Guide
How to Convert KB to MB: 1,000 vs. 1,024 Explained
To convert KB to MB, first check which convention your number uses. Decimal units divide by 1,000; binary units divide by 1,024. Our Data Size Converter uses the binary calculation, even though its menu labels are KB and MB.
The quick conversion
Under this tool's 1,024-based convention, MB = KB ÷ 1,024. Enter 2,048 KB and the result is 2 MB. To go the other way, multiply: 3 MB × 1,024 = 3,072 KB.
Decimal conversion is different: 2,048 KB ÷ 1,000 = 2.048 MB. Neither calculation should be chosen by habit; choose the one used by the source of your measurement.
KB and KiB are not formally the same unit
In standard decimal notation, a kilobyte (kB, often written KB) is 1,000 bytes and a megabyte (MB) is 1,000,000 bytes. Binary notation uses kibibytes (KiB), 1,024 bytes, and mebibytes (MiB), 1,048,576 bytes.
Some software uses KB and MB labels for binary quantities. That is the convention followed by this tool. Its 1 MB result represents 1 MiB in precise binary notation, not a decimal megabyte. Check a product's documentation when the distinction matters.
A worked file-size example
Suppose a file is reported as 5,242,880 bytes. Divide by 1,024 once to get 5,120 binary kilobytes; divide again to get 5 binary megabytes. In this converter, enter 5,242,880 and choose B to see those results together.
Using decimal units, the same file is 5.24288 MB. The file has not grown or shrunk: only the unit has changed. Keep the byte count when comparing results from programs that use different conventions.
Bytes are not bits
One byte contains eight bits. File sizes are generally expressed in bytes, while connection speeds are often expressed in bits per second. A 40-megabit-per-second connection is not a 40-megabyte-per-second connection.
This tool converts amounts of data, not transfer speeds or download times. Compression, network overhead, and changing speeds also affect real downloads; converting a file size alone cannot predict the completion time.
Check your size without changing the file
Enter a nonnegative value and select B, KB, MB, GB, or TB. The tool displays all five equivalents using powers of 1,024. Decimal input is accepted, and displayed answers may be rounded.
For an upload limit, confirm whether the service means decimal or binary megabytes and leave some room below the limit. This converter does not compress files or reduce their size; it expresses the same quantity in different units.
Try it yourself
Put this guide into practice with our free Data Size Converter — no sign-up, no download.
Open the Data Size Converter