Bytes to KB Converter
Convert bytes to kilobytes instantly. One byte equals exactly 0.001 kilobytes. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert bytes to kilobytes
Worked example: convert 250 bytes to kilobytes. Using kilobytes ← bytes ÷ 1,000, we get 250 × 0.001 = 0.25 KB. To check the result, convert back: 0.25 KB ÷ 0.001 = 250 B.
Bytes to kilobytes chart
| Bytes (B) | Kilobytes (KB) |
|---|---|
| 1 B | 0.001 KB |
| 2 B | 0.002 KB |
| 3 B | 0.003 KB |
| 4 B | 0.004 KB |
| 5 B | 0.005 KB |
| 6 B | 0.006 KB |
| 8 B | 0.008 KB |
| 10 B | 0.01 KB |
| 12 B | 0.012 KB |
| 15 B | 0.015 KB |
| 20 B | 0.02 KB |
| 25 B | 0.025 KB |
| 30 B | 0.03 KB |
| 40 B | 0.04 KB |
| 50 B | 0.05 KB |
| 75 B | 0.075 KB |
| 100 B | 0.1 KB |
| 150 B | 0.15 KB |
| 200 B | 0.2 KB |
| 250 B | 0.25 KB |
| 500 B | 0.5 KB |
| 1,000 B | 1 KB |
Kilobytes to bytes (reverse)
| Kilobytes (KB) | Bytes (B) |
|---|---|
| 1 KB | 1,000 B |
| 2 KB | 2,000 B |
| 5 KB | 5,000 B |
| 10 KB | 10,000 B |
| 20 KB | 20,000 B |
| 50 KB | 50,000 B |
| 100 KB | 100,000 B |
| 250 KB | 250,000 B |
| 500 KB | 500,000 B |
| 1,000 KB | 1,000,000 B |
About the byte and the kilobyte
A byte is 8 bits and the basic unit of digital storage; one plain English character takes one byte. File sizes below 1 KB are shown in bytes.
A kilobyte is 1,000 bytes in the decimal (SI) system used by storage makers and macOS. Windows and some tools use 1,024 bytes, which is properly called a kibibyte (KiB).
One kilobyte equals 1,000 bytes, which makes the kilobyte the larger unit of the two.
Everyday sizes in bytes and kilobytes
| Everyday example (approximate) | In bytes | In kilobytes |
|---|---|---|
| A short text message | 140 B | 0.14 KB |
| A plain-text email | 5,000 B | 5 KB |
| A web page | 2,000,000 B | 2,000 KB |
| A phone photo | 3,000,000 B | 3,000 KB |
| A 3-minute MP3 song | 5,000,000 B | 5,000 KB |
| A 2-hour HD movie | 3,000,000,000 B | 3,000,000 KB |
Bytes to kilobytes FAQ
How many kilobytes are in one byte?
One byte equals exactly 0.001 kilobytes. In the other direction, one kilobyte equals 1,000 bytes.
How do I convert bytes to kilobytes without a calculator?
convert 250 bytes to kilobytes. Using kilobytes ← bytes ÷ 1,000, we get 250 × 0.001 = 0.25 KB. To check the result, convert back: 0.25 KB ÷ 0.001 = 250 B. For a quick estimate, round the factor to 0.001. Then 250 B is about 0.25 KB, compared with the exact 0.25 KB (an error of 0%). That is close enough for planning, but use the calculator above when the number matters.
What is a 3-minute MP3 song in kilobytes?
A 3-minute MP3 song is about 5,000,000 bytes, which is 5,000 kilobytes. Treat that as an approximate everyday figure rather than an official measurement.
Are the bytes and kilobytes the same in every country?
A byte is 8 bits everywhere. Decimal KB = 1,000 bytes; binary KiB = 1,024 bytes. Windows often labels KiB as KB.