Formula: TB = GB / 1,000
In the decimal (SI) system, 1 terabyte equals 1,000 gigabytes. In the binary system used by operating systems, 1 tebibyte (TiB) equals 1,024 gibibytes (GiB). This is why a "1 TB" drive shows less space in your OS.
| Gigabytes | Terabytes |
|---|---|
| 1 GB | 0.001 TB |
| 100 GB | 0.1 TB |
| 250 GB | 0.25 TB |
| 500 GB | 0.5 TB |
| 1,000 GB | 1 TB |
| 2,000 GB | 2 TB |