Convert Bytes to Kilobytes

About converting Bytes to Kilobytes

Bytes (B) and Kilobytes (KB) are both units of digital storage, so converting between them is a single multiplication: multiply your Bytes figure by 0.001. Ten Bytes comes to 0.01 Kilobytes, and a hundred works out at 0.1 Kilobytes.

Rule of thumb: going from Bytes to Kilobytes divides, so the figure always shrinks — it takes about 1,000 Bytes to make a single Kilobyte. If your answer came out bigger, you have the conversion the wrong way round.

What is a Byte?

The byte is the unit computers actually store things in, and it has not always been eight bits. Werner Buchholz coined the word at IBM in 1956, when a byte meant however many bits a particular machine needed to hold one character — six, seven and nine-bit bytes all existed. Eight bits became the standard with the IBM System/360, and the industry never looked back. Because that old ambiguity was real, networking standards still say "octet" when they want to be unmistakable about meaning exactly eight bits.

What is a Kilobyte?

A kilobyte is 1,000 bytes here, because this site uses the SI meaning of "kilo" — the same thousand as in kilometer, and the same one storage manufacturers print on the box. Computing muddied this by borrowing the prefix for 1,024, the nearest power of two, and Windows still reports storage that way while labelling it "KB". The IEC tried to settle the argument in 1998 by inventing the kibibyte (KiB) for the binary version, so the two could finally be told apart; adoption has been patchy. At this scale the gap is trivial either way.

To put both in perspective: a byte holds a single letter of plain text, while a kilobyte is a paragraph or two of plain text.

The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilobytes to Bytes converter, or browse all Digital Storage converters.