Eightteen or Eighteen: What’s the Difference? (With Examples)
Eighteen is the correct spelling of the number 18. Eightteen is simply a misspelling — an extra t sneaks in because the root word “eight” ends with one. There’s no choice to make here: one is right, and one is wrong.
Correct: “She just turned eighteen last week.” Misspelled: “She just turned eightteen last week.” The second version will get flagged by every spellchecker.
Table of Contents
Quick Answer
| Word | Part of Speech | Main Meaning | Example |
|---|---|---|---|
| eighteen | Number (cardinal) | The number 18, one more than seventeen | “Eighteen students passed the test.” |
| eightteen | — | Not a word — a misspelling of “eighteen” | ❌ “He is eightteen years old.” |
Simple rule: eighteen has one t — “eight” loses a t when it grows into “eighteen.”
What Does Eightteen Mean?
Eightteen doesn’t mean anything — it’s not a word in any dictionary. It appears when writers combine “eight” and “teen” and keep both ts: eight + teen. Spellcheckers underline it in red, teachers mark it wrong, and it never appears in published books. If you catch yourself typing it, delete one t.
Examples:
- ❌ The sign said “eightteen items or less.”
- ❌ My brother is eightteen now.
- ❌ She scored eightteen out of twenty.
- ❌ The package weighs eightteen kilos.
What Does Eighteen Mean?
Eighteen is the cardinal number 18 — the whole number that comes after seventeen and before nineteen. Merriam-Webster lists eighteen as the standard spelling, defined as one more than seventeen. It’s also a milestone age in many countries: the age of voting, driving, and legal adulthood. In writing, use the word form in general text and the numeral 18 in technical or statistical contexts. The word also shows up in fixed phrases — “eighteen holes” of golf, “eighteen wheels” on a big rig, “eighteen karat” gold — where a doubled t would look especially sloppy.
Examples:
- She just turned eighteen last week.
- Eighteen students signed up for the trip.
- The legal voting age here is eighteen.
- He ran eighteen miles before breakfast.
- Our team won by eighteen points.
Eightteen vs. Eighteen: Key Differences
| Feature | eightteen | eighteen |
|---|---|---|
| Correct spelling? | No — misspelling | Yes — the only correct form |
| In dictionaries | Not listed | Listed everywhere |
| Number of ts | Two (the mistake) | One |
| Meaning | None | The number 18 |
| Spellchecker reaction | Red underline | Accepted |
| Use it? | Never | Always |
This pair isn’t a style choice — it’s right versus wrong, so the fix is a single deleted t.
Usage in Real Sentences
At Home
Correct: “Dinner will be ready in eighteen minutes.” / Misspelled: “Dinner will be ready in eightteen minutes.” The extra t is the only difference, and it’s the only thing wrong.
In Conversation
Correct: “My daughter is eighteen now.” / Misspelled: “My daughter is eightteen now.” Nobody hears the difference when you speak — the error only shows up in writing.
At School or Work
Correct: “Submit all eighteen pages by Friday.” / Misspelled: “Submit all eightteen pages by Friday.” In an email or assignment, that doubled t makes the writer look careless.
In Writing
Correct: “The essay was eighteen pages long, footnotes included.” / Misspelled: “The essay was eightteen pages long, footnotes included.” In print the error can’t hide behind pronunciation — readers see the double t immediately.
Common Mistakes
English is full of traps where a root word’s spelling misleads you — people write recieve vs receive the wrong way round, and dieing or dying trips up even confident writers.
Mistake 1: Keeping both t’s from “eight” + “teen”
❌ Wrong: There were eightteen candles on the cake.
✅ Right: There were eighteen candles on the cake.
Why: “Eight” ends in t and “teen” starts with t, but the compound word uses only one — English drops the duplicate.
Mistake 2: Typing fast and not proofreading
❌ Wrong: The course lasts eightteen weeks.
✅ Right: The course lasts eighteen weeks.
Why: Fast fingers repeat the t. A quick re-read or a spellchecker catches it instantly.
Mistake 3: Thinking the double-t version looks “more correct”
❌ Wrong: “Eightteen follows the pattern of eight, so it must be right.”
✅ Right: “Eighteen drops the extra t, like sixteen and nineteen do.”
Why: Look at the family: sixteen, seventeen, nineteen — all single-t after the root. Eighteen follows the same pattern.
Mistake 4: Writing “18th” as “eightteenth”
❌ Wrong: Her eightteenth birthday is in June.
✅ Right: Her eighteenth birthday is in June.
Why: The ordinal form has the same single-t rule: eighteenth, not eightteenth.
Pronunciation
Eighteen is pronounced “AY-TEEN” — stress the first syllable, then a crisp “teen” like the end of “thirteen.” The misspelling “eightteen” sounds exactly the same out loud, which is why the error survives: your ear can’t catch what your eyes need to fix. It rhymes with “between,” “sixteen,” and “green.”
How to Remember the Difference
Break it apart: EIGHT + EEN. The word is just “eight” with the ending “-een” — and “-een” already brings its own t sound from “teen,” so “eight” donates only eigh. One t is enough; two is a crowd.
- Eighteen = correct, one t, the number 18.
- Eightteen = misspelling, two ts, not a word.
- Think “eight + een” and the extra t disappears.
Frequently Asked Questions
Is it eightteen or eighteen?
It’s eighteen with one t. “Eightteen” with two ts is a misspelling — it isn’t a word in any dictionary.
Why do so many people write “eightteen”?
Because “eight” ends with t and “teen” starts with one, so writers naturally keep both. English compounds usually drop the duplicate letter, which is the step people forget.
Is “eightteen” ever acceptable?
No. Unlike pairs where both spellings work, this one has a single correct answer: eighteen. No style guide, dictionary, or region accepts the double-t version, so always fix it.
Should I write 18 or eighteen in an essay?
Most style guides say to spell out numbers under one hundred in formal prose, so “eighteen” is the safer choice in essays. Numerals like “18” suit tables, statistics, and technical writing. Either way, the spelling of the word form never changes.
How do you spell the 18th: eightteenth or eighteenth?
Eighteenth — the same single-t rule applies to the ordinal form.
Do other teen numbers have this problem?
Not really — sixteen, seventeen, and nineteen don’t double any letters, so eighteen is the only teen number people consistently misspell.
Conclusion
Eighteen is correct; eightteen is a misspelling with one t too many. Remember “eight + een,” delete the extra letter, and this error is gone for good.
