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There are 1000 (103) bytes in one kilobyte (kB). The prefix kilo- comes from Greek, and means 1000 (kilogram = 1000 grams, kilometer = 1000 meters).

When referring to memory, it is common to use the term "kilobyte" (abbreviated "KB") as an approximation for 210 = 1024, since memory uses binary addresses and it makes math easier. This is not universal, however.

For instance:

  • A 65,536 byte file is reported as "66 KB" by Mac OS X (standard definition), or "64 KB" by Microsoft Windows (non-standard definition).
  • The HP 21MX real-time computer (1974) denoted 196,608 bytes as "196K", using the standard definition, while the HP 3000 business computer (1973) denoted 131,072 bytes as "128K bytes", using the non-standard definition.

Since this non-standard usage creates ambiguity, confusion, and has even led to lawsuits, the "K = 1024" usage has been explicitly prohibited by SI, officially deprecated by all the major standards organizations, and a new prefix system created for this usage, which defines the "kilobinary byte" or "kibibyte" (KiB) for this binary multiple and affirms that "kilobyte" (kB) always means 1000 bytes.

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There are (approximately) 1000 bytes in a kilobyte so the answer to your question would be 0.001

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14y ago
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Q: How many kilobytes are in a byte?
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