Common conversions
| From unit | Value | To unit | Result |
|---|---|---|---|
| Kilobytes (KB) | 1 | Bytes (B) | 1,000 |
| Kibibytes (KiB) | 1 | Bytes (B) | 1,024 |
| Gigabytes (GB) | 1 | Gibibytes (GiB) | 0.9313 |
| Terabytes (TB) | 1 | Gibibytes (GiB) | 931.3226 |
| Gibibytes (GiB) | 1 | Megabytes (MB) | 1,073.7418 |
| Bytes (B) | 1 | Bits | 8 |
How to use the Data Storage Converter
- 1 Enter the amount of data, such as a file size or drive capacity.
- 2 Choose the starting unit, for example TB.
- 3 Choose the target unit, for example GiB, to see what your operating system will report.
Decimal and binary units
There are two families of data units, and mixing them up causes most storage confusion:
- Decimal (SI) units – kilobyte (KB) = 1,000 bytes, megabyte (MB) = 1,000 KB, gigabyte (GB) = 1,000 MB, terabyte (TB) = 1,000 GB, petabyte (PB) = 1,000 TB.
- Binary (IEC) units – kibibyte (KiB) = 1,024 bytes, mebibyte (MiB) = 1,024 KiB, gibibyte (GiB) = 1,024 MiB, tebibyte (TiB) = 1,024 GiB.
Drive and memory-card manufacturers use decimal units. Windows reports sizes in binary units but labels them KB, MB and GB, while macOS and most Linux tools use decimal units.
Why does my 1 TB drive show 931 GB?
A 1 TB drive holds 1,000,000,000,000 bytes. Divided by 1,073,741,824 bytes per GiB, that is 931.3 GiB, which Windows displays as “931 GB”. No space is missing; the same amount is expressed in a different unit. The gap grows with size: about 2.4% for kilobytes, 7% for gigabytes and 10% for terabytes.
Bits and bytes
A byte is 8 bits. Storage is measured in bytes (capital B), while internet and network speeds are measured in bits per second (lower-case b, as in Mbps). A 100 MB file is 800 megabits. For transfer speeds, use the internet speed category of the unit converter or the download time calculator.
Typical file sizes
- A text email: a few kilobytes
- A smartphone photo: 2–5 MB
- One minute of 4K video: around 350–400 MB, depending on the codec
- A modern video game: 50–150 GB
To see how many files fit on a drive or how much space remains, use the storage calculator.
Sources
Conversion factors follow the SI definitions in the BIPM SI Brochure and the exact factors for US customary and imperial units in NIST Special Publication 811. Binary prefixes (KiB, MiB, GiB) are defined in IEC 80000-13; see NIST – Prefixes for binary multiples.
Frequently asked questions
How many MB are in a GB?
In decimal units there are 1,000 MB in a GB. In binary units there are 1,024 MiB in a GiB.
What is the difference between GB and GiB?
A gigabyte (GB) is 1,000,000,000 bytes; a gibibyte (GiB) is 1,073,741,824 bytes, about 7.4% more.
How many GB is 1 TB?
1 TB is 1,000 GB, or 931.32 GiB as shown by Windows.
How many bits are in a byte?
One byte is 8 bits.
How many photos fit on 64 GB?
With photos of about 4 MB, roughly 16,000 fit on 64 GB, but system files and apps also use space, so plan for fewer.
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