Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
on what topic
Grammar usage guide and real-world examplesUSAGE SUMMARY
"on what topic" is a correct and usable phrase in written English.
You can use it when you want to ask someone about the subject of a particular conversation, discussion, article, etc. For example, you might say, "We've been talking for a while now, can you tell me on what topic this discussion is focused?".
✓ Grammatically correct
News & Media
Science
Wiki
Formal & Business
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
5 human-written examples
Top officials, from cabinet members on down, were often told when they would speak in Bush's presence, for how long and on what topic.
News & Media
I want them to chose something they care deeply about, and I told them there were no parameters on what topic they could pick.
News & Media
This must be the first step in writing your paper and your thesis statement because all direction of the paper will depend on what topic you are writing about.
Wiki
On WHAT topic ("one of the most important social controversies of the day") has the Supreme Court recently agreed to hear cases?
News & Media
On WHAT topic would you like to see Mr. Gorman create a ScienceTake video?
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
53 human-written examples
On what topics is John Paul described as being a "divisive, polarizing figure"?
News & Media
She wants to write more books, she said, though she would not say on what topics.
News & Media
Who would you like to see write for us and on what topics?
News & Media
Likewise, in an e-mail to supporters last week, he touched on what topics he might tackle as mayor only in passing, saying, "We can recycle better and commute better".
News & Media
There was so much infighting about whether to have such a rally, who would speak, in what order and on what topics that Mr. Svilanovic said the other day that he was "ashamed" of the opposition.
News & Media
It isn't simply based on what topics you start and add to.
News & Media
Expert writing Tips
Best practice
When asking a question, ensure the context is clear to avoid ambiguity about "on what topic" you are inquiring. For example, "The presentation was engaging, but on what topic was it focused?"
Common error
Avoid using "on what topic" without a clear antecedent. Instead of saying, "On what topic are we meeting?", provide context: "Regarding the project proposal, on what topic are we meeting?".
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "on what topic" primarily functions as an interrogative prepositional phrase. It is used to seek information about the subject of a discussion, presentation, document or any form of communication. As Ludwig AI suggests, it is a usable phrase in written English.
Frequent in
News & Media
40%
Science
20%
Wiki
20%
Less common in
Formal & Business
20%
Academia
0%
Encyclopedias
0%
Ludwig's WRAP-UP
In summary, the phrase "on what topic" is a grammatically correct interrogative prepositional phrase used to inquire about a specific subject. While Ludwig AI confirms its usability, it is relatively rare in occurrence, particularly in academic or encyclopedic contexts. It's most frequently found in news, media, and scientific sources. When using "on what topic", it's important to provide clear context to avoid ambiguity. Consider alternatives such as "regarding which subject" or "concerning what matter" for more formal settings. Ludwig's analysis confirms its validity and appropriate usage in eliciting specific information.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
on what subject matter
Adds formality by including "subject matter".
regarding what theme or subject
Combines theme and subject, offering a broad scope.
regarding which subject
Emphasizes the subject matter under consideration; more formal.
concerning what matter
Highlights the importance or relevance of the issue.
about which issue
Focuses on a specific problem or point of contention.
on what area of interest
Highlights the interest or concern that the topic addresses.
with respect to what theme
More formal and emphasizes a particular theme.
pertaining to what question
Highlights the inquiry aspect of the topic.
in reference to what area
Implies a specific field or scope of discussion.
relative to which point
Focuses on a specific detail within a broader discussion.
FAQs
How can I use "on what topic" in a sentence?
You can use "on what topic" to inquire about the subject of a discussion, presentation, or written work. For example: "The email was vague; on what topic should I prepare?". Alternatively, you could use "regarding which subject".
What is a more formal alternative to "on what topic"?
A more formal alternative is "regarding which subject". For instance, instead of "On what topic will the speaker focus?", you could say "Regarding which subject will the speaker focus?". Other options include "concerning what matter" or "on what subject matter".
Which is correct: "on what topic" or "about what topic"?
Both "on what topic" and "about what topic" are grammatically correct and can be used interchangeably. However, "on what topic" may sound slightly more formal. For example, "On what topic is the research paper?" is similar to "About what topic is the research paper?". You may also consider "about which issue".
How does "on what topic" differ from "what is the topic"?
"On what topic" is typically used to inquire within a specific context, while "what is the topic" is a more general inquiry. For example, "Given our previous conversation, on what topic are we now focusing?" implies a continuation or shift in subject. A direct question could be: "what is the topic"?
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested