Many English speakers pause when deciding between “who” and “whom.” The confusion is understandable because both words refer to people, and modern English often treats them differently from older grammar rules.
In everyday conversation, “who” is much more common. Still, “whom” remains important in formal writing, professional communication, and certain fixed phrases.
The good news is that the difference between who or whom becomes much easier once you understand one key idea: subject versus object.
Examples:
- “Who is calling?”
- “Whom did you invite?”
This guide will help you choose the natural and correct option with confidence.
Quick Answer
Use who when the person performs the action.
- “Who sent the email?”
- “Who wants coffee?”
Use whom when the person receives the action or follows a preposition.
- “Whom did you call?”
- “To whom should I address the package?”
A quick trick:
- If “he” works, use who.
- If “him” works, use whom.
Examples:
- “He called.” → “Who called?”
- “You called him.” → “Whom did you call?”
In casual American English, many people use “who” even where traditional grammar prefers “whom.”
Why People Confuse Them
The confusion exists because “who” and “whom” sound similar and refer to the same kind of person-based question or statement.
Modern spoken English also prefers simpler sentence structures. Many native speakers naturally say:
- “Who are you talking to?”
instead of:
- “To whom are you speaking?”
School grammar lessons often teach strict object-pronoun rules, while everyday conversation bends those rules regularly.
Another reason is that “whom” appears less often in casual speech today. That makes it feel formal, stiff, or uncertain for many writers.
Key Differences At A Glance
| Context | Best Choice | Why |
|---|---|---|
| Subject of a sentence | Who | Performs the action |
| Direct object | Whom | Receives the action |
| After a preposition in formal writing | Whom | Object of the preposition |
| Casual conversation | Who | Sounds more natural |
| Formal business writing | Whom | Fits formal tone |
| Fixed phrase: “To whom it may concern” | Whom | Standard formal expression |
Quick Comparison
- Who = subject pronoun
- Whom = object pronoun
- Who sounds more natural in conversation
- Whom appears more in formal writing
- Both refer to people
Meaning and Usage Difference
The real grammatical difference comes from sentence role.
“Who” works as a subject pronoun. The person performs the action.
Examples:
- “Who wrote this report?”
- “Who wants pizza?”
- “Who called earlier?”
“Whom” works as an object pronoun. The person receives the action.
Examples:
- “Whom did you invite?”
- “Whom are they interviewing?”
- “To whom did you send the contract?”
This difference also appears with prepositions.
Formal style:
- “With whom are you traveling?”
Modern conversational style:
- “Who are you traveling with?”
Both are widely understood. The second version simply sounds more natural in everyday American English.
Sentence restructuring can also help.
Example:
- “Whom did you meet?”
Reorder it:
- “You met him.”
Because “him” fits, “whom” is technically correct.
Tone, Context, and Formality
Tone matters a lot with “who” and “whom.”
In conversation, “who” usually sounds relaxed and natural.
- “Who are you texting?”
- “Who did you invite?”
In formal writing, “whom” may improve clarity and professionalism.
- “To whom should the application be submitted?”
- “The candidate whom we interviewed accepted the offer.”
Professional emails, academic papers, and legal writing still use “whom” more often than everyday speech.
At the same time, overusing “whom” can sound awkward.
Example:
- “Whom are you going with?”
This is grammatically possible, but many Americans would naturally say:
- “Who are you going with?”
The audience and setting should guide your choice.
Which One Should You Use?
For everyday speech, “who” is usually the safest and most natural option.
Examples:
- “Who are you meeting after work?”
- “Who did you text?”
Use “whom” when:
- writing formally
- following a preposition in careful writing
- editing academic or business documents
- using fixed expressions
Examples:
- “To whom it may concern”
- “For whom was the reservation made?”
A practical approach:
- Find out whether the person performs or receives the action.
- Try the he/him test.
- Consider the tone of the situation.
Casual text message:
- “Who are you talking to?”
Formal workplace email:
- “To whom should I send the updated proposal?”
When One Choice Sounds Wrong
Some sentences become clearly awkward when the wrong form appears.
Incorrect:
- “Whom is calling?”
Why it sounds wrong:
The person performs the action, so the subject form is needed.
Correct:
- “Who is calling?”
Another example:
- “Whom wants another slice of pizza?”
This sounds unnatural because “whom” cannot normally act as the subject.
Overformal phrasing can also sound stiff.
Awkward in casual conversation:
- “Whom are you hanging out with tonight?”
More natural:
- “Who are you hanging out with tonight?”
In formal writing, however, “whom” may still fit naturally after prepositions.
- “To whom was the message addressed?”
Common Mistakes (and Quick Fixes)
Mistake:
- “Can you tell me whom is coming?”
Quick fix:
- “Can you tell me who is coming?”
Mistake:
- “Who did you send the package to?” in highly formal writing
Formal revision:
- “To whom did you send the package?”
Mistake:
- Using “whom” everywhere to sound formal
Quick fix:
- Use “whom” only when it clearly functions as an object.
Mistake:
- Avoiding “whom” completely in formal writing
Quick fix:
- Keep “whom” in fixed formal expressions and careful professional writing.
Everyday Examples
Casual conversation:
- “Who left their jacket here?”
- “Who are you waiting for?”
Office communication:
- “Who approved the budget request?”
- “To whom should I forward this invoice?”
School writing:
- “The professor whom we interviewed teaches history.”
- “Who wrote the article summary?”
Phone call:
- “Who’s speaking?”
- “Whom would you like to speak with?”
Formal announcement:
- “To whom it may concern, your application has been received.”
Mini dialogue:
- “Who are you meeting downtown?”
- “The client whom our manager recommended.”
Another dialogue:
- “Who are you traveling with?”
- “A friend from college.”
Dictionary-Style Word Details
Verb
- Who: Not commonly used as a verb in standard English.
- Whom: Not used as a verb in standard English.
Noun
- Who: Occasionally appears in special noun-style expressions such as “a who’s who.”
- Whom: Not commonly used as a noun.
Synonyms
- Who: Closest plain alternatives depend on sentence structure and wording.
- Whom: Often replaceable with “who” in casual English, though tone becomes less formal.
Examples:
- Formal: “To whom did you speak?”
- Casual: “Who did you speak to?”
Example Sentences
- Who:
- “Who called during lunch?”
- “Who wants extra tickets?”
- “Who wrote the final report?”
- “Who are you meeting tonight?”
- Whom:
- “Whom did you invite to dinner?”
- “To whom should I send this email?”
- “The person whom we hired starts Monday.”
- “With whom are you traveling?”
Word History
- Who: Comes from Old English interrogative pronouns connected to grammatical case systems.
- Whom: Developed as the object-case form of “who” and gradually became less common in everyday speech over time.
Phrases Containing
- Who:
- “Who knows?”
- “Who cares?”
- “Who’s who”
- Whom:
- “To whom it may concern”
- “For whom the bell tolls”
FAQs
What is the difference between who and whom?
The main difference is grammatical role.
- Who is used as a subject.
- Whom is used as an object.
Examples:
- “Who called you?”
- “Whom did you call?”
When should you use whom?
Use whom when the person receives the action or follows a preposition.
Examples:
- “Whom are you meeting?”
- “To whom did you send the letter?”
Is “whom” outdated?
Not completely. “Whom” is less common in casual speech today, but it still appears in:
- formal writing
- business communication
- academic writing
- fixed expressions
Example:
- “To whom it may concern”
Can I say “Who did you talk to?”
Yes. That sentence is natural and widely accepted in modern English.
A more formal version would be:
- “To whom did you speak?”
What is the he/him trick for who and whom?
Replace the word with he or him.
- If he works, use who.
- If him works, use whom.
Examples:
- “___ called?” → “He called.” → Who called?
- “You invited ___?” → “You invited him.” → Whom did you invite?
Is “To whom it may concern” still correct?
Yes. It is still a standard and correct formal phrase in professional writing.
Why does “whom” sound formal?
Modern American English usually prefers who in conversation. Because of that, whom can sound:
- formal
- academic
- careful
- old-fashioned in casual speech
Can “who” replace “whom” in casual conversation?
Often, yes.
Examples:
- Casual: “Who are you going with?”
- Formal: “With whom are you going?”
The first version sounds more natural in everyday speech.
Is using “whom” incorrectly worse than using “who”?
Usually, yes. Incorrectly forcing “whom” into a sentence often sounds awkward.
Incorrect:
- “Whom is calling?”
Correct:
- “Who is calling?”
Can “whom” appear at the end of a sentence?
It can, but it often sounds stiff in modern conversation.
Example:
- “Whom are you speaking with?”
Many speakers would naturally say:
- “Who are you speaking with?”
Why do native speakers often avoid “whom”?
Over time, conversational English became less strict about object pronouns. Many people now prefer simpler, more natural phrasing with who.
Which should learners use most often?
For everyday English, who is usually the safer and more natural choice.
Use whom mainly in:
- formal writing
- edited documents
- professional communication
- fixed expressions
Is “Who are you looking for?” wrong?
No. It is completely normal in modern English.
A more formal version is:
- “Whom are you looking for?”
Why is “Whom are you going with?” awkward?
It is grammatically possible, but many native speakers prefer the more conversational version:
- “Who are you going with?”
The difference is mostly about tone and naturalness.
Conclusion
The difference between who or whom comes down to grammatical role and modern usage style.
Use who when the person performs the action:
- “Who called?”
Use whom when the person receives the action or follows a preposition in formal writing:
- “Whom did you call?”
Modern spoken English often prefers “who,” even where older grammar rules might expect “whom.” The best choice depends on tone, audience, and clarity.
Once you understand the subject-versus-object difference, choosing between them becomes much easier.
