TB to GB conversion formula
1 terabyte = 1000 gigabyte
An internationally recognized unit, defined from official SI or NIST references.
The gigabyte (GB) is 10⁹ bytes in decimal convention (the one storage marketing uses), or 2³⁰ bytes in binary units (GiB) — hence the “missing” space your USB drive always seems to have.
TB to GB conversion table
| TB | GB |
|---|---|
| 1 TB | 1000 GB |
| 2 TB | 2000 GB |
| 3 TB | 3000 GB |
| 5 TB | 5000 GB |
| 10 TB | 10000 GB |
| 20 TB | 20000 GB |
| 25 TB | 25000 GB |
| 50 TB | 50000 GB |
| 100 TB | 100000 GB |
| 250 TB | 250000 GB |
| 500 TB | 500000 GB |
| 1000 TB | 1000000 GB |
How to convert TB to GB
- Write down the value in TB you want to convert.
- Multiply it by 1000 — or use the converter above, which does it instantly.
- Read your result in GB. Done.
Frequently asked questions
How many GB is 1 TB?
Using the official conversion factor, 1 terabyte = 1000 gigabyte. The converter above handles any value instantly.
What is the formula to convert terabyte to gigabyte?
1 terabyte = 1000 gigabyte. Multiply any value in TB by this factor to get GB.
Is this TB to GB converter free?
Yes — 100% free, unlimited, with no sign-up. CalculUnits is funded by non-intrusive ads, never by paywalls.