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Discover LudwigThe phrase "about a factor of" is correct and usable in written English.
It is typically used in mathematical or scientific contexts to indicate a multiplicative change or comparison in size or quantity.
Example: "The population of the city has increased by about a factor of three over the last decade."
Alternatives: "approximately three times" or "roughly a multiple of".
Exact(59)
grows by about a factor of three as the mass doubles.
As of this writing, the scanner has exceeded its $50,000 goal by about a factor of three, and with more than two weeks left to go.
It is found that the theoretical results are larger than the experimental ones by about a factor of ten.
We estimate that the velocity-magnitude perpendicular to B has also grown by about a factor of two.
The Recording Industry Association of Japan had pushed for the move, suggesting that illegal media downloads outnumbered legal ones by about a factor of 10.
The related savings were about a factor of 9 the energy cost for air-conditioning.
For the graded media the switching field distribution is reduced by about a factor of two.
The orange line shows a ~60% improvement/year or about a factor of 10 in 5 years.
For best results, this initial guess should be within about a factor of three of the actual source size.
The number of clusters several billion years ago is about a factor of 10 too small, the calculations show.
Similar(1)
The corresponding bulk yield strength (compression) of micron-Ni is, about a factor-of-three smaller than the nano-Ni.
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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