Megabytes to Kilobytes Converter

Megabytes to Kilobytes

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

The Formula

`` kilobytes = megabytes × 1000 megabytes = kilobytes × 0.001 `

One megabyte is 1,000 kilobytes, and one kilobyte is 0.001 megabytes.

Conversion Table

Megabytes	Kilobytes
1 MB	1,000 KB
2 MB	2,000 KB
5 MB	5,000 KB
10 MB	10,000 KB
25 MB	25,000 KB
50 MB	50,000 KB
100 MB	100,000 KB
500 MB	500,000 KB
1,000 MB	1,000,000 KB

The Other Direction

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

What Each Unit Is

Megabytes (MB) — 1,000,000 bytes in decimal usage. The file-size unit of the CD-ROM era.

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

• An MP3 is 3–5 MB
• A phone photo is 2–5 MB
• A JS bundle should stay under 1 MB
• A page of plain text is about 2 KB
• A small icon is 5–20 KB

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 megabyteToKilobyte = (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 MB with the factor truncated at each decimal place:

Decimals kept	Factor	137 MB 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 megabytes to three significant figures, the answer in kilobytes is only good to three — writing more digits claims precision the measurement never had.