Quick answer: “Who” is for the subject of a sentence — the one doing the action. “Whom” is for the object — the one receiving the action. “Who called you?” (who did the calling) vs. “Whom did you call?” (the object of the calling).
This is one of the most avoided rules in modern English — “whom” is disappearing from everyday speech, and many people just default to “who” everywhere. That’s fine for casual writing, but the distinction is still expected in formal writing, and knowing the trick below makes it effortless.
| Term | Meaning / When to use | Example sentence |
|---|---|---|
| Who | Subject pronoun — replaces “he/she/they” (the doer). | “Who is coming to the party?” |
| Whom | Object pronoun — replaces “him/her/them” (the receiver). | “To whom should I address this letter?” |
The He/Him Test
This is the trick that makes “who vs. whom” easy forever: mentally answer the question using “he” or “him.” If “he” fits, use “who.” If “him” fits, use “whom” (both end in -m, easy to remember). “Who called?” → “He called” → who. “Whom did you call?” → “You called him” → whom.
When to use Who
- “Who is responsible for this project?”
- “I don’t know who left this here.”
- “Who wants pizza tonight?”
When to use Whom
- “Whom did you speak with?”
- “To whom it may concern.”
- “The person whom I met yesterday was very kind.”
Common Mistakes and Exceptions
The most common mistake is overcorrecting — using “whom” to sound formal even when “who” is grammatically correct (e.g., “Whom is calling?” is wrong; it should be “Who is calling?” since “he is calling,” not “him is calling”). Another wrinkle: after a preposition (to, with, for, from), “whom” is almost always correct — “To whom,” “With whom,” “For whom” — because prepositions take objects.
In everyday spoken English, “whom” is increasingly optional except in these fixed, formal phrases. Using “who” throughout in casual conversation (“who did you call?”) is now widely accepted and rarely sounds wrong to a listener — the strict rule matters most in formal writing, legal documents, and edited prose.
Frequently Asked Questions
Is “whom” becoming obsolete?
A: In casual spoken English, largely yes — but it remains standard and expected in formal writing, so it’s worth knowing rather than avoiding entirely.
Is it “who” or “whom” shall I say is calling?
A: “Whom shall I say is calling” is the traditional formal phrasing, though “who” is now common and accepted in everyday use.
What’s the fastest way to never get this wrong again?
A: Memorize the he/him test above — it takes about two seconds to apply and resolves nearly every real-world case correctly.
