Choosing between anytime and any time is one of the most frequent grammar dilemmas in everyday writing. Whether you are drafting a quick email to a colleague, writing an academic paper, or setting up a business agreement, deciding whether to merge these two words into a single compound can cause unexpected hesitation.
Both forms sound identical when spoken out loud, and both deal with the concept of time or availability. However, in written English, they serve different grammatical roles. Using the wrong form will not always ruin your sentence, but placing the single-word form after a preposition—such as writing “at anytime”—creates a noticeable error that catches the eye of editors, hiring managers, and attentive readers.
Understanding the difference comes down to recognizing how the word functions in your sentence. One form acts strictly as an adverb, while the two-word version functions as a noun phrase or an adverbial phrase. This guide breaks down the precise rules, structural tests, and style guidelines for anytime vs any time so you can write with complete confidence every time.
Quick Answer
The difference between anytime and any time depends on how the term functions in your sentence and whether a preposition comes before it:
- Anytime (one word) is an adverb that means “whenever” or “at whatever time.” You can use it whenever you can substitute the word “whenever.”
- Any time (two words) is a noun phrase or an adverbial phrase. It must be used whenever it follows a preposition (like at, for, in, or during) or when referring to a quantity or amount of time.
Anytime = Adverb ("whenever") -> "Call me anytime."
Any time = Preposition Target / Noun -> "Call me at any time." / "Do you have any time?"
The absolute rule to memorize is simple: Never write “at anytime.” If the word follows a preposition, it must always be split into two words: at any time.
If you are ever unsure which one to choose, pick any time (two words). The two-word version is grammatically correct in virtually every context, whereas the single-word version has strict grammatical limits.
Why People Confuse Them
The confusion between anytime and any time stems from how English compound words evolve over time, combined with the fact that both variations sound identical in speech.
1. Zero Acoustic Difference
When spoken in natural conversation, “anytime” and “any time” sound exactly the same. Because our brains process spoken language long before we learn formal writing rules, writers naturally treat the two forms as completely interchangeable variants of the same spoken phrase.
2. The Evolution of Compound Words
English frequently merges two-word phrases into single compound words over time as they become common adverbs or conjunctions. Words like cannot, into, everyday, and someday underwent this exact transition. The single-word compound anytime gained widespread popularity in American English during the 20th century as a casual shorthand for “at any time.” However, unlike words that fully replaced their separate components, “anytime” only partially replaced “any time,” creating a dual-system rule that trips up writers.
3. Overlapping Adverbial Meanings
Because both forms can mean “at whatever time” in casual sentence structures (“Call me anytime” versus “Call me any time”), many writers assume the single-word form can step in anywhere time is mentioned. They do not realize that adding a simple preposition in front of the term fundamentally changes the grammatical requirements of the sentence.
Key Differences At A Glance
Use this contextual reference table to quickly identify which form fits your sentence structure:
| Context | Best Choice | Why |
| Sentence means “whenever” (no preposition) | anytime | Functions as a standalone adverb modifying the verb |
| Preceded by a preposition (at, for, in, during) | any time | Prepositions must modify noun phrases, requiring two words |
| Asking about or referring to an amount/duration of time | any time | “Time” acts as a standalone noun modified by “any” |
| Formal, legal, or academic publications | any time | Traditional style guides favor the two-word form for consistency |
| Ending a casual email or friendly message | anytime | Standard, conversational shorthand for “whenever you like” |
Meaning and Usage Difference
To master anytime vs any time, it helps to examine how each term behaves grammatically inside a sentence.
Mechanics of “Anytime” (One Word)
The single word anytime functions exclusively as an adverb. Its primary role is to modify verbs by describing when an action occurs. It is an exact synonym for “whenever” or “at whatever time.”
- “Feel free to call me anytime.” (Modifies the verb “call”)
- “You can drop by the office anytime tomorrow.” (Modifies the verb phrase “drop by”)
- “Anytime you are ready, we can leave.” (Functions as a conjunction/adverb launching a clause)
Because anytime is purely an adverb, it cannot act as a noun. It cannot hold an amount of time, nor can it serve as the object of a preposition.
Mechanics of “Any Time” (Two Words)
The two-word phrase any time consists of the determiner/adjective any paired with the noun time. Together, they function either as a noun phrase or an adverbial phrase.
Role 1: Object of a Preposition
When you place a preposition such as at, for, in, by, or during before the phrase, English grammar requires a noun or noun phrase to complete the prepositional phrase. An adverb cannot fulfill this role.
- “You may reach out to us at any time.” (Correct: “at” + noun phrase “any time”)
- “We do not expect delays for any time in the near future.” (Correct: “for” + noun phrase “any time”)
Role 2: Referring to an Amount of Time
When “time” represents a measurable duration, quantity, or available slot, it acts as a true noun. In these sentences, combining the words into “anytime” is completely incorrect.
- “Do you have any time to review this proposal today?” (Meaning: Do you have an amount of time?)
- “I haven’t had any time to relax this week.” (Meaning: I haven’t had a quantity of time.)
Structural Comparison
| Feature | anytime | any time |
| Part of Speech | Adverb | Noun phrase or Adverbial phrase |
| Core Meaning | Whenever; at whatever time | An amount of time; at any given moment |
| Can follow a preposition? | No (Never “at anytime”) | Yes (“at any time”, “for any time”) |
| Can refer to duration/amount? | No | Yes (“I don’t have any time”) |
| Passes the “Whenever” Test? | Yes | Yes (in adverbial contexts) |
| Formality Profile | Casual, standard conversational | Universal (casual, formal, academic, legal) |
Tone, Context, and Formality
While both terms are fully recognized in modern American English, their acceptance varies depending on style guides, publication types, and context.
Style Guide Standards
- Associated Press (AP Style): AP style accepts anytime (one word) as an adverb meaning “whenever.” However, AP strictly mandates any time (two words) when used with a preposition like at.
- The Chicago Manual of Style (CMOS): CMOS allows “anytime” as an adverb in general prose, but leans heavily toward “any time” (two words) in formal, academic, and technical editing—especially to maintain consistency across prepositional and non-prepositional uses.
- Garner’s Modern English Usage: Bryan Garner notes that while “anytime” is standard in modern American English, “any time” is always safe in every single context.
Professional and Workplace Email
In everyday business communication, ending a message with “Feel free to reach out anytime” is completely standard and welcoming. It conveys a modern, approachable tone. However, in formal contracts, compliance documents, policy manuals, or legal disclaimers, the two-word phrasing (“at any time”) is standard practice:
- Casual Email: “Let me know if you want to jump on a call anytime this afternoon.”
- Legal Contract: “Either party may terminate this agreement at any time with thirty days written notice.”
Which One Should You Use?
When drafting your text, rely on two instant tests to determine whether you need one word or two.
Test 1: The “Whenever” Test
Try replacing the phrase with the word whenever.
- Sentence: “Call me [anytime / any time].”
- Test: “Call me whenever.”
- Result: Makes complete sense! You can safely use anytime (one word) or any time (two words).
- Sentence: “Do you have [anytime / any time] to talk?”
- Test: “Do you have whenever to talk?”
- Result: Makes no sense. You MUST use any time (two words).
Test 2: The Preposition Check
Look at the word immediately preceding the term. Is it a preposition like at, for, in, from, or during?
- If YES: Use any time (two words).”Available at any time.” (Never “at anytime”)
- If NO: Check if it means “whenever.” If it does, you may use anytime (one word).”Available anytime.”
When One Choice Sounds Wrong
Placing the wrong form in a sentence creates awkward phrasing that disrupts reading flow. Review these examples to train your eye to spot errors instantly:
Preposition Contamination
Incorrect: “Please contact customer support at anytime.”
Why it fails: The preposition “at” cannot modify the adverb “anytime.”
Correct: “Please contact customer support at any time.”
Correct: “Please contact customer support anytime.”
Noun Quantity Distortion
Incorrect: “I don’t have anytime to finish this report before 5 PM.”
Why it fails: “Anytime” cannot represent a noun quantity or duration of time.
Correct: “I don’t have any time to finish this report before 5 PM.”
Clunky Formal Disconnect
Incorrect: “The tenant reserves the right to inspect the property at anytime during business hours.”
Why it fails: Formal legal or policy prose requires precise noun-phrase structures following prepositions.
Correct: “The tenant reserves the right to inspect the property at any time during business hours.”
Common Mistakes (and Quick Fixes)
Here are direct before-and-after fixes for the most frequent word-choice errors:
- Typo: Writing “at anytime” in business emails
- Wrong: “Feel free to stop by my desk at anytime.”
- Fix: “Feel free to stop by my desk at any time.” (or remove “at” completely: “stop by my desk anytime“)
- Typo: Using one word when asking for availability
- Wrong: “Do you have anytime this week for a quick coffee?”
- Fix: “Do you have any time this week for a quick coffee?”
- Typo: Combining words after “for”
- Wrong: “We haven’t seen results like this for anytime in recent history.”
- Fix: “We haven’t seen results like this for any time in recent history.”
- Typo: Overcorrecting casual sign-offs
- Wrong: “Thanks for the help! Any-time!”
- Fix: “Thanks for the help! Anytime!“
Everyday Examples
Here is how anytime and any time appear in realistic, modern American writing across workplace, academic, and casual settings:
Workplace Communication
- “You can update your benefit elections anytime during the open enrollment period.”
- “Please note that server maintenance may occur at any time after midnight.”
- “Does the team have any time allocated for user testing before the sprint ends?”
Academic & Formal Writing
- “Participants were permitted to withdraw from the study at any time without penalty.”
- “The research team found no evidence that the historical event occurred at any time during the nineteenth century.”
- “Authors may submit their manuscripts anytime prior to the December deadline.”
Casual Conversation & Messages
- “Thanks for driving me to the airport—I really appreciate it! Anytime!“
- “Let me know anytime you want to catch up over lunch.”
- “I would love to help, but I just don’t have any time on my schedule today.”
Dictionary-Style Word Details
Verb
- anytime: Does not function as a verb.
- any time: Does not function as a verb.
Noun
- anytime: Does not function as a noun. It cannot be used as the subject or object of a sentence, nor can it follow a preposition.
- any time: Functions as a noun phrase consisting of the determiner any and the noun time. It frequently serves as the object of a preposition (e.g., “at any time”) or describes a duration/quantity of time (e.g., “I need some time, if you have any time to spare”).
Synonyms
- anytime:
- Exact Synonyms: Whenever, at whatever time.
- Closest Plain Alternatives: Constantly, continuously, whenever you like.
- any time:
- Exact Synonyms (in prepositional/noun contexts): Any given moment, any duration, any available interval.
- Closest Plain Alternatives: Any period, any moment.
Example Sentences
- anytime:
- “Call me anytime you need assistance with your project.”
- “You are welcome to visit our showroom anytime during normal business hours.”
- “She is ready to leave anytime you are.”
- any time:
- “You may pause the video at any time to take notes.”
- “Do you have any time left on your parking meter?”
- “He refused to confirm whether he had lived in California at any time in his life.”
Word History
- anytime: The single-word compound anytime evolved in American English during the late 19th and early 20th centuries. It was created through compounding, a natural process where two frequently paired words (any + time) collapse into a single adverbial unit, mirroring words like someday or meanwhile. While heavily adopted in North American prose, traditional style guides initially resisted it, enforcing two words in all contexts.
- any time: The two-word phrase is the original historical form in English literature, combining the Old English determiner ænig (any) with the Old English noun tīma (time). Historically, it covered both noun phrase duties and adverbial functions across British and American English long before the compound form gained acceptance.
Phrases Containing
- anytime:
- “Anytime, anywhere” (referring to total flexibility of time and location)
- “Anytime soon” (referring to an expected near-future event)
- “You’re welcome / Anytime!” (used as a casual response to thanks)
- any time:
- “At any time” (prepositional phrase meaning without restriction or warning)
- “For any length of time” (referring to duration)
- “In any time at all” (referring to rapid speed or efficiency)
FAQ
Is “at anytime” ever correct?
No. Writing “at anytime” as one word is always grammatically incorrect in standard English. Because “at” is a preposition, it requires a noun phrase after it. You must always write at any time as two separate words.
Can I end an email with “anytime”?
Yes. Closing an email with a warm statement like “Feel free to reach out anytime” is completely standard, professional, and friendly. Just ensure you do not put “at” in front of it unless you split it into two words (“at any time”).
Is “anytime” one word in AP Style?
Yes. AP style allows “anytime” as a single-word adverb meaning “whenever.” However, AP style strictly requires two words (“any time”) when used after a preposition like at.
Is “any time” always two words in British English?
Historically, British English has been much slower to adopt the single-word compound “anytime” than American English. While “anytime” is increasingly common in modern UK casual writing, formal British style guides still heavily favor “any time” (two words) for all usages.
How do I respond when someone says “Thank you”?
You can casually reply with “Anytime!” as a single word. In this context, it functions as an informal contraction of “You are welcome to ask for my help anytime.”
Conclusion
Distinguishing between anytime and any time is simple once you master the underlying sentence structure. Use anytime as a single-word adverb whenever you can easily swap it for “whenever.” Switch to any time as two words whenever the term follows a preposition like at, or when you are describing a measurable amount of time.
If you ever find yourself hesitating during a project or email draft, remember that any time as two words is valid across almost every sentence structure in the English language. Keep the preposition rule in mind, avoid “at anytime,” and your writing will remain polished, clear, and professional.
