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Byte Size Calculator

Convert between data storage units: bits, bytes, KB, MB, GB, TB, PB (SI decimal) and KiB, MiB, GiB, TiB, PiB (binary). Instant results.

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How to use

  1. Enter a size and its original unit.
  2. Compare the decimal and binary results.

This example illustrates one supported operation. Choose the matching mode and settings above; generated values and formatting may vary.

Example input or settings

1 GB

Example result

1000 MB
1000000000 B
0.9313225746 GiB

Why are GB and GiB different?

1 GB is one billion bytes. 1 GiB is 2 to the power of 30 bytes. Label the unit when comparing sizes.

SI units (KB, MB, GB) use powers of 1000; binary units (KiB, MiB, GiB) use powers of 1024.