CALCULATORS & CONVERTERS
MB to KB Converter — Free Megabytes to Kilobytes
Convert MB to KB, KB to MB, and between bytes and GB instantly in your browser. Handles both the 1024 (binary) and 1000 (decimal) conventions.
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- Bytes
- 5,000,000
- Kilobytes (KB)
- 5,000
- Megabytes (MB)
- 5
- Gigabytes (GB)
- 0.005
Convert a file size between megabytes, kilobytes, bytes, and gigabytes without doing the multiplication by hand. Type a number in any unit and read the equivalents straight back — handy when a form caps an upload at a number of KB, or a download is quoted in MB and you want the byte count.
The catch worth knowing: 1 MB can mean 1024 KB or 1000 KB, and both are used in the real world. This converter is explicit about which one it is applying so you get the answer that matches your context.
Why 1 MB is sometimes 1024 KB and sometimes 1000 KB
Operating systems, memory, and most software count in binary: 1 MB = 1024 KB = 1,048,576 bytes. Storage vendors and the SI standard count in decimal: 1 MB = 1000 KB = 1,000,000 bytes. The strictly correct binary name is 'mebibyte' (MiB), but almost nobody writes it, so 'MB' is ambiguous in practice.
That gap is exactly why a form that rejects a file 'just over' a limit may accept it once you recompute in the other convention — most systems that enforce byte limits count in 1024s, so use the binary figure when you are near a boundary.
Frequently asked questions
- Is 1 MB equal to 1000 KB or 1024 KB?
- Both conventions exist. Windows and most software use 1 MB = 1024 KB (binary); storage makers and the SI standard use 1 MB = 1000 KB (decimal). This tool lets you pick, so you can match whichever system your figure came from.
- How many KB is a 25 MB attachment limit?
- 25,600 KB in binary terms, or 25,000 KB in decimal. If a file is rejected right at the edge, try the binary figure, since byte-limit checks usually count in 1024s.
- Can I convert raw bytes to MB?
- Yes. Enter a byte count and the tool divides it down to KB, MB, or GB in whichever convention you selected — useful when a log or API reports a size in plain bytes.