Kilobytes to Megabytes Converter

About the kb to mb calculation

One kilobyte is exactly 0.001 megabytes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Decimal kilobyte — 1,000 bytes. Windows and macOS often mean 1,024 when they write "KB". Decimal megabyte — 1,000,000 bytes, the definition storage manufacturers use.

Formula

MB = KB × 0.001

1 KB = 0.001 MB
1 MB = 1,000 KB

Worked example

To convert 500 KB, multiply by 0.001: 500 × 0.001 = 0.5 MB.

Frequently asked questions

How many megabytes are in a kilobyte?

There are 0.001 megabytes in one kilobyte. To convert any amount, multiply the number of kilobytes by 0.001.

How do I convert megabytes back to kilobytes?

Divide instead of multiplying, or equivalently multiply by 1,000. One megabyte is 1,000 kilobytes.

Is this conversion exact?

Yes, provided both sides use the same convention. Decimal units (KB, MB, GB) are powers of 1,000 and binary units (KiB, MiB, GiB) are powers of 1,024. Both are exact — the confusion comes from software labelling binary values with decimal names.

Where is each of these units used?

Kilobytes: decimal kilobyte — 1,000 bytes. Windows and macOS often mean 1,024 when they write "KB". Megabytes: decimal megabyte — 1,000,000 bytes, the definition storage manufacturers use.

Sources

• IEC 80000-13 — binary and decimal prefixes for information units