Megabytes to Kilobytes (MB to KB) Converter
1 megabyte equals 1000 kilobytes — multiply the number of megabytes by 1000 to convert MB to KB. So 5 MB is 5000 KB, and 100 MB is 100,000 KB. This uses the decimal (SI) definition, where 1 MB = 1000 KB.
The formula
To convert megabytes to kilobytes, multiply by the exact factor 1000:
KB = MB × 1000
For example, 2.5 MB × 1000 = 2500 KB. To reverse it, divide kilobytes by 1000.
Conversion table
| Megabytes (MB) | Kilobytes (KB) |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
How to convert online
- Type the number of megabytes into the first box.
- Read the kilobytes result instantly in the second box.
- Type a KB value instead to convert back to MB — it works both ways.
Use the Megabyte to Kilobyte Converter — free and instant in your browser.
Where this conversion is used
MB-to-KB conversions help when a service reports sizes in kilobytes but you think in megabytes — email attachment limits, image upload caps, API payload sizes and old-school download counters. Developers and support staff often translate a megabyte file size into kilobytes to check it against a hard byte limit.
FAQ
How many kilobytes are in a megabyte?
One megabyte equals 1000 kilobytes. Multiply MB by 1000, so 10 MB = 10,000 KB and 100 MB = 100,000 KB.
How do I convert kilobytes back to megabytes?
Divide kilobytes by 1000. For example, 2500 KB = 2.5 MB. Our Kilobyte to Megabyte converter does this instantly.
Is 1 MB 1000 KB or 1024 KB?
Under the decimal (SI) standard used here, 1 MB = 1000 KB. The binary mebibyte is 1 MiB = 1024 KiB, which some systems display instead.
Is the conversion exact?
Yes. The factor 1000 is exact for the decimal definition, applied automatically so you never round by hand.
Related converters
- Kilobyte to Megabyte Converter
- Megabyte to Gigabyte Converter
- Megabyte to Byte Converter
- Megabyte to Terabyte Converter
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