Megabytes to Kilobytes Converter

About the mb to kb calculation

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

Formula

KB = MB × 1,000

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

Worked example

To convert 500 MB, multiply by 1,000: 500 × 1,000 = 500,000 KB.

Frequently asked questions

How many kilobytes are in a megabyte?

There are 1,000 kilobytes in one megabyte. To convert any amount, multiply the number of megabytes by 1,000.

How do I convert kilobytes back to megabytes?

Divide instead of multiplying, or equivalently multiply by 0.001. One kilobyte is 0.001 megabytes.

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?

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

Sources

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