Kilobytes to Bytes Converter

Kilobytes to Bytes

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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.

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

A Sense of Scale

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

Precision

The factor 1000 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 kilobyteToByte = (value) => value * 1000; ``

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 KB with the factor truncated at each decimal place:

Decimals kept	Factor	137 KB becomes	Error
0	1000	137,000	—
1	1000	137,000	—
2	1000	137,000	—
3	1000	137,000	—
4	1000	137,000	—

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 kilobytes to three significant figures, the answer in bytes is only good to three — writing more digits claims precision the measurement never had.