KB to MB Converter
Type kilobytes to get megabytes, for checking a file against an upload or attachment limit.
750 kB =
0.75MB
750 kilobytes is 0.75 megabytes.
- In binary units (1024)
- 0.7324 MiB
- 1 kB
- 0.001 MB
- 1 MB
- 1,000 kB
How to convert KB to MB
Divide kilobytes by 1,000. A 2,400 KB scanned document is 2.4 MB, so it fits under a 5 MB upload limit with room to spare.
If the size came from a Windows file listing, it is in kibibytes (1,024 bytes each) even though it says KB. Divide by 1,024 for mebibytes: 2,400 KiB is 2.3438 MiB. The two answers differ by about 2.4%, which only matters when a file is right at a limit.
Strictly, the SI symbol is lowercase kB; a capital K is common but informal. The binary unit is written KiB.
megabytes = kilobytes ÷ 1,000
- The SI prefix kilo means 1,000, written with a lowercase k; the binary kibi (Ki) means 1,024. Source: NIST, Prefixes for binary multiples (IEC 80000-13).
How to estimate KB to MB in your head
Move the decimal point three places left: 750 KB is 0.75 MB, 48 KB is 0.048 MB. For an upload form, think of 1,000 KB as one megabyte and you will never be more than a few percent out, whichever convention the site uses.
Kilobytes to megabytes chart
Typical file and attachment sizes, in decimal MB and as binary (KiB to MiB).
| Kilobytes | Megabytes (÷ 1000) | KiB → MiB (÷ 1024) |
|---|---|---|
| 1 | 0.001 | 0.0009766 |
| 10 | 0.01 | 0.009766 |
| 50 | 0.05 | 0.04883 |
| 100 | 0.1 | 0.09766 |
| 200 | 0.2 | 0.1953 |
| 250 | 0.25 | 0.2441 |
| 500 | 0.5 | 0.4883 |
| 512 | 0.512 | 0.5 |
| 750 | 0.75 | 0.7324 |
| 1,000 | 1 | 0.9766 |
Show all 20 rowsShow fewer
| 1,024 | 1.024 | 1 |
| 1,500 | 1.5 | 1.4648 |
| 2,000 | 2 | 1.9531 |
| 2,048 | 2.048 | 2 |
| 3,000 | 3 | 2.9297 |
| 5,000 | 5 | 4.8828 |
| 10,000 | 10 | 9.7656 |
| 20,000 | 20 | 19.5313 |
| 25,000 | 25 | 24.4141 |
| 50,000 | 50 | 48.8281 |
Frequently Asked Questions
How many KB is 1 MB?
1 MB is 1,000 kB. One MiB is 1,024 KiB, and Windows writes that as 1,024 KB.
Is 500 KB bigger than 1 MB?
No. 500 KB is 0.5 MB, half a megabyte. Any size under 1,000 KB is less than 1 MB.
How do I make a photo smaller than 200 KB for a form?
Reduce its pixel dimensions or save it as a JPEG at a lower quality setting, then check the size again. 200 KB is 0.2 MB, so a typical phone photo of several megabytes needs to shrink by a factor of ten or more.
My file is 25,000 KB. Will it pass a 25 MB email limit?
It is exactly 25 MB in decimal units, so it sits right at the limit. Email encoding also adds about a third to attachments in transit, so compress or share a link instead.