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Discover LudwigThe phrase "be off by" is correct and usable in written English
The phrase is usually used when someone's guess or prediction is wrong, and generally has a sense of magnitude. For example: "My guess was off by 15 miles."
Exact(60)
"We might be off by only a year".
Kennedy turned out to be off by only five years.
It's no big deal for a paleontologist to be off by a million years.
If those estimates are optimistic, they are unlikely to be off by much.
Canada's wheat harvest may be off by 36 percent this year, because of too much rain.
They could be off by a factor of 10, he said.
Visits by Americans are expected to be off by 15percentt for December.
You can literally be off by half a second and it won't be as effective".
That is, it may be off by as much as three inches at 50 feet.
Mr. Gennaro predicted that overall sales would be off by about 15percentthis yearar.
We did not think we would be off by more than 40 seats.
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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