Gigabits to Terabytes
Type a value in either box to convert between gigabits and terabytes. The factor is 0.000125.
| Gigabits | Terabytes |
|---|---|
| 1 Gb | 0.000125 TB |
| 2 Gb | 0.00025 TB |
| 3 Gb | 0.000375 TB |
| 5 Gb | 0.000625 TB |
| 10 Gb | 0.00125 TB |
| 25 Gb | 0.003125 TB |
| 50 Gb | 0.00625 TB |
| 100 Gb | 0.0125 TB |
How to use
- Enter a value in the Gigabits field.
- The Terabytes figure appears immediately — no button to press.
- Typing in the Terabytes field converts back to Gigabits the same way.
- Use the reference table for the values that come up most often.
Gigabits to Terabytes formula
To convert gigabits to terabytes, multiply by 0.000125.
TB = Gb × 0.000125
Put another way, one gigabit is exactly 1/8,000 of a terabyte.
Why this factor: the gigabit and the terabyte are both defined against the byte, so dividing one definition by the other gives 0.000125 directly. Both definitions are set out in full below.
To go the other way, divide by 0.000125 — or use the Terabytes to Gigabits converter, which is the same calculation reversed.
Worked example
Start with 4 Gb. Multiply by 0.000125 to get 0.0005 TB.
4 Gb × 0.000125 = 0.0005 TB
The converter above does this for any value you type, in either direction.
What is a gigabit?
A gigabit is one billion bits, the unit of modern high-speed networking.
Definition: Exactly 1,000,000,000 bits, so exactly 125,000,000 bytes.
Where it is used: Gigabit Ethernet, fiber broadband tiers, and data-centre interconnects.
What is a terabyte?
A terabyte is one trillion bytes, the standard capacity unit for hard drives and large archives.
Definition: Exactly 1×10¹² bytes under SI prefixes. The binary tebibyte (TiB) is about 1.1×10¹² bytes.
Where it is used: Hard drive and SSD capacity, backup archives, and database sizes.
Worth knowing: A 1 TB drive reports as roughly 931 GiB in an operating system that counts in powers of two — the storage is not missing, just labelled differently.
Gigabits vs Terabytes
The gigabit and the terabyte belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many terabytes are in a gigabit?
One gigabit equals 0.000125 terabytes.
What is the formula to convert gigabits to terabytes?
Multiply the number of gigabits by 0.000125. To reverse it, divide by 0.000125 instead.
How do I convert terabytes back to gigabits?
Divide by 0.000125, which is the same as multiplying by 8000.
How many terabytes are in 10 gigabits?
10 Gb works out to 0.00125 TB.
Is there anything to watch out for with terabytes?
A 1 TB drive reports as roughly 931 GiB in an operating system that counts in powers of two — the storage is not missing, just labelled differently.
How is the gigabit defined?
Exactly 1,000,000,000 bits, so exactly 125,000,000 bytes.