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Labs

Calculators & Converters

File Size Converter

Convert file sizes between bytes and the decimal (KB) and binary (KiB) units. Storage vendors and operating systems often use different ones.

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This runs entirely in your browser. Nothing you type is sent to a server.

How to convert a file size

  1. 1Enter a number and the unit it is in.
  2. 2Say whether that unit is decimal (1 KB = 1,000 bytes) or binary (1 KiB = 1,024 bytes).
  3. 3Read the same size across bytes, KB, MB, GB and the binary units.

Questions

Why is a 1 MB file not 1,024 KB?

Decimal megabytes use powers of 1,000. Binary mebibytes use powers of 1,024. A drive sold as 1 TB holds about 0.91 tebibytes, which is why the operating system shows a smaller number.

Which system should I pick?

Network speeds and many file listings use decimal. Memory and a lot of operating-system file sizes use binary. The table shows both so you can match the source you are reading.

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