Space or no space? It is a subtle difference that trips up even native English speakers. When writing an email or a formal document, knowing when to press that spacebar changes the grammatical function of your sentence. While they sound exactly the same when spoken, anytime and any time have distinct roles in writing.
You cannot always use them interchangeably. One acts as an adverb describing when something happens, while the other talks about the resource of time itself.
The Main Difference
1. Anytime (Adverb)
This is an adverb. It modifies a verb and answers the question “When?”
Synonyms: Whenever, on any occasion.
Example: “The bus could arrive anytime now.”
2. Any time (Noun Phrase)
This is an adjective (any) modifying a noun (time). It refers to a specific span or amount of time.
Synonyms: Any amount of time.
Example: “I don’t have any time to waste.”
The “Whenever” Replacement Trick
Unsure which one to write? There is a simple substitution test that works nearly 100% of the time.
If the sentence still makes sense, use Anytime (one word).
If it sounds wrong, you probably need Any time (two words).
Let’s test it:
- Sentence A: “Stop by my office [anytime / any time].”
- Test: “Stop by my office whenever.” (✅ Makes sense)
- Result: Use Anytime.
- Sentence B: “Do you have [anytime / any time] to review this?”
- Test: “Do you have whenever to review this?” (❌ Nonsense)
- Result: Use Any time.
When to Always Use Two Words
There is one specific grammatical rule where you must always separate the words. If you use the preposition “at”, you are forced to use the two-word version.
Rule: Never write “at anytime.” The correct form is always “at any time.”
In this structure, “at” is a preposition that requires a noun object. “Time” serves as that noun. “Anytime” is an adverb, and prepositions cannot be followed immediately by an adverb in this context.
❌ Incorrect
“The contract can be cancelled at anytime.”
✅ Correct
“The contract can be cancelled at any time.”
Comparison Cheat Sheet
Use this table for a quick check while writing your next email or essay.
| Word | Part of Speech | Meaning | Correct Usage Example |
|---|---|---|---|
| Anytime | Adverb | Whenever; at any moment | “We can leave anytime you want.” |
| Any time | Noun Phrase | An amount of time | “I don’t have any time left.” |
| At any time | Prepositional Phrase | Formal “whenever” | “Parking is prohibited at any time.” |
Real-World Examples
Seeing these words in context helps solidify the rule. Notice how the two-word version often discusses duration or possession of time.
Using “Anytime” (One Word)
- “You are welcome to visit anytime.”
- “Anytime is fine with me.” (Informal usage acting as a noun implies “any time slot”)
- “I haven’t seen him anytime recently.”
Using “Any time” (Two Words)
- “Is there any time to grab a coffee?”
- “He didn’t spend any time on his homework.”
- “You can return the item at any time within 30 days.”
Note: In formal writing (academic papers, legal contracts), the two-word phrase “at any time” is preferred over the casual adverb “anytime.”
You now have the tools to spot the difference. If you are describing an amount of minutes or hours, or if the word “at” comes first, keep them separated. If you just mean “whenever,” combine them into one.
