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Discover LudwigSuggestions(5)
"a rule of thumb" is correct and usable in written English.
It is an old English saying that means a practical principle that is not based on scientific facts but can be used to give an approximate answer or guide to something. For example, "It's a rule of thumb to always double check your work before submitting it."
Idiom
Rule of thumb.
(USA) A basic rule that is usually but not always correct.
Exact(57)
"Poverty protects," said Mr. de Koster, invoking a rule of thumb from the museum world.
It's a rule of thumb.
This isn't a rule of thumb for art over all.
As a rule of thumb, clothes matching is inadvisable.
"Thirty days, as a rule of thumb," Hendricks said.
"A rule of thumb with humor," it says.
As a rule of thumb, this happens in colder water.
Is there a rule of thumb to estimate this?
As a rule of thumb, the expected standard equates to the previous 4B level.
Similar(2)
A rule-of-thumb chart is presented to predict flow losses for similar installations.
As a rule-of-thumb this limit is at zero.
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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