Confused about Forty or Fourty? You’re definitely not the only one. I’ve seen this spelling mistake countless times in emails, social media posts, school assignments, and even professional documents.
Since both words look so similar, it’s easy to wonder which one is actually correct. The good news is that the answer is simple once you understand the rule behind it. You’re improving your English, preparing for an exam, or just want to write with confidence, knowing the correct spelling can help you avoid a common mistake.
In this guide, I’ll explain the difference between Forty and Fourty, why people often confuse them, and how to remember the correct spelling with easy examples.
Quick Answer
The correct spelling is forty.
The spelling fourty is incorrect and should not be used in either British English or American English.
✅ Correct: forty people attended the meeting.
❌ Incorrect: fourty people attended the meeting.
This rule applies everywhere, including the UK, the US, Canada, Australia, and other English-speaking countries.
Meaning of the Correct Form: Forty
The word forty represents the number 40, which comes after thirty-nine and before forty-one.
It is used in mathematics, dates, ages, quantities, prices, measurements, and countless everyday situations.
Examples in British English
- The train was delayed by forty minutes.
- She celebrated her fortieth birthday in London.
- The project required forty employees to complete.
- The company invested forty thousand pounds in the campaign.
- There were forty students in the classroom.
Examples in American English
- The meeting lasted for forty minutes.
- He drove forty miles to work every day.
- The team hired forty new workers this year.
- She paid forty dollars for the jacket.
- The school has more than forty teachers.
Although British and American English sometimes differ in spelling and vocabulary, there is absolutely no difference here. Both countries use forty.
Why Is Forty Spelled Without “u”?
Historically, the word evolved from the Old English term for four tens. Over time, the spelling changed and eventually became standardized as forty.
While the word four contains the letter u, the number forty lost that letter during its development in the English language.
This historical change explains why many people continue to make the mistake today.
Meaning of the Incorrect Form: Fourty
The word fourty has no official meaning in modern English dictionaries because it is not considered a correct English word.
It is simply a spelling error that occurs because people assume the spelling should match the word four.
Why Do People Write Fourty?
Several reasons contribute to this common mistake:
- The number four includes the letter u.
- Most number words follow predictable patterns.
- English spelling rules often seem inconsistent.
- Many people learn the word through speaking rather than reading.
- Typing quickly can lead to spelling mistakes.
Despite these reasons, dictionaries, style guides, educational institutions, and grammar experts all agree that fourty is incorrect.
Dictionaries Confirm the Correct Spelling
Every major dictionary lists forty as the correct spelling:
- Oxford Dictionary
- Cambridge Dictionary
- Merriam-Webster Dictionary
- Collins Dictionary
- Macmillan Dictionary
None of these dictionaries accept fourty as a valid alternative spelling.
Forty or Fourty: Key Differences
The following table makes the distinction easy to understand.
| Feature | Forty | Fourty |
| Correct English spelling | Yes | No |
| Accepted in British English | Yes | No |
| Accepted in American English | Yes | No |
| Found in dictionaries | Yes | No |
| Appropriate in academic writing | Yes | No |
| Appropriate in business writing | Yes | No |
| Recommended for exams | Yes | No |
The table clearly shows that only forty should be used.
Is There a Difference Between UK and US English?
One of the first questions readers ask is whether British English and American English treat the word differently.
The answer is no.
Unlike words such as:
- colour vs color
- organise vs organize
- traveller vs traveler
- centre vs center
there is no regional variation with forty.
British English
British English uses:
✅ forty
❌ fourty
American English
American English also uses:
✅ forty
❌ fourty
Therefore, regardless of where you live, the correct spelling remains exactly the same.
Why This Mistake Is So Common
The confusion between forty and fourty is one of the most common spelling mistakes involving numbers.
Pattern Confusion
Many number words follow a predictable pattern:
- four
- fourteen
- forty? (expected)
- fourth
Because all these related words contain the letter u, writers often assume that forty should also include it.
Similar Number Spellings
Consider these examples:
- twenty
- thirty
- fifty
- sixty
- seventy
- eighty
- ninety
Most numbers ending in -ty are formed directly from their root word.
However, forty breaks this pattern.
Pronunciation Problems
Another reason is pronunciation.
When people say forty, they usually do not strongly pronounce the missing letter because there is no sound difference.
As a result, many people spell the word according to what they think they hear.
Common Mistakes People Make
Many writers make similar errors involving the word forty.
Mistake 1: Using Fourty in Formal Writing
Incorrect:
- The conference attracted fourty delegates.
Correct:
- The conference attracted forty delegates.
Mistake 2: Writing Fourty in Exams
Incorrect:
- The answer is fourty-two.
Correct:
- The answer is forty-two.
Examiners in both the UK and the US may mark this as a spelling error.
Mistake 3: Writing Fourty on Business Documents
Incorrect:
- Invoice amount: Fourty dollars.
Correct:
- Invoice amount: Forty dollars.
Professional documents should always use the correct spelling.
Mistake 4: Misspelling Compound Numbers
Incorrect:
- fourty-one
- fourty-three
- fourty-eight
Correct:
- forty-one
- forty-three
- forty-eight
The rule applies to every number containing forty.
Mistake 5: Misspelling Ordinal Numbers
Incorrect:
- fourtieth
Correct:
- fortieth
Remember that the ordinal form also follows the correct spelling pattern.
Correct Usage in Sentences
Examples are one of the best ways to remember grammar rules.
British English Examples
- The museum welcomed forty visitors before noon.
- She waited forty minutes for the bus.
- The football club celebrated its fortieth anniversary.
- The package weighed forty kilograms.
- There were forty applicants for the position.
- The village is located forty miles from Manchester.
- He spent forty pounds on groceries.
American English Examples
- The movie lasted forty minutes longer than expected.
- The company employs over forty engineers.
- She saved forty dollars on the purchase.
- The city received forty inches of snow last winter.
- The class included forty students.
- The runner completed the race in forty minutes.
- He turned forty years old this year.
Examples in Academic Writing
- The survey included responses from forty participants.
- Researchers monitored the results for forty days.
- The study examined forty separate cases.
Examples in Business Writing
- Sales increased by forty percent.
- The organisation hired forty new employees.
- The project budget reached forty million dollars.
Forty in Compound Numbers
The spelling rule becomes especially important when writing larger numbers.
Correct Examples
- forty-one
- forty-two
- forty-three
- forty-four
- forty-five
- forty-six
- forty-seven
- forty-eight
- forty-nine
Incorrect Examples
- fourty-one
- fourty-two
- fourty-three
- fourty-four
- fourty-five
Whenever you write numbers between 40 and 49, remember that the first part is always forty.
Forty in Ordinal Numbers
Ordinal numbers indicate position or order.
Examples include:
- first
- second
- third
- fourth
For forty, the correct ordinal form is:
✅ fortieth
Examples:
- Today is her fortieth birthday.
- The company celebrated its fortieth year in business.
- He finished in fortieth place.
The form fourtieth is incorrect.
Memory Tricks to Remember the Correct Usage
Learning a simple memory trick can prevent future mistakes.
Trick 1: Forty Loses the U
Think of this sentence:
“Forty forgot the U.”
Many learners remember the rule instantly using this phrase.
Trick 2: Only Four Keeps the U
Remember:
- four → keeps the U
- forty → loses the U
Trick 3: Check Your Spell Checker
Modern spell checkers highlight fourty as an error.
Therefore, if your software marks it as incorrect, trust the correction.
Trick 4: Memorise Forty-One
Because compound numbers appear frequently, remembering forty-one helps reinforce the correct pattern.
Trick 5: Read the Word Frequently
The more often you see forty in books, newspapers, and articles, the more natural the spelling becomes.
Reading remains one of the best ways to improve spelling accuracy.
Similar English Words That Break Patterns
English contains many words that do not follow expected spelling rules.
Examples include:
| Expected | Actual |
| fourty | forty |
| recieve | receive |
| seperate | separate |
| definately | definitely |
| occured | occurred |
Understanding that English contains exceptions makes it easier to accept the spelling of forty.
Why Correct Spelling Matters
Some people wonder whether a small spelling mistake really matters.
The answer is yes.
Correct spelling improves:
- professionalism
- credibility
- readability
- academic performance
- communication quality
In addition, spelling errors can distract readers and reduce confidence in your writing.
For businesses, even small mistakes may affect customer trust.
Therefore, learning the correct spelling of common words is worthwhile.
Frequently Asked Questions
Is forty or fourty correct?
Forty is correct. Fourty is incorrect in both British and American English.
Why is forty not spelled fourty?
The spelling developed historically and eventually became standardized as forty, dropping the letter u.
Is fourty accepted in British English?
No. British English only accepts forty.
Is fourty accepted in American English?
No. American English also only accepts forty.
How do you write 40 in words?
The number 40 is written as forty.
Is forty-first correct?
Yes. Forty-first is correct.
Is fourtieth correct?
No. The correct ordinal form is fortieth.
Why do so many people write fourty?
People often assume the spelling should follow the word four, which contains the letter u.
Does Microsoft Word mark fourty as incorrect?
Yes. Most spell checkers identify fourty as a spelling mistake.
Are there any countries where fourty is acceptable?
No. All major English-speaking countries use forty.
Conclusion
The debate between forty or fourty has a very clear answer: forty is the only correct spelling.
Although many people expect the number to include the letter u because of the word four, English developed differently over time. As a result, fourty became a common mistake rather than an accepted spelling.
The rule remains the same in both British and American English. Whether you are writing for readers in London, New York, Sydney, Toronto, or anywhere else, you should always use forty.
To remember the rule, simply think:
“Forty forgot the U.”
If you found this guide helpful, save it for future reference and share it with anyone who still writes fourty instead of forty.
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Ethan Brooks is a passionate writer who loves making English simple and easy to understand. He specializes in explaining text meanings, abbreviations, grammar, symbols, and everyday language in a clear, friendly way. His goal is to help readers quickly find accurate answers and improve their communication with confidence.
