Forty or Fourty: The Correct Spelling, Meaning, and Usage Explained

Quick Answer
Forty is the correct spelling of the number 40. Fourty is a common spelling mistake and should not be used in standard English.

The spelling of forty can feel confusing because the number four contains a u. That naturally makes people wonder whether 40 should be written as fourty.

However, English does not follow that pattern here.

The correct spelling is forty, without the letter u. The incorrect form fourty is easy to understand because it looks connected to four, but it is not the standard spelling of the number.

You will need forty when writing ages, prices, measurements, quantities, scores, dates, and many other types of information. Once you remember that the u disappears, this spelling becomes much easier.

What Does Forty Mean?

Forty is the number 40.

It comes after thirty-nine and before forty-one.

For example:

• I have forty dollars.
• She is forty years old.
• Forty students joined the class.
• We waited for forty minutes.
• The building has forty rooms.

The word forty tells us the quantity of something.

It can appear before a noun or stand alone when the meaning is already clear.

What Does Fourty Mean?

Fourty is an incorrect spelling of forty in modern standard English.

People often write it because they connect the word with four.

For example, someone may think:

four + ty = fourty

That looks logical, but it is not the accepted spelling.

The correct form is:

forty

Not:

fourty

So if you are writing the number 40, always choose forty.

Forty or Fourty: Which Is Correct?

The answer is simple:

Forty is correct.

Fourty is incorrect.

This is not a difference between American and British spelling. English uses forty as the standard spelling of 40.

For example:

She bought forty books.

Correct.

She bought fourty books.

Incorrect.

The same rule applies no matter where you are using standard English.

Why Is Forty Spelled Without the U?

The confusion comes from the relationship between four and forty.

The number four is spelled:

four

The number fourteen is:

fourteen

The ordinal form is:

fourth

So it seems reasonable to expect:

fourty

But English spelling does not always follow a perfectly predictable pattern.

Over time, the spelling of the number 40 developed into forty. The modern word no longer keeps the u found in four.

This is simply one of those English spellings that needs to be remembered.

Forty in Everyday English

You will see forty in many normal situations.

For example:

I waited forty minutes for the bus.

The store has forty employees.

She saved forty dollars.

He turned forty last year.

About forty people attended the event.

In each sentence, forty tells us the number or amount.

The word is common in speech and writing, so learning its spelling is useful.

Forty for Age

One of the most common uses of forty is when talking about someone’s age.

Examples:

• She is forty years old.
• He turned forty last month.
• My father will be forty next year.
• She celebrated her fortieth birthday.
• He looks younger than forty.

A common mistake is:

She is fourty years old.

The correct sentence is:

She is forty years old.

Forty for Money

Use forty when writing an amount of money in words.

Examples:

• The shirt costs forty dollars.
• I paid forty dollars for the book.
• She gave me forty dollars.
• The ticket costs forty dollars.
• He saved forty dollars this week.

Do not write:

fourty dollars

Write:

forty dollars

The same rule applies to other currencies.

For example:

• forty pounds
• forty euros
• forty dollars
• forty cents

Forty for Time

Forty is also common when talking about time.

Examples:

• The trip took forty minutes.
• I waited forty minutes.
• The class lasted forty minutes.
• We have forty minutes left.
• She walked for forty minutes.

A useful pattern is:

forty minutes

not:

fourty minutes

Forty for Quantities

You can use forty before almost any countable noun when the quantity is 40.

Examples:

• forty students
• forty books
• forty cars
• forty houses
• forty questions
• forty tickets
• forty employees
• forty chairs

For example:

The teacher gave the students forty questions.

The spelling remains forty every time.

Forty in Measurements

The word also appears with measurements.

Examples:

• forty miles
• forty inches
• forty pounds
• forty kilograms
• forty degrees
• forty feet
• forty meters

For example:

The road is forty miles long.

Or:

The package weighs forty pounds.

The number remains forty regardless of the measurement that follows it.

Forty-One Through Forty-Nine

The same spelling continues when 40 is combined with another number.

Examples include:

• forty-one
• forty-two
• forty-three
• forty-four
• forty-five
• forty-six
• forty-seven
• forty-eight
• forty-nine

Notice that forty still has no u.

For example:

She has forty-five books.

Not:

She has fourty-five books.

When writing these compound numbers as words, use a hyphen between the tens number and the ones number.

Forty or Fourty Five?

This is another common spelling question.

The correct form is:

forty-five

The incorrect form is:

fourty-five

For example:

The team scored forty-five points.

The package contains forty-five items.

She waited forty-five minutes.

The first part remains forty, without the u.

Forty or Fourty-One?

The correct spelling is:

forty-one

Not:

fourty-one

For example:

He is forty-one years old.

Forty-one students attended the meeting.

The store sold forty-one tickets.

The spelling of forty does not change when another number follows it.

Forty and Fortieth

It is also useful to understand forty and fortieth.

Forty tells us a quantity.

Forty people attended.

Fortieth tells us position in a sequence.

She finished fortieth in the race.

The correct spelling is fortieth, not fourtieth.

Notice that the u is missing from both forms.

This gives you a useful memory pattern:

40 = forty

40th = fortieth

Common Mistakes With Forty

The biggest mistake is adding the u from four.

Incorrect:

fourty

Correct:

forty

Another common mistake is writing:

fourty-one

Instead, write:

forty-one

You may also see:

fourty-five

The correct form is:

forty-five

These mistakes are easy to fix once you remember that 40 is an exception to the spelling pattern people naturally expect.

Why Do People Write Fourty?

The mistake usually happens because of visual association.

When people see:

four

they remember the spelling of the number 4.

Then they see:

forty

and expect the word to keep the same letters.

That produces:

fourty

The problem is that English number words do not always develop in a way that feels perfectly logical.

Another reason is that several related words keep the u.

For example:

• four
• fourteen
• fourth
• four hundred

Because these words retain the letter, fourty can look correct at first glance.

It is not.

The standard spelling is forty.

Forty in Formal Writing

It is especially important to use forty correctly in formal writing.

You might use the word in:

• school assignments
• business documents
• reports
• applications
• emails
• contracts
• financial documents
• professional communication

For example:

The company has forty employees.

This is correct.

Writing fourty instead can make the document look poorly edited.

The mistake does not change the meaning, but it does make the spelling incorrect.

Forty in Academic Writing

Academic writing often includes numbers, statistics, measurements, and quantities.

For example:

Forty students participated in the study.

The experiment lasted forty minutes.

The survey received responses from forty participants.

Whenever 40 is written as a word, use forty.

The spelling does not change because the sentence is academic.

Forty in Business Writing

Businesses use the number 40 in many contexts.

For example:

The company hired forty new employees.

The meeting lasted forty minutes.

The store received forty orders.

The customer paid forty dollars.

Each example uses forty correctly.

The same spelling works in invoices, emails, reports, and other business communication.

Forty in a Sentence

Here are some natural examples:

I have forty dollars in my wallet.

The class has forty students.

We drove forty miles.

She waited forty minutes.

He turned forty this year.

The hotel has forty rooms.

The company employs forty people.

They sold forty tickets.

The box weighs forty pounds.

The race is forty miles long.

Every sentence uses the same correct spelling: forty.

Incorrect Examples With Fourty

Here are some examples that contain the common mistake:

I have fourty dollars.

She is fourty years old.

We waited fourty minutes.

The class has fourty students.

He drove fourty miles.

All of these should use forty instead.

Correct versions:

I have forty dollars.

She is forty years old.

We waited forty minutes.

The class has forty students.

He drove forty miles.

Forty vs Fourty Comparison

This comparison makes the main rule easy to see.

A Simple Memory Trick

There is one very easy way to remember the spelling.

Think:

FOUR loses U when it becomes FORTY.

So:

four → forty

Not:

four → fourty

You can also connect it with the ordinal form:

forty → fortieth

Both forms leave the u behind.

If you remember that one small rule, you will avoid most spelling mistakes involving 40.

Practice Questions

Try correcting these sentences.

1. She is fourty years old.

Correct answer:

She is forty years old.

2. The trip lasted fourty minutes.

Correct answer:

The trip lasted forty minutes.

3. He paid fourty dollars.

Correct answer:

He paid forty dollars.

4. The school has fourty classrooms.

Correct answer:

The school has forty classrooms.

5. We invited fourty people.

Correct answer:

We invited forty people.

The answer is the same in every case: remove the u.

Quick Practice: Choose the Correct Word

Choose forty or fourty.

1. I have ______ books.

Answer: forty

2. She turned ______ last year.

Answer: forty

3. The package weighs ______ pounds.

Answer: forty

4. He waited ______ minutes.

Answer: forty

5. The company has ______ employees.

Answer: forty

If you answered forty every time, you got them all right.

Forty or Fourty in Different Types of English

Unlike some English spelling differences, this is not a case where one version belongs to one country and the other version belongs to another.

The standard spelling is forty.

You should not think of fourty as a British version of the word.

For example, British English uses:

forty pounds

American English uses:

forty dollars

The currency changes, but the spelling of the number remains forty.

What About 40?

When you use the numerical form, there is no spelling issue:

40

The confusion starts when you write the number in words.

So:

40 = forty

Not:

40 = fourty

This is useful when switching between numbers and words in writing.

What About 40th?

The ordinal form of 40 is:

40th = fortieth

For example:

She finished in fortieth place.

Not:

She finished in fourtieth place.

The correct spelling removes the u.

Final Tips

Remember these simple rules:

• Forty is the correct spelling.
• Fourty is incorrect.
• Forty means the number 40.
• The word four contains a u, but forty does not.
• Write forty-one, not fourty-one.
• Write forty-five, not fourty-five.
• The ordinal form is fortieth.
• The correct spelling is the same across standard English varieties.
• Use forty in formal and informal writing.
• When in doubt, remember: 40 = forty.

FAQs

Is forty or fourty correct?

Forty is correct. Fourty is a common misspelling of the number 40 and should not be used in standard English.

Why is forty spelled without a u?

The spelling of forty developed differently from the spelling of four. Although the words are related, English does not keep the u in the modern spelling of forty.

Is fourty ever correct?

In modern standard English, fourty is not the accepted spelling of 40. The correct form is forty.

Is it forty-five or fourty-five?

The correct spelling is forty-five. The word forty never gains a u when it combines with another number.

How do you spell 40th?

The correct spelling is fortieth. It is the ordinal form of forty and also does not contain the letter u.

Conclusion

The correct spelling of the number 40 is forty, not fourty. The confusion is understandable because four contains a u, but that letter does not appear in forty.

The same rule continues in related forms. Write forty-one, forty-five, and fortieth. Never add the u simply because it appears in the word four.

The easiest rule to remember is simple:

40 = forty

Once you memorize that one spelling, you will no longer need to wonder whether forty or fourty is correct.

Emily Carter