Forty is the correct spelling of the number 40 in English. Fourty is a common misspelling and is not recognized as a standard English word.
Have you ever paused while writing forty and wondered whether it should actually be spelled fourty because it comes from the word four? You’re not alone. This is one of the most common English spelling mistakes, and it catches native speakers, students, and English learners alike.
The confusion is understandable. Since four contains the letter u, many people naturally assume the number should become fourty. However, English doesn’t always follow predictable spelling patterns. In this case, only one spelling is accepted in modern English.
In this guide, you’ll learn the difference between forty and fourty, why the confusion exists, what dictionaries and style authorities recommend, and how to remember the correct spelling forever. You’ll also find practical examples, common mistakes to avoid, and a short quiz to test your understanding.
Forty or Fourty: Which Is Correct?
Quick Answer
Forty is the only correct spelling in standard English.
Fourty is incorrect and should not be used in formal or informal writing.
| Spelling | Correct? | Should You Use It? |
| Forty | ✅ Yes | Always |
| Fourty | ❌ No | Never |
Whether you’re writing an email, a school assignment, a business report, or a social media post, the correct spelling is always forty.
Examples
✅ I turned forty last month.
✅ She saved forty dollars this week.
❌ I turned fourty last month.
Is “Fourty” Ever Correct?
Quick Answer
No. Fourty is not considered a correct English spelling.
Many people assume it should be correct because the word four contains the letter u. However, English has retained the spelling forty for centuries, and every major English dictionary recognizes only this form.
You’ll see fourty in:
- Typing mistakes
- Student writing
- Social media posts
- Online comments
- Informal messages
But that doesn’t make it correct.
If you’re writing for school, work, exams, publishing, or professional communication, always choose forty.
Why Do People Spell Forty as Fourty?
Quick Answer
People usually write fourty because it seems more logical based on the spelling of four.
Several factors contribute to this common mistake.
1. The Influence of “Four”
Most English numbers keep the spelling of their root word.
Examples:
- four → fourteen
- four → fourth
- four → foursome
So many writers naturally expect:
four → fourty
Instead, English uses:
four → forty
This irregular spelling surprises many learners.
2. Pronunciation Doesn’t Help
Both forty and fourty would sound almost identical when spoken.
Because the missing u isn’t pronounced, many people never realize they’ve misspelled the word.
3. English Has Other Irregular Spellings
English contains many words whose spelling doesn’t perfectly match their origin.
For example:
| Expected | Actual |
| fourty | forty |
| judgement (US often accepts judgment) | judgment |
| publically | publicly |
Learning these exceptions is simply part of mastering English spelling.
4. Autocorrect Isn’t Always Enough
Modern spell checkers often catch fourty, but they aren’t perfect.
If you’re typing quickly or using software without spell checking, the mistake can easily go unnoticed.
That’s why it’s worth remembering the correct spelling rather than relying on technology.
What Does Forty Mean?
Quick Answer
Forty is the written form of the number 40.
It represents:
- The number between 39 and 41
- A quantity of forty items
- Someone who is 40 years old
- A group consisting of forty members or objects
Examples
Everyday conversation
My father turns forty next week.
Business
The company hired forty new employees this year.
Academic
The survey included forty participants.
News writing
Rescue teams found forty survivors after the storm.
Word Origin: Why Isn’t It Spelled “Fourty”?
Quick Answer
Although forty comes from four, English gradually dropped the letter u during the language’s historical development.
In Old English, number spellings evolved over centuries before becoming standardized. By the time modern English dictionaries established official spellings, forty had already become the accepted form.
This is why every major dictionary—including Merriam-Webster, Cambridge Dictionary, and the Oxford English Dictionary—lists forty as the standard spelling.
Today, fourty survives only as a common spelling mistake rather than an accepted variant.
How to Pronounce Forty
Quick Answer
Forty is pronounced /ˈfɔːr.ti/ (British English) or /ˈfɔr.t̬i/ (American English). Despite the spelling difference, forty and the incorrect form fourty would be pronounced almost the same, which is one reason people often misspell the word.
Pronunciation Guide
| English Variety | Pronunciation | Sounds Like |
| American English | FOR-tee | FOR-tee |
| British English | FOR-tee | FOR-tee |
Because the u in four isn’t distinctly heard in speech, many writers instinctively insert it when spelling the word. This is a classic example of pronunciation influencing spelling.
Tip: When speaking, you won’t hear a difference—but when writing, always remember that the correct spelling is forty, not fourty.
Forty vs Fourty: Comparison Table
Quick Answer
Only forty is recognized as the correct spelling in modern English. Fourty is a misspelling and should be avoided in all types of writing.
| Feature | Forty | Fourty |
| Correct spelling | ✅ Yes | ❌ No |
| Dictionary entry | ✅ Yes | ❌ No |
| Standard English | ✅ Yes | ❌ No |
| Accepted in formal writing | ✅ Yes | ❌ Never |
| Accepted in academic writing | ✅ Yes | ❌ Never |
| Accepted in business writing | ✅ Yes | ❌ Never |
| Used in exams | ✅ Yes | ❌ Marked incorrect |
| Common spelling mistake | ❌ No | ✅ Yes |
| Example | Forty students attended. | ❌ Fourty students attended. |
Bottom line: If you’re ever unsure, choose forty. There are no situations where fourty is the preferred spelling.
Examples of Correct Usage
Quick Answer
The word forty works in every context—from casual conversations to professional documents. Seeing it used in different situations can help reinforce the correct spelling.
Everyday Conversation
✅ I walked forty minutes to work today.
✅ We invited forty guests to the party.
Formal Writing
✅ The committee consists of forty members.
✅ The report contains forty recommendations
Academic Writing
✅ The experiment involved forty participants.
✅ Students completed forty practice questio
Business Communication
✅ Sales increased by forty percent this quarter.
✅ We shipped forty orders before noon.
Dates and Ages
✅ She celebrated her fortieth birthday last week.
✅ He waited forty days before making a decision.
Incorrect Examples
❌ The class has fourty students.
❌ She is fourty years old.
Each sentence should use forty instead.
What Do Major Dictionaries Say?
Quick Answer
Leading English dictionaries unanimously recognize forty as the standard spelling. Fourty is not listed as an accepted variant.
Here’s what respected language authorities indicate:
| Authority | Recommendation |
| Merriam-Webster | Forty is the correct spelling. |
| Cambridge Dictionary | Lists forty as the standard form. |
| Oxford English Dictionary | Recognizes forty only. |
| Collins Dictionary | Uses forty exclusively. |
| Dictionary.com | Defines forty; treats fourty as incorrect. |
This consistency across major dictionaries leaves little room for confusion: forty is the only accepted spelling.
Do Style Guides Recommend “Forty” or “Fourty”?
Quick Answer
Although major style guides don’t usually devote a rule specifically to this word, they all follow standard dictionary spellings. That means they consistently use forty.
Whether you’re writing in:
- journalism,
- academic papers,
- books,
- business documents,
- government reports,
the expected spelling is always forty.
If you’re following respected style manuals, such as those commonly used in publishing or journalism, you’ll naturally end up using the correct form because they rely on established dictionary spellings.
Common Mistakes to Avoid
Quick Answer
Most mistakes happen because people apply logical spelling patterns to a word that happens to be an exception.
Here are the most common errors.
Mistake 1: Adding the Letter U
❌ Fourty
✅ Forty
Remember: although four contains u, forty does not.
Mistake 2: Assuming Spell Check Will Catch It
Some writing apps immediately flag fourty, but not all do. Always proofread your work, especially if you’re writing for school or work.
Mistake 3: Copying Incorrect Online Content
The internet contains plenty of spelling mistakes. Seeing fourty on blogs, forums, or social media doesn’t make it correct.
When in doubt, verify the spelling using a trusted dictionary.
Mistake 4: Confusing Spoken English with Written English
Since both spellings sound almost identical, pronunciation isn’t a reliable guide.
Instead, train yourself to recognize forty as the standard written form.
Memory Tricks to Remember the Correct Spelling
Quick Answer
A simple memory trick can prevent this mistake for good.
Trick 1: Think “Forty Loses the U”
Four has a U.
Forty does not.
Many learners remember it with the phrase:
“Forty forgets the U.”
Trick 2: Picture the Number
Whenever you write 40, mentally say:
“Forty equals forty—not fourty.”
Connecting the numeral with the spelling strengthens your memory.
Trick 3: Read More Correct Examples
The more often you encounter forty in books, newspapers, and trusted websites, the more natural the spelling becomes.
Repeated exposure is one of the most effective ways to eliminate spelling mistakes.
Trick 4: Practice Writing It
Write these sentences several times:
- I saved forty dollars.
- There are forty students.
- She is forty years old.
A little repetition goes a long way.
Quick Recap
✅ Forty = Correct
❌ Fourty = Incorrect
If you remember just one thing from this guide, let it be this:
Every time you write the number 40, spell it “forty.”
Practice Quiz
Test Your Understanding
Choose the correct answer for each question. Answers are provided below.
1. Which spelling is correct?
A. Fourty
B. Forty
Answer
✅ B. Forty
2. Complete the sentence.
There were ______ people at the meeting.
A. fourty
B. forty
Answer
✅ B. forty
3. True or False
Fourty is an accepted alternative spelling in modern English.
Answer
❌ False
Only forty is correct.
4. Which sentence is written correctly?
A. She celebrated her fourty birthday.
B. He waited fourty minutes.
C. Forty students passed the exam.
D. The company hired fourty employees.
Answer
✅ C. Forty students passed the exam.
5. Fill in the blank.
My grandmother turned ______ last year.
Answer
✅ forty
6. Which statement is correct?
A. Both forty and fourty are acceptable.
B. Fourty is preferred in British English.
C. Forty is correct in all varieties of English.
D. Both spellings appear in modern dictionaries.
Answer
✅ C. Forty is correct in all varieties of English.
Key Takeaways
- ✅ Forty is the only correct spelling of the number 40.
- ❌ Fourty is a common misspelling and should be avoided.
- The confusion arises because the word four contains the letter u, while forty does not.
- Major dictionaries, including Merriam-Webster, Cambridge, and Oxford, recognize only forty.
- Use forty in everyday, academic, business, and professional writing.
- A simple memory trick is: “Forty forgets the U.”
Frequently Asked Questions (FAQ)
Is forty or fourty correct?
Forty is the correct spelling in English. Fourty is a common misspelling and should never be used in formal or informal writing.
Why isn’t forty spelled fourty?
Although the number comes from four, English spelling evolved over time, and the accepted form became forty. This historical spelling has been standardized for centuries and is recognized by all major dictionaries.
Is fourty a real word?
No. Fourty is not recognized as a standard English word. If you use it in exams, professional writing, or published content, it will generally be considered a spelling mistak
Do British and American English spell it differently?
No. Both British English and American English use forty. There is no regional variation for this word.
Is fourty ever acceptable in informal writing?
Even in casual writing, forty is the preferred and correct spelling. While you may occasionally see fourty online or on social media, it remains a misspelling.
How can I remember the correct spelling?
A helpful memory trick is:
“Forty forgets the U.”
Although four contains a u, forty does not.
What is the ordinal form of forty?
The ordinal form is fortieth.
Examples:
- She celebrated her fortieth birthday.
- Today marks the company’s fortieth anniversary.
Is forty used in formal and academic writing?
Yes. Forty is the standard spelling used in books, newspapers, academic papers, business documents, and official publications. It is appropriate in every writing context.
Conclusion
If you’ve ever wondered whether to write forty or fourty, the answer is straightforward: forty is the only correct spelling. Although fourty may seem logical because it resembles the word four, it has never been accepted as the standard form in modern English.
The easiest way to remember the rule is with the phrase “Forty forgets the U.” Once you know this simple trick, you’ll be much less likely to make the mistake again.
Whenever you’re uncertain about spelling, consult a trusted dictionary and practice using the correct form in everyday writing. Small improvements like this can make your writing more polished, professional, and accurate.
If you’re interested in improving your English further, explore our other grammar and spelling guides to build confidence one word at a time.
Read more: Truely or Truly: Which Spelling Is Correct? (2026)
Rose Vault is an English language author who specializes in spelling comparisons, commonly confused words, and grammar. She creates clear, well-researched content that helps readers improve their writing and use English with confidence. Her goal is to make language learning simple, accurate, and accessible for everyone.
