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Data Size Converter

Convert bytes, KB, MB, GB, TB — and understand decimal vs binary units.

  • Free
  • Files stay on your device
  • No sign-up needed
in every unit

Free and unlimited · runs entirely in your browser

Quick answer

Pick your units and enter a size. In the decimal (SI) system used by storage makers, 1 GB = 1,000 MB. In the binary system used by many operating systems, 1 GiB = 1,024 MiB. Also, 1 byte = 8 bits, so a 100 Mbit/s connection moves about 12.5 MB per second.

1 byte:
8 bits
1 KB:
1,000 bytes
1 KiB:
1,024 bytes
1 GB:
1,000,000,000 bytes
1 GiB:
1,073,741,824 bytes
100 Mbit/s:
≈ 12.5 MB/s

Why does a “1 TB” drive show about 931 GB on your computer? Because drive makers count in powers of 1,000, while Windows counts in powers of 1,024. Our data size converter supports both systems, plus bits for internet speeds.

How to use Data Size Converter – step by step

  1. 1 Enter a sizeType the number of units.
  2. 2 Choose unitsDecimal (KB, MB, GB) or binary (KiB, MiB, GiB).
  3. 3 Read the resultAll units are listed below.

Why use our Data Size Converter?

Decimal & binary

KB/MB/GB and KiB/MiB/GiB side by side.

Bits for internet

Megabits and gigabits for connection speeds.

Exact

Uses precise powers of 10 and 2.

Instant

Converts as you type.

Data size charts

Gigabyte (1000³) to Gibibyte (1024³)

Gigabyte (1000³) (GB)Gibibyte (1024³) (GiB)
1 GB0.93132257 GiB
5 GB4.6566 GiB
10 GB9.3132 GiB
25 GB23.2831 GiB
50 GB46.5661 GiB
100 GB93.1323 GiB

Terabyte (1000⁴) to Gibibyte (1024³)

Terabyte (1000⁴) (TB)Gibibyte (1024³) (GiB)
1 TB931.32 GiB
5 TB4,656.61 GiB
10 TB9,313.23 GiB
25 TB23,283.06 GiB
50 TB46,566.13 GiB
100 TB93,132.26 GiB

Megabyte (1000²) to Megabit

Megabyte (1000²) (MB)Megabit (Mbit)
1 MB8 Mbit
5 MB40 Mbit
10 MB80 Mbit
25 MB200 Mbit
50 MB400 Mbit
100 MB800 Mbit

Why your new drive looks smaller

A 1 TB drive holds 1,000,000,000,000 bytes. Divided by 1,073,741,824 (bytes in a GiB) that is about 931 GiB — which Windows labels as “931 GB”. Nothing is missing; it is just a different unit.

Frequently asked questions

Is 1 GB 1000 MB or 1024 MB?
In the SI (decimal) standard, 1 GB = 1,000 MB. The binary unit 1 GiB = 1,024 MiB. Some software uses “GB” to mean GiB, which causes confusion.
How many bits are in a byte?
Eight.
How fast is 100 Mbps in MB/s?
About 12.5 megabytes per second, before overheads.
How many GB is 1 TB?
1,000 GB (decimal), or about 931 GiB (binary).

Last updated November 2026 · Written and tested by the SmallEasyTools team.