You’re typing a message, and you pause. Should it be “what kind of car” or “what kinds of car”? You know both sound familiar, but only one fits the sentence you’re writing.
Get it wrong in an email or a job application, and it can look like a careless mistake. The good news is that what kind of vs what kinds of comes down to one simple rule you can learn in under a minute.
Quick Answer
Use “what kind of” when asking about one type or category, paired with a singular noun. Use “what kinds of” when asking about multiple types or categories, paired with a plural noun. The difference is entirely about number agreement between the question phrase and the noun that follows it.
The Core Rule in One Sentence
“Kind” is singular, so it pairs with a singular noun. “Kinds” is plural, so it pairs with a plural noun (or an uncountable noun used in a general sense). That’s the whole rule. Everything else in this guide just helps you apply it correctly in real situations.
What “What Kind of” Really Means
“What kind of” asks about one category or type of something. It treats the answer as a single group, even if that group contains many examples.
Examples:
- What kind of music do you listen to?
- What kind of phone does she have?
- What kind of person lies about something like that?
In each case, the speaker expects one type as the answer, such as “jazz,” “an iPhone,” or “a dishonest person.” Notice the noun right after “kind of” is always singular: music, phone, person.
When to Use “What Kind of”
Use this phrase when:
- You’re asking about a single item, person, or category
- The noun following it is singular or uncountable (music, coffee, advice, weather)
- You expect one answer, not a list
A quick trap to watch for: uncountable nouns like “music,” “advice,” and “weather” don’t take an “-s,” but they still pair with “kind of,” not “kinds of,” when you’re asking generally.
What “What Kinds of” Really Means
“What kinds of” asks about multiple categories or types at once. The noun that follows is plural, and the expected answer usually lists more than one type.
Examples:
- What kinds of movies do you enjoy?
- What kinds of shoes work best for hiking?
- What kinds of questions came up in the interview?
Here, the speaker is open to (or expects) several answers: action movies and comedies, trail shoes and boots, technical questions and behavioral questions.
When to Use “What Kinds of”
Use this phrase when:
- You’re asking about more than one category
- The noun following it is plural (movies, shoes, questions)
- You want a range of answers, not just one
Key Difference Explained Simply
Think of it this way: “kind” matches one, “kinds” matches many. The word right after the phrase tells you which one to pick. If that word ends in “-s” and is countable, go with “kinds of.” If it’s singular or uncountable, go with “kind of.”
This is really just standard subject-verb and noun agreement, applied to a question phrase instead of a full sentence.
Comparison Table: What Kind of vs What Kinds of
| Feature | What Kind of | What Kinds of |
| Number | Singular | Plural |
| Follows with | Singular or uncountable noun | Plural noun |
| Expected answer | One type/category | Multiple types/categories |
| Example | What kind of dog is that? | What kinds of dogs make good pets? |
| Common use | Everyday conversation, general questions | Comparisons, broader inquiries |
Real-Life Example Scenarios
Seeing the phrases in everyday context makes the rule easier to remember than any grammar explanation alone.
At a restaurant:
- “What kind of sauce is on this?” (one sauce)
- “What kinds of sauces do you offer?” (a menu with several options)
At a job interview:
- “What kind of experience do you have with Excel?” (one skill area)
- “What kinds of projects have you managed?” (a range of past projects)
In a text to a friend:
- “What kind of mood are you in tonight?”
- “What kinds of snacks should I bring for the party?”
A Grammar Note Most Guides Skip: Verb Agreement
Here’s something many explanations leave out. The verb that follows the phrase should agree with “kind” or “kinds,” not with the noun that comes after “of.”
- What kind of shoes is she wearing? (“kind” is singular, so the verb is singular, even though “shoes” is plural)
- What kinds of shoes are popular this year? (“kinds” is plural, so the verb is plural)
This trips up even confident writers, because the eye jumps to the nearby plural noun instead of the actual subject of the sentence.
Common Mistakes and How to Avoid Them
Mistake 1: Mixing singular “kind” with a plural noun. Wrong: What kind of cars do you like? Right: What kind of car do you like? OR What kinds of cars do you like?
Mistake 2: Using plural “kinds” with a singular noun. Wrong: What kinds of car is that? Right: What kind of car is that?
Mistake 3: Forgetting verb agreement. Wrong: What kind of songs is on the playlist? Right: What kind of songs are on the playlist? (or better: What kind of song is on the playlist?)
Mistake 4: Adding “a” or “an” after “kind of” or “kinds of” unnecessarily. Wrong: What kind of a job are you looking for? More natural in most writing: What kind of job are you looking for?
This “a” isn’t strictly incorrect in casual speech, but it’s usually dropped in clean, professional writing.
Helpful Memory Trick
Picture a single basket labeled “kind” and a row of several baskets labeled “kinds.” One basket holds one type of thing. Several baskets hold several types. If you’re only picturing one basket in your head when you ask the question, use “kind of.” If you’re picturing a row of them, use “kinds of.”
Another quick trick: say the sentence out loud. If it sounds like you’re asking for a list, “kinds” usually fits better.
American vs British English Differences
Both American and British English follow the same core rule for singular versus plural agreement. There’s no major regional split on which one is “correct” the way there is with words like “colour” versus “color.”
That said, British English speakers sometimes use “what kind of” more loosely in casual speech even when the topic feels plural, similar to how some American speakers do the same. Neither is a strict regional rule, just a pattern in informal conversation. For formal writing, both American and British style guides recommend matching “kind” and “kinds” to the noun’s number.
Related Phrases and Synonyms
A few related expressions follow the same singular-plural logic:
- What type of / what types of — works exactly like kind of / kinds of
- What sort of / what sorts of — more common in British English, same rule applies
- What category of / what categories of — more formal, often used in technical or academic writing
If you’re ever unsure about “kind” versus “kinds,” swapping in “type” or “types” and checking if it sounds natural can help confirm your choice, since the same singular/plural logic applies across all three.
Why This Distinction Matters
This might seem like a small detail, but subject-noun agreement is one of the first things readers notice, even if they can’t explain why a sentence feels off. In professional writing, resumes, emails, and reports, getting this right signals attention to detail. In casual writing, it just makes your sentences read more smoothly. Either way, a small fix like this one adds up.
Practice Sentences
Try filling in “kind” or “kinds” before checking your answer:
- What ______ of books do you read before bed? (kind, since the answer is usually one genre)
- What ______ of vegetables grow well in this climate? (kinds, since multiple vegetables likely grow well)
- What ______ of weather do you prefer? (kind, since weather is uncountable)
- What ______ of exercises target the core? (kinds, since there are multiple exercises)
- What ______ of person would say that? (kind, since it’s asking about one type of person)
Frequently Asked Questions
Is “what kind of” or “what kinds of” more common in everyday speech?
“What kind of” is more common overall, since most everyday questions ask about a single type of thing. “What kinds of” shows up more often in questions that expect a broader or listed answer.
Can I use “kinds” with a singular noun if I mean it in a general sense?
No. Even in a general sense, “kinds” needs a plural noun to stay grammatically correct. If you want to speak generally about one category, use “kind of” instead.
Is “what kind of a” ever correct?
It’s grammatically accepted in informal speech, especially in American English, but it’s usually unnecessary. Clean, professional writing tends to drop the “a” and just use “what kind of.”
Does the rule change when the noun is uncountable, like “music” or “advice”?
No. Uncountable nouns still pair with “kind of,” not “kinds of,” because they don’t have a plural form in this context, even though they can represent many varieties.
How do I fix a sentence if I’m not sure whether to use “kind” or “kinds”?
Look at the noun right after “of.” If it’s singular or uncountable, use “kind of.” If it’s plural, use “kinds of.” Then double check that your verb matches “kind” or “kinds,” not the noun.
Conclusion
The choice between what kind of vs what kinds of always comes back to one question: is the noun that follows singular or plural? Match “kind” with singular and uncountable nouns, and match “kinds” with plural nouns, and your sentences will read naturally every time. Once this small rule clicks, you won’t need to pause and second-guess it again.
