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
which is to
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "which is to" is correct and usable in written English.
You can use this phrase to introduce a definition, purpose, result, or explanation. For example, "The purpose of this exercise, which is to strengthen your core, will help you to stay fit."
✓ Grammatically correct
News & Media
Academia
Alternative expressions(20)
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
60 human-written examples
Which is to say: like a bitch.
News & Media
Which is to say, the oil companies.
News & Media
Which is to say, not much.
News & Media
Which is to say, it became uncool.
News & Media
Which is to say, ten minutes early.
News & Media
Which is to say, all of us.
News & Media
Which is to say, all the time.
News & Media
Which is to say, very cautiously.
News & Media
Which is to mow the grass".
News & Media
Which is to say, most Cypriots.
News & Media
(Which is to say, just about everyone).
News & Media
Expert writing Tips
Best practice
Use "which is to" to introduce a definition, purpose, or explanation that directly relates to the noun or phrase it follows. It provides a concise way to clarify meaning.
Common error
Avoid using "which is to" to connect independent clauses or unrelated ideas. It should always refer back to a specific noun or phrase for clarification, not as a general conjunction.
Source & Trust
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The primary grammatical function of "which is to" is to introduce a relative clause that provides further explanation or clarification regarding a preceding noun or phrase. As Ludwig AI states, it is grammatically correct and used to introduce definitions, purposes, results, or explanations. Examples include "Which is to say, like a bitch" and "Which is to say, ten minutes early."
Frequent in
News & Media
84%
Academia
13%
Formal & Business
1%
Less common in
Science
1%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "which is to" serves as a versatile phrase used to introduce clarification, explanation, or rephrasing. As Ludwig AI confirms, this phrase is grammatically sound and widely used in English writing. It's prevalent in News & Media and Academic contexts, lending itself to both formal and informal tones. While "which is to" is very common, it's crucial to remember that it must be used to refer back to a particular noun or phrase for clarification. Alternatives such as "that is to say" or "in other words" can provide similar functionality. Mastering the use of "which is to" can enhance the clarity and precision of your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
that is to say
Offers a direct rephrasing or clarification of the preceding statement.
in other words
Presents the information in a different, often simpler, manner.
namely
Introduces specific details or examples related to the previous statement.
that means
Indicates the implication or consequence of the preceding statement.
put differently
Rephrases the statement with a different perspective or wording.
to be precise
Adds more accuracy and detail to the previous statement.
more specifically
Provides a narrower focus and further detail.
to clarify
Explicitly aims to remove ambiguity or confusion.
this implies
Highlights the logical consequence or implication.
as an explanation
Introduces a reason or justification for the previous statement.
FAQs
How can I use "which is to" in a sentence?
Use "which is to" to provide a definition, purpose, or explanation directly related to the preceding noun or phrase. For example: "The primary goal, "which is to" improve efficiency, will require significant investment."
What are some alternatives to "which is to"?
You can use alternatives like "that is to say", "in other words", or "namely" depending on the specific nuance you want to convey. Each alternative offers a slightly different flavor of clarification or explanation.
Is it always necessary to use a comma before "which is to"?
Yes, generally a comma precedes "which is to" because it introduces a nonrestrictive clause, providing additional but nonessential information. Omitting the comma can sometimes change the meaning or make the sentence grammatically incorrect.
What's the difference between "which is to" and "that is to say"?
"Which is to" is used to add information about something, while "that is to say" is used to clarify or rephrase a previous statement. While they are similar, "that is to say" focuses more on restatement than additional detail.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested