Kilobytes to Megabits Converter

Kilobytes to Megabits

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

The Formula

`` megabits = kilobytes × 0.008 kilobytes = megabits × 125 `

One kilobyte is 0.008 megabits, and one megabit is 125 kilobytes.

Conversion Table

Kilobytes	Megabits
1 KB	0.008 Mb
2 KB	0.016 Mb
5 KB	0.04 Mb
10 KB	0.08 Mb
25 KB	0.2 Mb
50 KB	0.4 Mb
100 KB	0.8 Mb
500 KB	4 Mb
1,000 KB	8 Mb

The Other Direction

Megabits	Kilobytes
1 Mb	125 KB
2 Mb	250 KB
5 Mb	625 KB
10 Mb	1,250 KB
25 Mb	3,125 KB
50 Mb	6,250 KB
100 Mb	12,500 KB
500 Mb	62,500 KB
1,000 Mb	125,000 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.

Megabits (Mb) — 1,000,000 bits. The unit internet plans are sold in — deliberately, because it makes the number eight times larger.

A Sense of Scale

• A page of plain text is about 2 KB
• A small icon is 5–20 KB
• HD streaming needs 5 Mbit/s
• 100 Mbit/s downloads at about 12.5 MB/s

Precision

The factor 0.008 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

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.
• Mb is megabits, MB is megabytes. A 100 Mbps connection delivers roughly 12.5 MB/s, not 100.

In Code

`javascript const kilobyteToMegabit = (value) => value * 0.008; ``

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	0	0	100.0000%
1	0	0	100.0000%
2	0.01	1.37	25.0000%
3	0.008	1.096	—
4	0.008	1.096	—

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 megabits is only good to three — writing more digits claims precision the measurement never had.