Megabytes to Kilobytes
An instant megabytes-to-kilobytes converter, with the formula and a reference table below.
| Megabytes | Kilobytes |
|---|---|
| 1 MB | 1000 KB |
| 2 MB | 2000 KB |
| 3 MB | 3000 KB |
| 5 MB | 5000 KB |
| 10 MB | 10000 KB |
| 25 MB | 25000 KB |
| 50 MB | 50000 KB |
| 100 MB | 100000 KB |
How to use
- Enter a value in the Megabytes field.
- The Kilobytes figure appears immediately — no button to press.
- Typing in the Kilobytes field converts back to Megabytes the same way.
- Use the reference table for the values that come up most often.
Megabytes to Kilobytes formula
To convert megabytes to kilobytes, multiply by 1000.
KB = MB × 1000
Put another way, one megabyte is exactly 1,000 kilobytes.
Why this factor: the megabyte and the kilobyte are both defined against the byte, so dividing one definition by the other gives 1000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000 — or use the Kilobytes to Megabytes converter, which is the same calculation reversed.
Worked example
Start with 64 MB. Multiply by 1000 to get 64000 KB.
64 MB × 1000 = 64000 KB
The converter above does this for any value you type, in either direction.
What is a megabyte?
A megabyte is one million bytes, the familiar unit for photos, songs and app sizes.
Definition: Exactly 1,000,000 bytes under SI prefixes. The binary mebibyte (MiB) is 1,048,576 bytes.
Where it is used: Photo and audio file sizes, app downloads, and mobile data allowances.
What is a kilobyte?
A kilobyte is 1,000 bytes in the decimal convention used by storage manufacturers and standards bodies.
Definition: Exactly 1,000 bytes under SI prefixes. The binary equivalent, 1,024 bytes, is properly the kibibyte (KiB).
Where it is used: Small file sizes, text documents, and web page weights.
Worth knowing: This decimal-versus-binary split is why a '1 TB' drive shows as about 931 GB in Windows: the drive uses 10¹², the OS displays 2⁴⁰.
Megabytes vs Kilobytes
The megabyte and the kilobyte belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many kilobytes are in a megabyte?
One megabyte equals 1000 kilobytes.
What is the formula to convert megabytes to kilobytes?
Multiply the number of megabytes by 1000. To reverse it, divide by 1000 instead.
How do I convert kilobytes back to megabytes?
Divide by 1000, which is the same as multiplying by 0.001.
How many kilobytes are in 10 megabytes?
10 MB works out to 10000 KB.
Is there anything to watch out for with kilobytes?
This decimal-versus-binary split is why a '1 TB' drive shows as about 931 GB in Windows: the drive uses 10¹², the OS displays 2⁴⁰.
How is the megabyte defined?
Exactly 1,000,000 bytes under SI prefixes. The binary mebibyte (MiB) is 1,048,576 bytes.