Bytes to Kilobytes Converter

Bytes to Kilobytes

Convert bytes (B) to kilobytes (KB). Both measure digital storage, and the conversion comes up in computing, storage, internet work.

The Formula

`` kilobytes = bytes × 0.001 bytes = kilobytes × 1000 `

One byte is 0.001 kilobytes, and one kilobyte is 1,000 bytes.

Conversion Table

Bytes	Kilobytes
1 B	0.001 KB
2 B	0.002 KB
5 B	0.005 KB
10 B	0.01 KB
25 B	0.025 KB
50 B	0.05 KB
100 B	0.1 KB
500 B	0.5 KB
1,000 B	1 KB

The Other Direction

Kilobytes	Bytes
1 KB	1,000 B
2 KB	2,000 B
5 KB	5,000 B
10 KB	10,000 B
25 KB	25,000 B
50 KB	50,000 B
100 KB	100,000 B
500 KB	500,000 B
1,000 KB	1,000,000 B

What Each Unit Is

Bytes (B) — 8 bits. Coined at IBM in 1956 for the group of bits encoding one character.

Kilobytes (KB) — 1,000 bytes in decimal usage; 1,024 bytes in the binary convention (properly a kibibyte). The ambiguity dates to early computing, where 1,024 was close enough to "kilo" to reuse the prefix.

A Sense of Scale

• One ASCII character is 1 byte
• A UTF-8 emoji is often 4 bytes
• A page of plain text is about 2 KB
• A small icon is 5–20 KB

Precision

The factor 0.001 is exact by international agreement, not a rounded approximation. Any imprecision in a result comes from your input, not the conversion.

Watch Out For

• This converter uses decimal (1 KB = 1,000 bytes), which is what drive manufacturers and networks use. Windows reports binary, which is why a "1 TB" drive shows as 931 GB.

In Code

`javascript const byteToKilobyte = (value) => value * 0.001; ``

Where This Conversion Comes Up

• Computing
• Storage
• Internet
• Media
• Backups

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 B with the factor truncated at each decimal place:

Decimals kept	Factor	137 B becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0.001	0.137	—
4	0.001	0.137	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured bytes to three significant figures, the answer in kilobytes is only good to three — writing more digits claims precision the measurement never had.