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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
of which roughly
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "of which roughly" is correct and usable in written English.
It can be used when you want to indicate an approximate quantity or estimate related to a specific subject or context. Example: "The study surveyed 1,000 participants, of which roughly 60% reported feeling satisfied with their experience."
✓ Grammatically correct
News & Media
Science
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
49 human-written examples
He pays her $20,000 a month, of which roughly half is alimony and half child support.
News & Media
Thurber's youthful letters, of which roughly a hundred pages' worth are included, are mostly self-conscious and sophomoric.
News & Media
There are now about 1,200 sites waiting to be cleaned up, of which roughly half are orphan sites.
News & Media
Sega officials said the company did not have deep enough pockets to market the Dreamcast, of which roughly 6.5 million were sold worldwide, the company said.
News & Media
Nediya interpolates lyrics from an old Kuwaiti song, part of which roughly translates as: "Morning dew, go to my lover's house as an offering to him.
News & Media
It had revenues of about £117m in 2009, of which roughly half came from the public sector, and provided a dividend of about £5m to the Treasury.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
10 human-written examples
One standard drink was defined as 0.5 l of beer, 2 dl of wine or 50 ml of spirits, which roughly equals 20 g ethanol.
Science
The 80,700 BAC-end sequences added up to a total of about 56.5 Mb of sequence, which roughly corresponds to 0.05 genome equivalents.
Science
Super Thursday also sees the release of an armload of books exploring the Danish concept of hygge, which roughly translates as cosiness.
News & Media
This fraction is equivalent with the effective synthesis yield per additional G of 40% 50% which roughly halves the number of remaining full length probes according to our data.
Science
Secondly, the Bayesian theory is not sensitive to the weight of evidence which, roughly put, is the amount of evidence that is available.
Science
Expert writing Tips
Best practice
Use "of which roughly" to provide an estimate when the exact number isn't known or necessary. For example: "The project required 200 hours, "of which roughly" 50 were spent on research."
Common error
Avoid using "of which roughly" with uncountable nouns. Instead, opt for phrases like "roughly the amount of" or "approximately the quantity of". For example, avoid saying "the water, "of which roughly" half was polluted" and say "the water, roughly half the amount was polluted".
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "of which roughly" functions as a prepositional phrase introducing an approximation or estimate related to a previously mentioned quantity. Ludwig indicates that this phrase is commonly used to provide an inexact figure or proportion.
Frequent in
News & Media
37%
Science
35%
Formal & Business
13%
Less common in
Wiki
7%
Encyclopedias
2%
Academia
0%
Ludwig's WRAP-UP
In summary, the phrase "of which roughly" is a common and grammatically sound way to introduce an approximate quantity or proportion. According to Ludwig, its usage spans across different contexts including news, science and business communication. When precision isn't critical, it's an effective tool for conveying estimates and is considered acceptable. When referring to people, it's more appropriate to use the phrase "of whom roughly". Overall, "of which roughly" is a versatile phrase for indicating approximations.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
approximately which
Swaps the prepositional order and uses "approximately" instead of "roughly".
about which
Replaces "roughly" with "about" for a less formal tone.
of whom approximately
Similar to "of which approximately", but used for people instead of things.
a portion of which
Replaces "roughly" with "a portion" to emphasize a segment of the whole.
a percentage of which
More specific, implying a calculated fraction.
a fraction of which
Indicates a smaller part of the whole.
some of which
Vague and general, indicating an unspecified amount.
a share of which
Suggests a division or allotment.
around which
Less precise than "roughly", indicating a general area.
in the vicinity of which
More formal and indirect way of indicating approximation.
FAQs
How can I use "of which roughly" in a sentence?
Use "of which roughly" to indicate an approximate portion or quantity related to a specific whole. For example: "The company has 500 employees, "of which roughly" 100 work remotely."
What phrases are similar to "of which roughly"?
Similar phrases include "approximately which", "about which", or "a portion of which", depending on the desired level of formality and precision.
Is it better to use "of which approximately" or "of which roughly"?
"Of which approximately" and "of which roughly" are quite similar. "Approximately" is generally considered more formal than "roughly", but both are acceptable.
Can I use "of which roughly" when referring to people?
While "of which" typically refers to things, you can use "of whom roughly" when referring to people. For instance: "The team consists of 20 members, "of whom roughly" half are engineers."
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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
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested