Anytime or Any Time: Grammar Rules Made Easy (2026Guide)

The tiny space between anytime and any time can create a surprisingly big grammar question. Both forms are common, both are correct in certain situations, and both can mean “at any time.” So, how do you know which one to use?

People often search for “anytime or any time” because the two forms look almost identical. The difference becomes important in emails, school assignments, professional writing, and everyday messages. In some sentences, anytime works best as an adverb. 

In others, any time works as a noun phrase, especially after a preposition such as at.

The good news is that the rule is easier than it first appears. In this guide, you will learn the difference between anytime and any time, where the forms came from, how American and British English use them, and which version is safest for formal writing. 

You will also see simple examples, common mistakes, usage patterns, and practical tips to help you choose the right form every time.

Anytime or Any Time – Quick Answer

Anytime and any time can both be correct, but they do not always work in the same grammatical position.

Anytime is usually an adverb meaning “at any time,” “whenever,” or “at an unspecified time.”

• You can call me anytime.
• Come and visit anytime.
• I do not expect the problem to disappear anytime soon.

Any time is usually a phrase made from the determiner any and the noun time.

• You can call me at any time.
• Do you have any time to help me?
• Any time after lunch is fine.

A useful test is to replace anytime with at any time or whenever. If the sentence still makes sense, anytime is often appropriate.

However, after at, use any time, not at anytime.

Form	Main use	Example
anytime	Adverb	Call me anytime.
any time	Noun phrase	Call me at any time.
any time	Time period or amount	I don’t have any time today.
anytime soon	Near future	Will it happen anytime soon?

Merriam-Webster describes anytime as an adverb meaning “at any time whatever,” while Cambridge lists any time as an alternative, particularly in British English.

The Origin of Anytime or Any Time

The expression comes from two basic English words: any and time.

Any developed from Old English forms related to the idea of “one,” “some,” or “a person or thing without restriction.” Time has much older Germanic roots and has been used in English for centuries to describe a period, moment, or occasion.

Over time, combinations such as any time became common phrases. English then began turning some frequently used word combinations into closed compounds. This process produced forms such as anytime, anywhere, anyhow, and anyway.

The history of anytime is especially interesting because dictionaries record it as an established word rather than a simple modern typo. Merriam-Webster gives 1822 as its first known use of anytime in the modern adverbial sense.

Dictionary.com records the form even earlier, listing its first recorded use as 1780–90.

The spelling difference exists because English allows both a closed compound and an open phrase in different grammatical roles.

For example:

• Call me anytime. > anytime acts as an adverb.
• Call me at any time. > any time is a noun phrase after the preposition at.
• I don’t have any time. > time is a noun modified by any.

Merriam-Webster also explains that anytime generally functions as an adverb, while any time can function as a noun phrase and can also have adverbial use.

So, the two forms are not simply a case of “one is right, and one is wrong.” Their grammatical roles help determine the best spelling.

British English vs American English Spelling

The biggest difference is not really spelling. It is usage preference.

American English commonly uses anytime as a one-word adverb:

You can contact me anytime.

British English traditionally favors any time in many of the same situations:

You can contact me any time.

Cambridge specifically lists anytime as an adverb and notes that British English also uses any time.

Oxford similarly lists any time as a British English form and notes anytime as a North American English form, while also recognizing its use in British English.

Comparison Table

Feature	American English	British English
Common adverb	anytime	any time
“Call me”	Call me anytime.	Call me any time.
“At” construction	at any time	at any time
“Soon” expression	anytime soon	any time soon is also used
Formal writing	Both may appear	any time is often a safe choice
Meaning	Generally the same	Generally the same

This difference does not mean American writers must always use anytime or British writers must always use any time. Modern English usage is flexible.

Oxford notes that anytime is especially associated with North American English, while Cambridge recognizes both forms.

Anytime or Any Time: Side-by-Side Comparison

Sentence	Correct?	Why?
Call me anytime.	✓	Adverb
Call me any time.	✓	Common alternative
Call me at any time.	✓	Noun phrase after at
Call me at anytime.	✗	Avoid this construction
I don’t have any time.	✓	Time is a noun
I don’t have anytime.	✗	Wrong grammatical form
Will you arrive anytime soon?	✓	Common adverbial use
Will you arrive any time soon?	✓	Also accepted

Which Spelling Should You Use?

The best choice depends on your audience and the type of writing you are doing.

For American English

Use anytime when it works as an adverb.

You can email me anytime.

This is natural and widely accepted in American English.

For British and Commonwealth English

Any time is often a safe choice, especially when writing for a British audience.

You can email me any time.

Cambridge and Oxford both recognize any time in British English.

For International or Formal Writing

When you want to avoid uncertainty, any time can be a useful choice, particularly in constructions such as:

Please contact us at any time.

It is also essential when time clearly functions as a noun:

I don’t have any time today.

Simple Professional Rule

Use this quick guide:

• anytime = usually an adverb
• any time = noun phrase or traditional open form
• at any time = safest after at
• at anytime = avoid

For global websites and professional content, consistency matters more than choosing one form in every sentence.

Common Mistakes with Anytime or Any Time

Writing “at anytime”

One of the most common mistakes is:

❌ Contact us at anytime.

A better version is:

✓ Contact us at any time.

The word at is a preposition, and any time works naturally as the noun phrase that follows it.

Writing “anytime” when “any time” is a noun

Consider:

❌ I don’t have anytime today.

The correct sentence is:

✓ I don’t have any time today.

Here, time is a noun. You are saying that you do not have any available time.

Assuming one form is always correct

It is incorrect to think that anytime is always right or any time is always right.

Compare:

You can visit anytime.

with:

You can visit at any time.

Both can express a similar idea, but their grammar is different.

Forgetting regional preferences

An American reader may find anytime very natural:

Call me anytime.

A British reader may be equally comfortable with:

Call me any time.

Neither automatically signals a serious grammar error.

Using “anytime” in every formal sentence

In formal writing, consider the structure of the sentence rather than forcing the one-word form.

Instead of:

Please contact us at anytime.

write:

Please contact us at any time.

That version is clear and standard.

Anytime or Any Time in Everyday Examples

Understanding real examples makes the difference much easier.

In Emails

Informal email:

Feel free to contact me anytime if you have questions.

Professional email:

Please contact me at any time if you require further information.

Both communicate the same general idea.

In News Writing

News articles often use anytime as an adverb, especially in phrases such as:

Officials do not expect the situation to change anytime soon.

Current dictionary examples show anytime soon in modern news and media usage.

On Social Media

Short online messages often favor the compact form:

You can message me anytime!

Come visit anytime!

This is natural because social media usually favors simple, conversational language.

In Formal Writing

Formal writing often uses the two-word form when time functions clearly as a noun:

The application may be submitted at any time before the deadline.

Another example:

Applicants may request assistance at any time.

In Everyday Conversation

You will hear both:

Come over anytime.

and:

Come over any time.

The meaning is usually clear from context.

A Useful Comparison

Context	Example
Email	Feel free to call me anytime.
Professional email	Please contact us at any time.
Social media	Message me anytime!
News	The weather could change anytime.
Formal writing	Applications may be submitted at any time.
Everyday speech	Come over any time.

Anytime or Any Time – Google Trends & Usage Data

Google Trends can help show search interest, but it should not be treated as a grammar authority. Search volume changes by country, season, language-learning interest, and user intent.

For anytime or any time, the important point is that both forms are actively used in English. The one-word form is strongly established in American English, while British English often retains the two-word form. Cambridge identifies anytime as an adverb and explicitly notes any time as a UK form.

Usage also differs by context. Casual online writing tends to favor shorter forms such as:

Contact me anytime.

Professional and formal writing often prefers structures such as:

Contact me at any time.

Search interest for grammar questions can also rise when students, writers, editors, and English learners encounter the two spellings in different sources.

Usage by Region

Region	Common tendency
United States	anytime is very common
Canada	Both forms are used
United Kingdom	any time is common
Australia	Both forms occur
New Zealand	Both forms occur
International English	Both are understood

Merriam-Webster describes anytime as an established adverb, while Oxford marks anytime as especially North American and any time as British English.

Anytime or Any Time: A Simple Rule to Remember

If you want one easy rule, remember this:

Use “anytime” when it means “whenever” or “at any time.”

Call me anytime.

Use “any time” when “time” is clearly a noun or follows “at.”

Call me at any time.

I don’t have any time today.

The “At” Test

When you see at, use:

at any time

not:

❌ at anytime

This simple test solves many common errors.

The “Whenever” Test

Try replacing anytime with whenever:

Call me anytime.

Call me whenever.

Both work, so anytime is a good choice.

FAQs:

Is “anytime” one word?

Yes. Anytime is a standard English word. It is mainly used as an adverb meaning “at any time” or “whenever.” Merriam-Webster lists it as an established adverb.

Is “any time” also correct?

Yes. Any time is correct when the two words function as a noun phrase or in many adverbial constructions. For example: “Call me at any time.”

Which is correct: “anytime” or “any time”?

Both can be correct. Use anytime mainly as an adverb, and any time when time functions as a noun or after a preposition such as at.

Is “at anytime” correct?

In standard usage, avoid at anytime. Write at any time instead.

✓ Contact me at any time.

Is “anytime soon” correct?

Yes. Anytime soon is a common expression, especially in American English.

We don’t expect the changes to happen anytime soon.

Oxford notes that anytime soon is especially associated with North American English.

Is “any time soon” also correct?

Yes. Any time soon is also used, particularly in British English and other varieties of English.

Do you think the package will arrive any time soon?

Which form is better for formal writing?

Use the form that matches the grammar of your sentence. At any time is especially clear in formal writing. If anytime is functioning correctly as an adverb, it is also an accepted word.

Conclusion:

The difference between anytime and any time is small but useful to understand. Both forms are correct, but they can play different grammatical roles.

Anytime is usually a one-word adverb meaning “at any time” or “whenever.” It is especially common in American English:

You can call me anytime.

Any time is often a noun phrase and is required after the preposition at:

You can call me at any time.

It is also common in British English, where the open form is often preferred. Cambridge and Oxford both recognize the regional difference, while Merriam-Webster confirms that anytime is a standard English adverb.

For everyday writing, focus on the grammar rather than memorizing a single spelling. If you can replace anytime with whenever, the one-word form will often work. If time is clearly a noun or follows at, choose any time.

Once you understand this simple distinction, choosing between anytime or any time becomes much easier.

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