car park, high street). The only reliable rule here is to look it up rather than guess. British and American dictionaries sometimes disagree, so if you’re writing for a UK audience, make sure you’re consulting a UK source.
Hyphenate compound numbers from twenty-one to ninety-nine. Always. And when you write fractions as words, hyphenate those too: one-third, three-quarters, two-fifths. This is one area where the rule is consistent enough that you don’t need to cross-reference anything.
This is the hyphen’s oldest job and the one that matters most in typeset books. When a word must be broken at the end of a line, it breaks at a syllable boundary and a hyphen marks the split. This is handled automatically by professional typesetting software, but it’s worth knowing the rule exists, and understanding that incorrectly hyphenated line breaks are one of the things that a Book formatting services professional catches as a matter of course.
The two mistakes that come up most often in manuscripts are:
Hyphenating after an adverb ending in -ly. “A highly-anticipated release” is wrong. “A highly anticipated release” is correct. The -ly ending signals that the word is already an adverb modifying what follows; a hyphen is redundant and incorrect.
Keeping the hyphen when the compound adjective follows the noun. “The author is well-known” is wrong. “The author is well known” is correct.
The en dash is the middle child of the dash family, longer than a hyphen, shorter than an em dash, and approximately the width of the letter N. It’s the mark that most writers either don’t know exists or quietly replace with a hyphen because they can’t remember the keyboard shortcut. That’s a pity, because the en dash has clear, useful functions that no other mark does quite as well.
This is the en dash’s primary job. When you want to express a range of numbers, dates, times, or pages, the en dash does it cleanly by standing in for the word “to” or “through.”
Pages 12–20. The years 1990–2000. Monday–Friday. 9:00 a.m.–5:00 p.m. May–August.
A hyphen is technically wrong in these contexts, though it’s common to see it used this way, especially in less formally edited writing. If you’re publishing a book and you want it to look professionally produced, the distinction matters. Any quality editing services like the ones at Ireland Publishing House will catch this and correct it as standard.
The en dash can also connect two elements that have an equal, parallel relationship, particularly when those elements are multi-word phrases or proper nouns.
The New York–London flight. The Dublin–Cork route. The author–editor relationship. The pro-leave–pro-remain debate.
Notice that in these examples, a hyphen would look wrong, particularly where the connected elements are already multi-word. The en dash is longer and carries a slightly different weight, signalling connection rather than compounding.
This one is more technical, but worth knowing. When you’re building a compound modifier and one of its components already contains a hyphen, an en dash replaces the outer connection to avoid confusion.
Pre–Civil War era. Post–World War II literature. Non–English-speaking communities.
Without the en dash, you’d get something like “pre-Civil War era,” which looks odd and creates ambiguity about what exactly is being modified. The en dash clarifies the structure.
Spacing Around En Dashes
Standard practice, across British publishing, Chicago, and MLA, is no spaces around an en dash. Pages 12–20, not pages 12 – 20. Some typographers use a thin space for aesthetic reasons, but this is not standard in prose writing.
The em dash is the longest mark in the dash family, roughly the width of the letter M, and it’s also the most versatile. It can do the job of a comma, a colon, parentheses, or a semicolon — and it does it with considerably more drama and emphasis than any of those alternatives.
Used well, the em dash creates rhythm and impact. It draws the reader’s attention to what follows. Used carelessly or too often, it makes writing feel choppy and informal, like someone who keeps interrupting themselves.
When a thought shifts direction abruptly, or when a character in fiction is cut off mid-sentence, the em dash marks that break clearly.
“The answer is simple — or so I thought.” The em dash there signals a pivot, an almost-ironic reversal of what the writer just set up. In dialogue, it marks an interruption: “Wait, I think I know what — “ “Just let me finish.”
Two em dashes can work as a pair to set off a parenthetical element in the middle of a sentence. Think of it as parentheses with emphasis — or commas with considerably more punch.
“The committee — all seasoned professionals — agreed with the proposal.” That phrase in the middle is adding information, but the em dashes make it feel more dramatic and foregrounded than commas would. It also allows you to include a phrase that itself contains commas, without the sentence becoming ambiguous.
A single em dash can stand in for a colon when you want to introduce a list, explanation, or conclusion, typically at the end of a sentence.
“He desired only one thing — peace.” “There were three factors that mattered — time, money, and clarity.” The em dash here delivers the information with a sense of arrival, a satisfying click at the end of the sentence.
The em dash can also be used simply to create emphasis, to underline the importance of a word or phrase.
“This is the most important rule — ever.” The em dash turns what might have been a flat sentence into one that lands with a little more weight.
The difference is simple. A single em dash introduces or concludes — it opens something or closes it. A paired em dash — like this — encloses. One creates a sharp turn in the road. Two create a detour and bring you back.
This is worth saying plainly: the em dash is easy to overuse. When every third sentence contains an em dash, the effect is diluted and the writing starts to feel breathless and uncontrolled. Use it when the emphasis or break is genuinely warranted — not as a default substitute for every other punctuation mark you’re unsure about.
This is one of the few areas where major style guides genuinely disagree, and it’s worth understanding the difference because inconsistency within a document is always noticeable.
Chicago Manual of Style and MLA both use no spaces around em dashes. “The solution—a simple one—was overlooked.” This is the standard for most book publishing and academic writing.
AP Style, used predominantly in journalism, places a space on either side of the em dash. “The solution — a simple one — was overlooked.” This gives the sentence a slightly different visual rhythm and is standard in newspapers and press releases.
Neither is wrong. What is wrong is mixing the two within the same document. Decide which style guide governs your work, follow it, and apply it consistently from the first page to the last.
To make this concrete, here’s a quick reference guide before we move on to common mistakes.
| Punctuation Mark | Appearance / Length | Primary Function | Key Usage | Examples | Keyboard Shortcut (General) |
| Hyphen (-) | Shortest | Connects words or parts of words | Compound adjectives (e.g., well-known), prefixes (e.g., self-aware), compound numbers (twenty-five) | well-known, self-aware, twenty-five | Minus key on keyboard |
| En Dash (–) | Medium length | Indicates a range or connection | Ranges (e.g., pages 12–20), connections (New York–London flight), compound modifiers with hyphenated elements (pre–Civil War) | pages 12–20, New York–London | Windows: Alt + 0150Mac: Option + Hyphen |
| Em Dash (—) | Longest | Indicates a sudden break, parenthetical, list, or emphasis | Sudden breaks (simple—or so I thought), parenthetical statements (committee—all professionals—agreed), introducing a list (one thing—peace) | simple—or so I thought | Windows: Alt + 0151Mac: Option + Shift + Hyphen |
The table above summarises appearance, primary function, key examples, and keyboard shortcuts. The most important things to remember: hyphens connect within words, en dashes mark ranges and equal relationships between phrases, and em dashes create emphasis or structural breaks within sentences.
Think of this as a quick decision framework. When you’re sitting at your desk and you’re not sure which mark to use, run through these questions in order.
Are you connecting two words that together modify a noun before it appears in the sentence? Use a hyphen.
Are you writing a range of numbers, dates, pages, or times — standing in for the word “to” or “through”? Use an en dash.
Are you connecting two proper nouns or multi-word phrases that have an equal, parallel relationship? Use an en dash.
Are you marking a sudden break in thought, a dramatic pause, or an abrupt shift in direction? Use an em dash.
Are you setting off a parenthetical phrase that you want to emphasise more than commas or brackets would? Use a pair of em dashes.
Are you introducing a list, summary, or conclusion after the main part of the sentence? Use a single em dash.
If none of the above apply and you’re reaching for an em dash anyway, stop. Consider whether a comma, colon, or full stop might actually serve you better.
This is where we get practical. These are the errors that appear most consistently in unedited manuscripts, and understanding them is half the battle.
Before: The period 2000-2010 was challenging. After: The period 2000–2010 was challenging.
Why it matters: A hyphen connects parts of a word or compound. An en dash indicates a range. These are structurally different functions, and mixing them up is a grammatical error, not just a stylistic preference.
Before: The author-editor relationship is crucial. After: The author–editor relationship is crucial.
Why it matters: The relationship being described here is one between two independent, equal entities, not a compound word. The en dash is the correct mark for this function.
Before: He was really excited — about the trip. After: He was really excited about the trip.
Why it matters: The em dash here is being used as a dramatic pause where none is needed. The sentence reads perfectly well without it, and adding a dash creates false tension. Em dashes should add something; if they don’t, cut them.
Before (inconsistent within a document): The solution — a simple one — was overlooked… Later: The solution—a clear one—was found. After (Chicago/MLA): The solution—a simple one—was overlooked. The solution—a clear one—was found. After (AP): The solution — a simple one — was overlooked. The solution — a clear one — was found.
Why it matters: Either convention is acceptable. Mixing them within the same document signals that you haven’t made a deliberate choice — and readers and editors notice.
Before: A highly-anticipated release. After: A highly anticipated release.
Why it matters: Adverbs ending in -ly already modify the adjective that follows. A hyphen is redundant and grammatically incorrect in this construction.
Let’s look at a few more real-world examples of the mistakes above corrected, with explanations.
Before: The June-August period is our busiest. After: The June–August period is our busiest. Why: June to August is a range. A range takes an en dash.
Before: He had one goal-success. After: He had one goal—success. Why: The em dash introduces a concluding explanation with emphasis. A hyphen here looks like an incomplete compound word.
Before: A well known author published the self aware character study. After: A well-known author published the self-aware character study. Why: Both compound adjectives come before the noun they modify, so they require hyphens.
Before: She worked Monday-Friday, 9am-5pm. After: She worked Monday–Friday, 9 a.m.–5 p.m. Why: Both are ranges. En dashes, not hyphens.
Knowing the rules is one thing. Being able to type the right mark quickly is another. Here’s how to insert each one on the most common platforms.
Hyphen: Simply use the minus key on your keyboard. There’s no workaround needed — it’s the standard key.
Windows: Alt + 0150 using the numeric keypad. (Num Lock must be on.) Mac: Option + Hyphen (the minus key). Microsoft Word: Ctrl + Minus sign on the numeric keypad. Google Docs: Insert > Special Characters > Punctuation, then search for “en dash.” Alternatively, type a space, two hyphens, and a space between two words and Google Docs will often auto-convert.
Windows: Alt + 0151 using the numeric keypad. (Num Lock must be on.) Mac: Option + Shift + Hyphen. Microsoft Word: Ctrl + Alt + Minus sign on the numeric keypad. Or type two hyphens between words without spaces (word–word) and Word typically auto-converts to an em dash. Google Docs: Insert > Special Characters > Punctuation > Em Dash. Auto-format also works: type two hyphens between words without spaces and the document will often convert automatically.
Memorise the shortcuts for your primary operating system. It takes five minutes to learn them and saves considerable time over a full manuscript. If you frequently work across both platforms, a reference card stuck near your monitor isn’t the most glamorous solution, but it’s effective.
If you’re working with a professional — whether through Ghostwriting services, Cover Designing services, or any other part of the publishing pipeline — it’s worth noting which convention you’re using for em dashes (spaces or no spaces) so that any new content added matches your existing style.
Different publishing contexts call for different style guides. Here’s a quick breakdown of how each of the major three approaches the dash family.
AP Style is the standard for journalism, press releases, and public relations writing. It tends to prefer fewer hyphens than Chicago, many compound modifiers that Chicago would hyphenate, AP closes up or leaves open. On en dashes, AP is notably minimal: it typically uses hyphens or the words “to” and “through” for ranges instead. On em dashes, AP uses a space on either side.
The AP Stylebook is available online and as an app, and it’s the essential reference for any writer working in news media or communications.
Chicago is considered the gold standard for book publishing. Its rules on hyphens are detailed and relatively prescriptive, and it uses the en dash consistently for ranges and connections between equal elements. Em dashes in Chicago have no spaces around them. If you’re working with a traditional publisher, a literary agent, or producing a book intended for bookshop distribution, Chicago is almost certainly the style guide you need to follow.
The Chicago Manual of Style is available online via subscription and is also published in print. It’s comprehensive, thorough, and worth having access to if you’re serious about your craft.
MLA is the standard for academic writing in the humanities. It follows Chicago’s approach to em dashes (no spaces) and uses en dashes for ranges and compound modifiers where one element is already hyphenated. The Purdue OWL (Online Writing Lab) is a free, highly regarded resource that covers MLA style in accessible detail and is a practical first port of call for many writers.
The most significant practical difference between these style guides, the one that’s most likely to affect your day-to-day writing, is the spacing around em dashes. Chicago and MLA say no spaces. AP says add spaces. If you’re writing for a publication, find out which guide they follow before you start. If you’re self-publishing, choose one and apply it consistently.
When working with Marketing services or any professional editor that’s producing promotional copy on your behalf, it’s worth specifying your preferred style guide upfront. Consistency across your author brand matters, and having your website, press releases, and book all following different conventions looks unpolished.
This comes up often enough to warrant its own section. British English does not have a fundamentally different set of rules for hyphens, en dashes, and em dashes, the marks mean the same things on both sides of the Atlantic. However, there are some tendencies worth noting.
British publishers and style guides tend to use the en dash more frequently where American usage might favour an em dash, particularly for parenthetical statements. Some British editorial styles use a spaced en dash in the same role that American Chicago style uses an unspaced em dash. So you might see: “The solution – a simple one – was overlooked” in a British publication, rather than “The solution—a simple one—was overlooked.”
This isn’t a hard rule and it varies considerably between publishers. The important thing, as always, is to check the house style of whoever you’re writing for and apply it consistently. If you’re self-publishing through Ireland Publishing House, this is something that’s handled at the formatting and editing stage so that your book meets professional publishing standards from the outset.
You may have come across references to “four types of dashes” and wondered what the fourth one is, given that we’ve only discussed three.
The hyphen and the en dash and the em dash are the three marks discussed throughout this guide. The fourth mark sometimes included in this grouping is the double em dash (——), formed by two em dashes in sequence. It’s used in some editorial and academic contexts to indicate a missing or redacted word, particularly in legal or archival texts. You might see something like “The defendant, Mr ——, denied all charges.” It’s a specialised use case and not something you’re likely to encounter in standard writing, but it’s worth knowing it exists.
The triple dash (———), sometimes called an em dash triple, occasionally appears in fiction to indicate a long, significant pause or silence — notably in some editions of classic literature. It’s rare in contemporary publishing.
The at sign (@) is sometimes lumped into dash-related punctuation discussions, though it isn’t a dash at all — it’s called the “at sign” or “commercial at” and its primary function is to designate email addresses and social media handles.
While we’ve focused specifically on hyphens, en dashes, and em dashes throughout this guide, it’s worth briefly placing them in the broader context of punctuation, because the relationship between dashes and other marks is where a lot of writers get confused.
The em dash versus the colon is a classic comparison. A colon introduces or explains. An em dash does the same thing, but with more drama and less formality. “There was one explanation: he had been there all along” versus “There was one explanation — he had been there all along.” The em dash version feels more like a reveal; the colon version is more measured and formal.
The em dash versus parentheses is another useful comparison. Parentheses downplay what’s inside them. Em dashes emphasise it. “The committee (all seasoned professionals) agreed” versus “The committee — all seasoned professionals — agreed.” The parentheses version makes the detail feel like a side note. The em dash version makes it feel important.
The em dash versus the comma is perhaps the most common area of uncertainty. Commas create gentle pauses and connect related elements with minimal disruption. Em dashes create emphatic breaks. If you read the sentence aloud and the pause is significant — weighted, intentional, pointed — an em dash is appropriate. If it’s just a natural breath in the flow of the sentence, a comma is the right choice.
Understanding these relationships helps you make deliberate punctuation choices rather than defaulting to whatever feels most natural in the moment. That’s the difference between a writer who knows the rules well enough to break them purposefully, and one who simply gets lucky some of the time.
It’s easy to treat punctuation as an arbitrary set of rules handed down from on high, rules you have to follow to avoid red ink in the margin. But punctuation is actually about something more fundamental: it’s about how your reader experiences your writing.
Every punctuation mark sends a signal. A full stop says: we’re done here. A comma says: keep going, but take a breath. A question mark changes the entire tone of what came before it. And dashes — all three of them — carry their own distinct signals.
A hyphen says: these two things are one thing. An en dash says: we’re moving through a range, or connecting two equivalent things. An em dash says: pay attention here — this is where something shifts.
When you use these marks correctly, your reader doesn’t consciously notice them. The sentence just feels right. The rhythm makes sense. The emphasis lands where it should. When you use them incorrectly, something is slightly off, and while a casual reader might not be able to name the problem, they feel it.
This is particularly important in professionally published books. Readers who pick up a title that Ireland Publishing House has helped produce expect a certain standard of finish, the same standard they’d expect from any traditionally published title. Punctuation inconsistencies at the level of hyphens and dashes are exactly the kinds of detail that distinguish a professionally produced book from a self-published one that was put together too quickly.
There’s a temptation to hand the whole problem over to a grammar checker and move on. Grammarly, ProWritingAid, the built-in tools in Microsoft Word, these are genuinely useful for catching obvious errors, and there’s no reason not to use them. But they have real limitations when it comes to dashes.
Grammar checkers often flag em dashes as potential errors. They sometimes suggest replacing en dashes with hyphens. They can’t always tell the difference between a correctly used em dash for parenthetical emphasis and an incorrectly used one substituting for a comma. They don’t know which style guide you’re following.
Use these tools as a safety net, not a replacement for your own understanding. Knowing the rules yourself means you can override incorrect suggestions with confidence, rather than accepting changes that might introduce new errors.
This is the same principle that applies to any element of your writing. Tools can support the process, but they can’t replace the judgement that comes from understanding why a rule exists and how it functions in practice.
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