Bytes (B) to Kilobytes (KB) Converter

File sizes here use the decimal (SI) system, the same one drive makers and network providers use. In that system 1 Byte is 10⁰ bytes and 1 Kilobyte is 10³ bytes. Divide one by the other and you get the ratio between the two units: 10⁰ ÷ 10³ = 10⁻³.

Byte is the smaller unit, so you divide. One B is only 0.001 of a KB, which means the decimal point moves 3 places to the left.

These two sit side by side on the ladder (B → KB → MB → GB → TB → PB → EB → ZB → YB → RB → QB), so there is nothing to work out beyond remembering that every step is a factor of 1,000.

Need the other direction? Open the KB to Bytes (B) converter.

A byte is eight bits, enough to store one character of plain English text. Bytes show up whenever you need the exact number: file properties, HTTP headers, memory buffers, database column limits and the counts programs print in logs.

A kilobyte is 1,000 bytes, roughly a short paragraph of text. Kilobytes are the everyday unit for small files such as text documents, icons, config files and scripts, and for tight limits like form uploads or email signatures.

Starting from bytes means turning an exact count into a unit people can read at a glance.

Going from bytes up to kilobytes always gives a smaller number, because you are counting in bigger chunks. People do it to make a long number readable, or to compare a file with the size of a drive or a plan.