If you are writing the number 40 in words, the correct spelling is forty. The form fourty is a common spelling mistake, not a standard alternative.
The confusion is understandable. The word four contains a u, and fourteen also keeps that letter. It can therefore seem logical to write fourty. Standard English, however, uses forty.
This spelling stays the same when you use 40 in everyday writing, professional communication, schoolwork, and other standard US English contexts.
Quick Answer
Forty is correct. Fourty is incorrect in standard modern English.
Use forty whenever you mean the number 40:
- forty people
- forty minutes
- forty dollars
- forty years
- forty pages
The same spelling remains in compound numbers:
- forty-one
- forty-two
- forty-five
- forty-nine
The ordinal form is fortieth, also without the u.
Why People Confuse Them
The main reason is the spelling of four.
You may naturally think:
four + ty = fourty
That pattern looks reasonable, but it does not produce the standard spelling. English number words do not always follow a perfectly predictable spelling pattern.
The connection becomes even more confusing because fourteen contains the u, while forty does not.
The result is an easy visual mistake: someone knows that 4 is four, remembers that 14 is fourteen, and assumes 40 should be fourty.
That assumption is incorrect. The established spelling is forty.
Key Differences At A Glance
| Context | Best Choice | Why |
|---|---|---|
| Number 40 | forty | Standard spelling |
| Quantity | forty | Used to express 40 items or people |
| Age | forty | Standard form for the number |
| Money | forty | Example: forty dollars |
| Time | forty | Example: forty minutes |
| Compound number | forty | Example: forty-five |
| 40th | fortieth | Standard ordinal form |
| Modern standard writing | forty | Fourty is a misspelling |
A useful way to remember the distinction is simple:
- four = 4
- fourteen = 14
- forty = 40
- fortieth = 40th
There is no standard modern situation in which fourty should replace forty.
Meaning and Usage Difference
Forty represents the number 40. It can describe a quantity, age, measurement, amount, or other numerical value.
For example:
The class has forty students.
She turned forty this year.
The package weighs forty pounds.
Fourty does not have a separate modern meaning. It is normally an incorrect attempt to spell forty.
Pronunciation can add to the confusion because speakers do not normally pronounce an extra u in the written form fourty. In American English, forty can be represented approximately as FOR-tee, with the main stress on the first syllable.
The incorrect spelling does not create a separate standard pronunciation.
Tone, Context, and Formality
There is no special formal or informal meaning attached to forty. It is appropriate wherever the number 40 needs to be written as a word.
You can use forty in:
- casual messages
- school assignments
- business writing
- professional documents
- articles
- formal correspondence
The important difference is correctness, not tone.
Fourty should not be chosen because a sentence is casual or conversational. It remains a spelling error in standard US English.
For example:
The meeting starts in forty minutes.
This is correct whether the sentence appears in a text message, an email, or a professional schedule.
Which One Should You Use?
Choose forty whenever you write the number 40 as a word.
Use it for:
Age:
My brother is forty years old.
Quantity:
Forty customers attended the event.
Money:
The shirt costs forty dollars.
Time:
We waited forty minutes.
Measurement:
The road is forty miles long.
Compound numbers:
Forty-two applicants applied.
If you are writing a numeral instead of spelling out the number, simply use 40 when that format fits your document. The spelling question arises when you choose to write the number in words.
When One Choice Sounds Wrong
Fourty can look convincing because it resembles four. However, familiarity does not make it a standard spelling.
For example:
❌ She is fourty years old.
✅ She is forty years old.
Likewise:
❌ The package contains fourty items.
✅ The package contains forty items.
The incorrect form can appear understandable to readers, but that does not make it acceptable in standard writing. When proofreading, replace fourty with forty.
Common Mistakes (and Quick Fixes)
The most common mistake is simply adding the u from four.
Incorrect: fourty
Correct: forty
The same mistake can appear in larger numbers.
Incorrect: fourty-five
Correct: forty-five
Another related mistake occurs with the ordinal form.
Incorrect: fourtieth
Correct: fortieth
The plural form referring to the decade is also spelled without the u:
forties, not fourties.
A simple memory aid is:
Four has a u. Forty does not.
Once you remember that difference, the related forms become easier to recognize.
Everyday Examples
Here are natural examples using the correct spelling:
- The store opens in forty minutes.
- She turned forty last month.
- We invited forty guests to the wedding.
- The package weighs forty pounds.
- He saved forty dollars.
- The school has forty classrooms.
- The drive takes about forty minutes.
- Forty employees attended the meeting.
- The book has forty pages.
- She finished in fortieth place.
Notice that forty remains unchanged when it describes quantity, age, money, time, or measurement.
When another number follows it, use the compound form:
The survey received forty-three responses.
The base spelling remains forty.
Dictionary-Style Word Details
Verb
- Fourty: Not commonly used as a verb in standard US English.
- Forty: Not commonly used as a verb either. It is primarily a number word rather than a verb.
Noun
- Forty: Can function as a noun when referring to the number itself.
Forty is a multiple of ten. - Fourty: Not a standard modern noun. It is normally a misspelling of forty.
Synonyms
- Forty: There is no exact ordinary synonym that replaces the number word in normal writing. The number 40 is a plain descriptive alternative.
- Fourty: No standard synonyms apply because it is not the accepted spelling of a separate word.
Neither form has a useful standard antonym because a number such as 40 does not have a direct opposite in ordinary English usage.
Example Sentences
- Forty: The restaurant can seat forty people.
- Forty: He has lived there for forty years.
- Fourty: Avoid this spelling in standard writing.
Word History
Forty has a long history in English and traces back to an Old English form associated with the number four and a group of ten. Historical English records contain different spellings, including forms resembling fourty, but the modern standard form is forty.
The modern spelling therefore does not simply follow the visible spelling of four. It became established as forty.
Phrases Containing
- Forty: Common expressions and combinations include forty minutes, forty dollars, forty-year-old, forty-five, in your forties, and forty winks.
- Fourty: No standard modern phrases use fourty as the accepted spelling.
FAQs
Is fourty or forty correct?
Forty is correct. The spelling represents the number 40 in standard modern English. Fourty is a common misspelling caused by the spelling of four, but it is not an accepted modern alternative. Use forty in standard US writing.
Is fourty ever correct in modern English?
Fourty is not correct for ordinary modern standard English. You may encounter it in old material or as a spelling mistake, but that does not make it a current spelling choice. For present-day writing, use forty whenever you mean the number 40.
Why is forty spelled without the u?
Forty developed with a spelling that differs from four. English number words have changed over time, and their modern spellings do not always follow a simple pattern. The established form today is forty, even though four and fourteen contain a u.
Is forty the same in American and British English?
Yes, both use forty. The spelling does not represent a US-versus-British difference. If you are writing for a US audience, use forty. If you are reading British English, you will also encounter forty, not fourty, as the standard spelling.
How do you spell forty-five?
Forty-five is the correct spelling. Keep forty without the u, then add a hyphen before the final number. The same pattern applies to forty-one through forty-nine when those compound numbers are written as words.
What is the correct spelling of 40th?
Fortieth is the correct spelling of 40th. It also has no u. Use fortieth for an ordinal meaning, such as “her fortieth birthday.” Do not write fourtieth or assume the spelling should follow fourth.
Conclusion
The answer is straightforward: Fourty or Forty: Which Is Correct in US English?is the correct spelling of 40, while fourty is a misspelling in standard modern US English.
The confusion comes mainly from the spelling of four and fourteen, which makes fourty look logical. But the established form is forty.
Remember the simplest rule: four has a u; forty does not. The same spelling carries into forty-one, forty-five, and fortieth.
