Kilobyte to Megabyte Converter
Converts kilobyte to megabyte (KB to MB) and back. The conversion factor is shown below every result.
How to Convert Kilobyte to Megabyte
What Is a Kilobyte?
A kilobyte (KB), by the SI prefix standard, is 1,000 bytes. Some operating systems instead use a binary 1,024-byte value, which is properly named a kibibyte (KiB).
What Is a Megabyte?
A megabyte (MB), by the SI prefix standard, is 1,000,000 bytes (1,000 KB).
Common Kilobyte to Megabyte Reference Points
Real-world reference values for quick sanity checks.
| Item | Kilobyte (KB) | Megabyte (approx.) |
|---|---|---|
| A short plain-text email | 5 KB | 0.005 MB |
| A small compressed photo | 500 KB | 0.5 MB |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Kilobyte to Megabyte Conversion Table
| Kilobyte (KB) | Megabyte (MB) |
|---|---|
| 1 KB | 0.001 MB |
| 10 KB | 0.01 MB |
| 100 KB | 0.1 MB |
| 500 KB | 0.5 MB |
| 1000 KB | 1 MB |
| 2000 KB | 2 MB |
| 5000 KB | 5 MB |
| 10000 KB | 10 MB |
| Source: NIST SI prefix guidance; IEC 60027-2 (binary prefixes KiB/MiB/GiB are the correct names for 1,024-based values) | |
Frequently Asked Questions
How do I convert kilobytes to megabytes?
Divide the kilobyte value by 1,000 (or multiply by 0.001). For example, 2,500 KB × 0.001 = 2.5 MB.
Why does my computer show a different number than this calculator?
Many operating systems (including Windows' File Explorer) label file sizes using 1,024-based math while still calling the unit "MB" or "GB." This page uses the standard decimal SI definition (1,000-based), which is what storage manufacturers and the formal unit names actually mean. The 1,024-based value has its own correct name: kibibyte, mebibyte, gibibyte (KiB, MiB, GiB).
Which definition is correct?
By the SI prefix standard and IEC 60027-2, decimal (1,000-based) is correct for KB/MB/GB; the 1,024-based values should technically be called KiB/MiB/GiB. In practice, both conventions are used in the wild, which is the actual source of the size discrepancy people notice.
Related Data Storage Converters
A good measuring tool marked in both KB and MB removes the guesswork at the point of use.