Convert Megabytes to Kilobytes (MB to kB)
1 megabyte (MB) = 1000 kilobytes (kB). 1 kB = 0.001 MB. Example: 1 MB = 1 × 1000 = 1000 kB.
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1 MB = 1000 kB
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megabyte to kilobyte converter to paste a column from Excel.
How to Convert Megabyte to Kilobyte
- 1 MB = 1000 kB
- 1 kB = 0.001 MB
- Example: convert 1 MB to kB: 1 MB = 1 × 1000 kB = 1000 kB
Formula
kB = MB × 1000
Derivation from SI units:
- 1 MB = 10⁶ bytes = 8 × 10⁶ bits (decimal, SI).
- 1 kB = 1000 bytes = 8000 bits (decimal, SI).
- 1 MB = 8000000 bit ÷ 8000 bit per kB = 1000 kB
Both units are defined exactly, so the factor is exact. Megabyte definition: megabyte; Kilobyte definition: kilobyte.
Worked examples
- 1 MB is 1000 kB.
1 MB × 1000 = 1000 kB - A 2 MB upload limit is 2000 kB.
2 MB × 1000 = 2000 kB
Megabyte to Kilobyte conversion table
| Megabytes (MB) | Kilobytes (kB) |
|---|---|
| 1 MB | 1000 kB |
| 2 MB | 2000 kB |
| 4 MB | 4000 kB |
| 8 MB | 8000 kB |
| 16 MB | 16000 kB |
| 32 MB | 32000 kB |
| 64 MB | 64000 kB |
| 100 MB | 100000 kB |
| 128 MB | 128000 kB |
| 256 MB | 256000 kB |
| 500 MB | 500000 kB |
| 1000 MB | 1000000 kB |
Where it's used
Upload and attachment limits in megabytes are converted to kilobytes to compare with file sizes shown in KB by forms and older software. Multiply by 1000.
Megabyte to other data storage units
| Conversion | 1 MB equals |
|---|---|
| megabyte to kilobyte | 1000 kB |
| megabyte to byte | 1000000 B |
| megabyte to gigabyte | 0.001 GB |
| megabyte to terabyte | 0.000001 TB |
| megabyte to bit | 8000000 bit |
| megabyte to megabit | 8 Mbit |
| megabyte to kibibyte | 976.5625 KiB |
| megabyte to mebibyte | 0.9536743164 MiB |
Show 5 more units
| megabyte to gibibyte | 0.0009313225746 GiB |
|---|---|
| megabyte to kilobit | 8000 kbit |
| megabyte to gigabit | 0.008 Gbit |
| megabyte to petabyte | 1 × 10⁻⁹ PB |
| megabyte to tebibyte | 9.094947018 × 10⁻⁷ TiB |
Frequently asked questions
How do I convert MB to KB?
Multiply by 1000: 2 MB = 2000 kB. Some forms use 1024, giving 2048 KiB.
How many kilobytes are in 1 megabyte?
1 MB = 1000 kB.
How do I convert megabytes to kilobytes?
Multiply the value in MB by 1000. For example, 1 MB × 1000 = 1000 kB.
Is the MB to kB conversion exact?
Yes. Both units are defined exactly, and 1 MB is exactly 1000 kB.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7 (SI prefixes); hertz, Table 4.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Megabytes to Kilobytes (MB to kB). Retrieved October 25, 2026, from https://scientificconverters.com/data-storage/megabytes-to-kilobytes/
IEEE
Scientific Converters, "Convert Megabytes to Kilobytes (MB to kB)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/data-storage/megabytes-to-kilobytes/