How do you convert terabytes to gigabytes?

To convert terabytes (TB) to gigabytes (GB), multiply the data size in terabytes by 1,000 (gigabytes = terabytes × 1,000).

What is 2 terabytes in gigabytes?

2 terabytes (2 TB) is equal to 2,000 gigabytes (2,000 GB).

Which is larger, 1 terabyte (decimal) (TB) or 1 gigabyte (decimal) (GB)?

One terabyte (decimal) (TB) is larger than one gigabyte (decimal) (GB). Specifically, 1 TB contains 1,000 GB, whereas 1 GB is 0.001 TB.

How do I convert back from gigabytes (GB) to terabytes (TB)?

To reverse the calculation from GB to TB, multiply your gigabyte (decimal) value by the inverse factor 0.001 (or divide by 1,000). You can also click the Swap button in the tool above to flip directions in one click.

Are there regional or standard differences when converting TB and GB?

Decimal SI (Base-10) vs. Binary IEC (Base-2) & Bits vs. Bytes: Networking speeds and storage drive manufacturers use SI decimal prefixes (1 kB = 1,000 bytes, 1 MB = 1,000,000 bytes, 1 GB = 10⁹ bytes), whereas operating systems and RAM often report binary IEC prefixes (1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes, 1 GiB = 1,073,741,824 bytes). Also note that lowercase 'b' denotes bits while uppercase 'B' denotes Bytes (1 Byte = 8 bits).

Terabytes to Gigabytes Converter

Enter the data size in terabytes below to convert it to gigabytes.

Gigabytes to Terabytes (GB → TB)

Convert Terabytes to Gigabytes

Enter a value in terabytes (TB) to convert to gigabytes (GB).

Value (TB)

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2,000gigabytes

2 TB = 2,000 GB

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Suggested Conversions

Reference:NIST / IEC (IEC 80000-13 Binary Prefixes)

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Terabyte to Gigabyte Conversion Table

Table showing various terabyte measurements converted to gigabytes. Click any preset value or arrow to load it into the converter.

Terabytes (TB)	Gigabytes (GB)
1 TB	1,000 GB
2 TB	2,000 GB
4 TB	4,000 GB
5 TB	5,000 GB
10 TB	10,000 GB
15 TB	15,000 GB
20 TB	20,000 GB
25 TB	25,000 GB
30 TB	30,000 GB
50 TB	50,000 GB

How to Convert Terabytes to Gigabytes

To convert terabytes to gigabytes, multiply the data size by the following conversion ratio: 1,000 gigabytes/terabyte.

Since one terabyte is equal to 1,000 gigabytes, you can use this simple formula to convert:

gigabytes = terabytes × 1,000

The data size in gigabytes is equal to the data size in terabytes multiplied by 1,000.

For example, here's how to convert 2 terabytes to gigabytes using the formula above.

gigabytes = (2 TB × 1,000) = 2,000 GB

How Many Gigabytes Are in a Terabyte?

There are 1,000 gigabytes in a terabyte, which is why we use this value in the formula above.

1 TB = 1,000 GB|1 GB = 0.001 TB

Our terabyte to gigabyte calculator automatically converts your data size measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Terabytes and gigabytes are both units used to measure data size. Keep reading to learn more about each unit.

What Is a Terabyte?

A terabyte is a unit of data size equal to 1e+12 bytes (B), the base unit for data size. SI decimal standard: 1,000,000,000,000 bytes (1,000 GB). [1]

The terabyte is classified as a metric and SI-compatible unit of data size. Terabytes can be abbreviated as TB; for example, 1 terabyte can be written as 1 TB.

In the metric system, "tera" is the standard SI prefix for trillions, or 10¹². This makes the terabyte (TB) a convenient decimal multiple of the byte (B).

In practice, terabytes (TB) are widely used across large-scale industrial, bulk, and macro-level data size specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about terabytes in our Digital Storage Converter.

What Is a Gigabyte?

A gigabyte is a unit of data size equal to 1,000,000,000 bytes (B), the base unit for data size. SI decimal standard: 1,000,000,000 bytes. [2]

The gigabyte is classified as a metric and SI-compatible unit of data size. Gigabytes can be abbreviated as GB; for example, 1 gigabyte can be written as 1 GB.

In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigabyte (GB) a convenient decimal multiple of the byte (B).

In practice, gigabytes (GB) are widely used across large-scale industrial, bulk, and macro-level data size specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about gigabytes in our Digital Storage Converter.

When converting data size between terabytes (TB) and gigabytes (GB), keep full floating-point precision (1 TB = 1,000 GB; 1 GB = 0.001 TB) during intermediate calculations and round only the final gigabyte figure to match your instrument tolerance.

More Terabyte & Gigabyte Conversions

Need to calculate in the opposite direction? Use our gigabytes to terabytes converter (GB to TB) to switch your starting unit immediately. You can also explore related tools such as converting megabytes to gigabytes, converting kilobytes to gigabytes, or converting kilobytes to megabytes.

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Frequently Asked Questions

There are 1,000 gigabytes (GB) in 1 terabyte (TB). Conversely, 1 gigabyte (GB) is equal to 0.001 terabytes (TB).

Digital Storage Converter

Quick Info

Direct Factor: 1 terabyte (decimal) (TB) equals 1,000 gigabytes (GB).
Inverse Factor: 1 gigabyte (decimal) (GB) equals 0.001 terabytes (TB).
Formula: gigabytes = terabytes × 1,000.
Standard Note: Decimal SI (Base-10) vs. Binary IEC (Base-2) & Bits vs. Bytes: Networking speeds and storage drive manufacturers use SI decimal prefixes (1 kB = 1,000 bytes, 1 MB = 1,000,000 bytes, 1 GB = 10⁹ bytes), whereas operating systems and RAM often report binary IEC prefixes (1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes, 1 GiB = 1,073,741,824 bytes). Also note that lowercase 'b' denotes bits while uppercase 'B' denotes Bytes (1 Byte = 8 bits).

Units Comparison

Terabyte (Decimal) (TB)

SI decimal standard: 1,000,000,000,000 bytes (1,000 GB).

Gigabyte (Decimal) (GB)

SI decimal standard: 1,000,000,000 bytes.

Byte (B)

8 binary bits.

References

[1]NIST / IEC · IEC 80000-13 Binary Prefixes
Source
[2]BIPM · SI Decimal Prefixes (k, M, G, T, P)
Source
[3]NIST CUU · SI Prefixes & Decimal Multiples
Source

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References

NIST · BIPM · ISO

[1]
NIST / IEC (IEC 80000-13 Binary Prefixes)·Digital Storage Metrology Standard — Terabytes (TB) to Gigabytes (GB)
NIST / IEC Standard
[2]
BIPM (SI Decimal Prefixes (k, M, G, T, P))·Unit Specifications: Terabyte (Decimal) (TB) & Gigabyte (Decimal) (GB)
BIPM Specification
[3]
NIST CUU (SI Prefixes & Decimal Multiples)·Conversion Factors & Mathematical Basis (TB to GB)
NIST CUU Reference

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