Have you ever written the number 40 and wondered if it should be spelled fourty or forty? This is a common spelling mistake because the word four is spelled with a u, so it seems logical that fourty should be correct. However, standard English uses a different spelling.
The correct spelling is forty. The form fourty is incorrect in standard English.
This unusual spelling can confuse English learners because numbers such as four, fourteen, and fourth keep the u, while forty does not.
Knowing this small spelling rule is useful when writing essays, reports, emails, checks, dates, prices, and other formal documents.
In this guide, you’ll learn why forty is correct, where the spelling comes from, how it is used in British and American English, common mistakes, and practical examples.
By the end, you’ll know exactly when to use forty and why fourty should be avoided.
Fourty or Forty 🙂 Quick Answer
The correct spelling is:
- Forty ✅ = Correct
- Fourty ❌ = Incorrect
Examples
- She is forty years old.
- The book costs forty dollars.
- There were forty students in the room.
- He ran forty miles.
Quick Tip
Remember: four = 4, but forty = 40. The u disappears in forty.
The Origin of Fourty or Forty
The spelling forty comes from Old English forms related to the number four, but its spelling changed over time.
The modern spelling does not directly follow the spelling of four. Historical changes in English produced forty as the standard form.
This is why English has:
- four
- fourteen
- fourth
- forty
The spelling may look inconsistent, but forty has been the standard form for centuries.
British English vs American English Spelling
Unlike some spelling differences, forty is spelled the same way in British and American English.
Comparison Table
| Feature | British English | American English |
| Correct spelling | Forty | Forty |
| Incorrect spelling | Fourty | Fourty |
| Number | 40 | 40 |
| Formal writing | Forty | Forty |
Examples
British English:
There were forty people at the event.
American English:
There were forty people at the event.
Both use forty.
Which Spelling Should You Use?
Always use forty when spelling the number 40.
Use “Forty”
- forty students
- forty minutes
- forty dollars
- forty years
- forty percent
Avoid “Fourty”
❌ Fourty people attended.
✅ Forty people attended.
There is no standard English situation where fourty should replace forty.
Common Mistakes with Fourty or Forty
Adding the “U”
❌ Fourty
✅ Forty
The most common mistake is assuming four must keep its u when it becomes forty.
Confusing Forty With Fourteen
These words represent different numbers:
- fourteen = 14
- forty = 40
Example:
I have fourteen books.
I have forty books.
Confusing Forty With Fourth
These are also different:
- forty = 40
- fourth = 4th
Example:
She is forty years old.
She came in fourth place.
Fourty or Forty in Everyday Examples
The meeting will begin in forty minutes.
News
More than forty people attended the event.
Social Media
I can’t believe I just turned forty!
Formal Writing
The company employed approximately forty workers during the first year.
Fourty or Forty 🙂 Google Trends & Usage Data
The phrase “fourty or forty” is commonly searched because fourty looks like a logical spelling based on the word four.
People search for this spelling when:
- Writing numbers in words
- Completing school assignments
- Filling out official documents
- Writing checks or financial amounts
- Learning English spelling
- Proofreading professional content
Usage Comparison
| Spelling | Standard English? | Usage |
| Forty | ✅ Yes | Standard |
| Fourty | ❌ No | Common spelling mistake |
Comparison Table
| Number | Correct Spelling | Incorrect Spelling |
| 4 | Four | — |
| 14 | Fourteen | — |
| 40 | Forty | Fourty |
| 4th | Fourth | — |
FAQs
Is fourty or forty correct?
Forty is correct. Fourty is a misspelling.
Why is forty not spelled fourty?
The spelling developed historically and became standardized as forty. English does not always preserve the spelling of the original number when forming related words.
Is forty spelled differently in British English?
No. Forty is the standard spelling in both British and American English.
Is fourty ever correct?
No. Fourty is not the standard spelling of the number 40.
How do you spell 40?
The correct spelling is forty.
Is forty the same as four?
No. Four is 4, while forty is 40.
How do I remember the spelling of forty?
Remember this simple rule: four has a U, but forty does not.
Conclusion
The correct spelling of the number 40 is forty, not fourty. Although fourty may seem logical because the number four contains a u, English spelling does not always work in a perfectly predictable way.
The standard form has been forty for centuries, and it is used in both British and American English.
A simple way to remember it is: four = 4, but forty = 40. The u disappears when you spell the larger number.
if you’re writing an email, school assignment, business report, price, age, or formal document, always use forty.
Once you remember this small spelling difference, you can avoid one of the most common number-spelling mistakes in English.
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I’m Orin Blake, a writer with a passion for making English grammar simple, practical, and easy to understand. I enjoy breaking down confusing words, spelling differences, and everyday language questions into clear, reader-friendly guides. My goal is to help students, professionals, and curious learners write with greater confidence and accuracy.
