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Why a kilobyte is 1000 and not 1024 bytes
(zeta.one)
This is a most excellent place for technology news and articles.
Just to add, I would argue that by definition of prefixes it is 1000.
However there are other terms to use, in this case Kibibyte (kilo binary byte, KiB instead of just KB) that way you are being clear on what you actually mean (particularly a big difference with modern storage/file sizes)
EDIT: Of course the link in the post goes over this, I admit my brain initially glossed over that and I thought it was a question thread