GB to TB Converter

Use this converter to easily convert between GigaBytes and TeraBytes.

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How many GigaBytes in a TeraByte?

There are 1024 gigabytes in a terabyte if you ask RAM manufacturers and 1000 GB in one TB if you ask disk drive manufacturers. You should keep this in mind when converting from GB to TB and make sure you are using the appropriate standard for your case.

But why is that? This happens due to there being two conventions, each defining a "terabyte" (TB) in a different manner. The standard binary convention works with powers of 2 and according to it 1 TB = 1,024 GB and this is what is shown in your operating system, for example Windows systems. The decimal convention adopted by the International System of Units defines 1 TB = 1,000 GB, following units for length and weight in which giga and tera are defined as powers of ten. This is useful when doing the calculations manually, but is not useful in that due to their binary nature, digital data is stored in 8, 16, 32, 64, 128, 256, 512, 1024, 2048 etc. pieces.

Attempting to get out of a confusing situation, in which an already widely adopted metric was redefined in standard, the IEC proposed a different unit: TibiByte (symbol: TiB), which equals 1024 GibiBytes (GiB). However, this unit never caught traction even decades after its proposal and despite adoption by the likes of the ISO, IEEE, NIST, and the EU. Most users and even most developers have never heard of the unit or are not using it in daily work.

Following a lawsuit against Western Digital, one of the most prominent hard disk manufacturers, many manufacturers now list both the SI unit, e.g. 4 TB, and the binary unit, for example 3.63 TiB or its equivalent in GiB (GibiByte), MiB (MibiByte) or KiB (KibiByte). The last three are again creations of the IEC. You should take this into account when planning the purchase of an HDD, SSD or a USB stick (thumb drive).

A 4 TB disk as seen by the Windows operating system (only 3.63 TB big):

windows disk size

Difference between GB and TB

Both units measure data quantities, with GB being significantly smaller than the TB. Both are used mostly when discussing disk drives, e.g. a 1 TB, 2 TB, 4 TB, 8 TB drives, or a 256 GB, 512 GB or 1024 GB SSD drive. As noted above, caution should be used when converting from SI TB to SI GB and from binary TB to binary GB. The gigabyte is used for large files, e.g. HD or Ultra HD video, games, HI-Fi Audio files.

How to convert GigaBytes to TeraBytes

To convert from GB to TB you need to divide by 1,024 if using binary GB and TB, or by 1,000 if using the SI standard. The division by 1,000 is easier to do by hand as you can just shift the decimal point 3 places to the left. Still, using a converter like the above makes the calculation much easier.

GB to TB conversion example

Sample task: convert 2048 gigabytes to terabytes (binary, also GiB to TiB). Solution:

Formula:
GB / 1024 = TB
Calculation:
2048 GB / 1,024 = 2 TB
End result:
2048 GB is equal to 2 TB


Sample task: convert 2000 gigabytes to terabytes (SI). Solution:

Formula:
GB / 1000 = TB
Calculation:
2000 GB / 1,000 = 2 TB
End result:
2000 GB is equal to 2 TB

GB to TB conversion table

GB (binary, also GiB) to TB (binary, also TiB) conversion table
GB (binary, also GiB) TB (binary, also TiB)
4 GB 0.003906 TB
8 GB 0.007813 TB
16 GB 0.015625 TB
32 GB 0.031250 TB
64 GB 0.062500 TB
128 GB 0.125000 TB
256 GB 0.25 TB
512 GB 0.50 TB
1,024 GB 1 TB
2,048 GB 2 TB
4,096 GB 4 TB
8,192 GB 8 TB
16,384 GB 16 TB
32,768 GB 32 TB
65,536 GB 64 TB
131,072 GB 128 TB
262,144 GB 256 TB
524,288 GB 512 TB
GB (SI) to TB (SI) conversion table
GB (SI) TB (SI)
4 GB 0.004000 TB
8 GB 0.008000 TB
16 GB 0.016000 TB
32 GB 0.032000 TB
64 GB 0.064000 TB
128 GB 0.128000 TB
256 GB 0.256000 TB
512 GB 0.512000 TB
1,024 GB 1.024000 TB
2,048 GB 2.048000 TB
4,096 GB 4.096000 TB
8,192 GB 8.192000 TB
16,384 GB 16.384000 TB
32,768 GB 32.768000 TB
65,536 GB 65.536000 TB
131,072 GB 131.072000 TB
262,144 GB 262.144000 TB
524,288 GB 524.288000 TB

References:

[1] IEC 60027-2, Second edition, 2000-11, Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics.

[2] IEC 80000-13:2008, Quantities and units, Part 13: Information science and technology

Cite this converter & page

If you'd like to cite this online converter resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "GigaBytes to TeraBytes (GB to TB) Converter", [online] Available at: https://www.gigacalculator.com/converters/convert-gb-to-tb.php URL [Accessed Date: 06 Dec, 2019].