TB to GB Converter

Use this converter to easily convert between TeraBytes and GigaBytes.

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    Quick navigation:
  1. How many GigaBytes equal one TeraByte?
  2. Why is my X TB disk not X TB?
  3. Difference between TB and GB
  4. How to convert TeraBytes to GigaBytes
  5. TB to GB conversion table

    How many GigaBytes equal one TeraByte?

There are two possible definitions for the TeraByte and thus two correct answers to this question. According to the binary convention 1024 gigabytes equal one terabyte, while according to the SI standard 1000 gigabytes equal 1 terabyte.

Why two definitions, you may ask. The reason is that the binary ones were defined based on computer architecture, especially memory storage and manipulation, which always happens in powers of 2, hence 1,024 = 210. It is close to 1,000, so the "kilo" prefix was adopted for the kilobyte and the megabyte, gigabyte, and terabyte soon followed, despite the discrepancy increasing even more with each subsequent metric. However, binary is convenient when dealing with memory which always comes in 64, 128, 512, 1024, 2048 etc.

The International System of Units, however, wanted to adopt decimal base units, similar to the units for length and weight: kilometers, kilograms, etc. So the SI KB, MB, GB and TB were born and competition ensued, with SI ultimately losing, even though it is adopted by many international organizations. The IEC proposed alternative metrics, the TibiByte and the GibiByte (TiB and GiB) to denote the binary TB and GB, but almost no one outside niche professional circles has heard of those so the confusion about the definition of the TeraByte continues to this day. Make sure you know what metric is used when converting from TB to GB. If using our TB to GB converter, we have an option to easily switch from one convention to another.

    Why is my X TB disk not X TB?

A common question related to disk space regards the difference between advertised disk capacity and actual disk capacity. In theory, both are the same, but in practice they are not, since capacity is advertised using SI units, but measured by most operating systems in binary units. Windows, for example, will show your brand new 4 TB disk as 3.63 TB (3,638 GB or GiB, as the SI would dictate) and the difference of about 10% is all due to the different units used.

windows disk size

Above - a 4 TB WD hard disk as seen by the Windows 10 OS. After a class-action lawsuit against Western Digital (WD) regarding this discrepancy they started noting the capacity in binary units in a small font next to the big font advertised size, so it will be listed in TiB, GiB, or MiB.

    Difference between TB and GB

Both units measure storage of digital data on devices like HDDs, SSDs, USB thumb drives (USB sticks), CD-ROMs, and DVDs. The only difference between terabytes and gigabytes is the magnitude. Modern disks are usually listed in TB due to their size, while big files and folders are usually measured in gigabytes.

    How to convert TeraBytes to GigaBytes

Converting from TB to GB is an easy task, especially if using our TB to GB converter. If not, just multiply the GB number by 1,024 to get TB in the binary convention, or by 1,000 to get the SI convention. It is one of the few advantages of the decimal system: multiplying by 1,000 is as simple as adding three zeroes or moving the decimal point three positions to the right.

TB to GB conversion example

Sample task: convert 4 terabytes to gigabytes (binary, also TiB to GiB). Solution:

TB * 1024 = GB
4 TB * 1,024 = 4,096 GB
End result:
4 TB is equal to 4,096 GB

Sample task: convert 4 terabytes to gigabytes (SI). Solution:

TB * 1000 = GB
4 TB * 1,000 = 4,000 GB
End result:
4 TB is equal to 4,000 GB

    TB to GB conversion table

TB (binary, also TiB) to GB (binary, also GiB) conversion table
TB (binary, also TiB) GB (binary, also GiB)
4 TB 4,096 GB
8 TB 8,192 GB
16 TB 16,384 GB
32 TB 32,768 GB
64 TB 65,536 GB
128 TB 131,072 GB
256 TB 262,144 GB
512 TB 524,288 GB
1,024 TB 1,048,576 GB
2,048 TB 2,097,152 GB
4,096 TB 4,194,304 GB
8,192 TB 8,388,608 GB
16,384 TB 16,777,216 GB
32,768 TB 33,554,432 GB
65,536 TB 67,108,864 GB
131,072 TB 134,217,728 GB
262,144 TB 268,435,456 GB
524,288 TB 536,870,912 GB
TB (SI) to GB (SI) conversion table
4 TB 4,000 GB
8 TB 8,000 GB
16 TB 16,000 GB
32 TB 32,000 GB
64 TB 64,000 GB
128 TB 128,000 GB
256 TB 256,000 GB
512 TB 512,000 GB
1,024 TB 1,024,000 GB
2,048 TB 2,048,000 GB
4,096 TB 4,096,000 GB
8,192 TB 8,192,000 GB
16,384 TB 16,384,000 GB
32,768 TB 32,768,000 GB
65,536 TB 65,536,000 GB
131,072 TB 131,072,000 GB
262,144 TB 262,144,000 GB
524,288 TB 524,288,000 GB


[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., "TeraBytes to GigaBytes (TB to GB) Converter", [online] Available at: https://www.gigacalculator.com/converters/convert-tb-to-gb.php URL [Accessed Date: 06 Jul, 2022].