How do you convert terabits to gigabits?

To convert terabits (Tb) to gigabits (Gb), multiply the data size in terabits by 1,000 (gigabits = terabits × 1,000).

What is 5 terabits in gigabits?

5 terabits (5 Tb) is equal to 5,000 gigabits (5,000 Gb).

Which is larger, 1 terabit (Tb) or 1 gigabit (Gb)?

One terabit (Tb) is larger than one gigabit (Gb). Specifically, 1 Tb contains 1,000 Gb, whereas 1 Gb is 0.001 Tb.

How do I convert back from gigabits (Gb) to terabits (Tb)?

To reverse the calculation from Gb to Tb, multiply your gigabit 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).

Terabits to Gigabits Converter

Enter the data size in terabits below to convert it to gigabits.

Gigabits to Terabits (Gb → Tb)

Convert Terabits to Gigabits

Enter a value in terabits (Tb) to convert to gigabits (Gb).

Value (Tb)

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Result

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5,000gigabits

5 Tb = 5,000 Gb

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Suggested Conversions

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

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Terabit to Gigabit Conversion Table

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

Terabits (Tb)	Gigabits (Gb)
1 Tb	1,000 Gb
2 Tb	2,000 Gb
2.5 Tb	2,500 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 Terabits to Gigabits

To convert terabits to gigabits, multiply the data size by the following conversion ratio: 1,000 gigabits/terabit.

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

gigabits = terabits × 1,000

The data size in gigabits is equal to the data size in terabits multiplied by 1,000.

For example, here's how to convert 5 terabits to gigabits using the formula above.

gigabits = (5 Tb × 1,000) = 5,000 Gb

How Many Gigabits Are in a Terabit?

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

1 Tb = 1,000 Gb|1 Gb = 0.001 Tb

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

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

What Is a Terabit?

A terabit is a unit of data size equal to 125,000,000,000 bytes (B), the base unit for data size. Equal to 10¹² bits (125 GB). [1]

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

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

In practice, terabits (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 terabits in our Digital Storage Converter.

What Is a Gigabit?

A gigabit is a unit of data size equal to 125,000,000 bytes (B), the base unit for data size. Equal to 1,000,000,000 bits (125 MB). [2]

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

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

In practice, gigabits (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 gigabits in our Digital Storage Converter.

When converting data size between terabits (Tb) and gigabits (Gb), keep full floating-point precision (1 Tb = 1,000 Gb; 1 Gb = 0.001 Tb) during intermediate calculations and round only the final gigabit figure to match your instrument tolerance.

More Terabit & Gigabit Conversions

Need to calculate in the opposite direction? Use our gigabits to terabits calculator to switch your starting unit immediately. You can also explore related tools such as converting gigabits to terabits, converting megabytes to gigabytes, or converting gigabytes to terabytes.

Convert from Terabits

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Frequently Asked Questions

There are 1,000 gigabits (Gb) in 1 terabit (Tb). Conversely, 1 gigabit (Gb) is equal to 0.001 terabits (Tb).

Digital Storage Converter

Quick Info

Direct Factor: 1 terabit (Tb) equals 1,000 gigabits (Gb).
Inverse Factor: 1 gigabit (Gb) equals 0.001 terabits (Tb).
Formula: gigabits = terabits × 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

Terabit (Tb)

Equal to 10¹² bits (125 GB).

Gigabit (Gb)

Equal to 1,000,000,000 bits (125 MB).

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 — Terabits (Tb) to Gigabits (Gb)
NIST / IEC Standard
[2]
BIPM (SI Decimal Prefixes (k, M, G, T, P))·Unit Specifications: Terabit (Tb) & Gigabit (Gb)
BIPM Specification
[3]
NIST CUU (SI Prefixes & Decimal Multiples)·Conversion Factors & Mathematical Basis (Tb to Gb)
NIST CUU Reference

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