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Data Storage Converter

Convert bits, bytes, KB, MB, GB and TB — and the binary KiB, MiB, GiB and TiB that operating systems often use — to see why a “1 TB” drive shows less space.
Data size in megabytes
1,000 MB
1 GB = 1,000 MB
1 GB in every unit
  • Bits8,000,000,000 bit
  • Bytes1,000,000,000 B
  • Kilobytes1,000,000 KB
  • Megabytes1,000 MB
  • Gigabytes1 GB
  • Terabytes0.001 TB
  • Kibibytes976,562.5 KiB
  • Mebibytes953.67432 MiB
  • Gibibytes0.93132257 GiB
  • Tebibytes0.0009094947 TiB

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How to use it

  1. Enter a size and its unit.
  2. Choose a decimal (GB) or binary (GiB) unit to convert to.
  3. Check the full table to compare both systems.

Examples

The missing drive space

A 1 TB drive holds 1,000,000,000,000 bytes, which is 0.909 TiB. Systems that label TiB as “TB” show it as about 931 GB.

Network vs file sizes

Speeds are usually in bits: a 100 megabit per second connection moves 12.5 megabytes per second at best.

Conversion tables

Terabytes to gibibytes
TerabytesGibibytes
0.5 TB465.66 GiB
1 TB931.32 GiB
2 TB1,862.6 GiB
4 TB3,725.3 GiB
8 TB7,450.6 GiB
16 TB14,901 GiB
Gigabytes to gibibytes
GigabytesGibibytes
16 GB14.901 GiB
32 GB29.802 GiB
64 GB59.605 GiB
128 GB119.21 GiB
256 GB238.42 GiB
512 GB476.84 GiB

Decimal and binary units

Storage makers use decimal (SI) prefixes: 1 KB = 1,000 bytes, 1 MB = 1,000,000 bytes. Binary (IEC) units use powers of 1,024: 1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes.

Windows reports sizes in binary units but labels them KB, MB and GB, which is why the numbers look smaller than the box says. macOS uses decimal units since 2009.

1 GB = 10⁹ bytes · 1 GiB = 2³⁰ bytes = 1.073741824 GB

Frequently asked questions

Is 1 GB 1,000 MB or 1,024 MB?

Strictly, 1 GB is 1,000 MB and 1 GiB is 1,024 MiB. In everyday use “GB” is used for both, so check which one a program means.

How many bits are in a byte?

Eight. Internet speeds in megabits per second (Mbps) divide by 8 to get megabytes per second.

Why does my phone show less storage than advertised?

Partly the decimal/binary difference, and partly space used by the operating system and preinstalled apps.

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More in Converters · Last reviewed October 2026