GB to TB formula
To convert gigabytes to terabytes, multiply the number of gigabytes by 0.001. In symbols: TB = GB × 0.001.
One gigabyte equals 0.001 terabytes, and one terabyte equals 1,000 gigabytes. Decimal prefixes make 1 TB exactly 1,000 GB, so 1 GB is exactly 0.001 TB. Binary tebibytes (TiB) differ by about 10 percent.
Worked example
Suppose you have 512 gigabytes and need the answer in terabytes.
- Write the formula: TB = GB × 0.001.
- Put in the number: 512 × 0.001 = 0.512.
- Round to suit the job. 0.512 TB is accurate enough for most everyday uses.
So 512 GB is 0.512 TB. To check, convert back: 0.512 TB is 512 GB.
Common gigabytes to terabytes values
| gigabytes (GB) | terabytes (TB) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
Reference points
Some familiar amounts in gigabytes, converted to terabytes:
- 256 GB, a laptop SSD: 0.256 TB
- 512 GB, a common upgrade tier: 0.512 TB
- 1,000 GB, one terabyte: 1 TB
- 4,000 GB, a large photo archive: 4 TB
Where you will use it
Cloud storage tiers, backup disks and video archives jump from gigabytes to terabytes as they grow. Converting tells you when a library has outgrown its drive.
Quick mental math
Move the decimal point three places left. 512 GB is a little over half a terabyte.
Going the other way
Need the reverse? Use the TB to GB converter. For comparison, 1 TB is 1,000 GB. To compare every data size unit at once, open the data size converter.
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