Gigabytes to Terabytes (GB to TB)
Drive makers use SI decimal prefixes, where a terabyte is 10¹² bytes and a gigabyte 10⁹ bytes, so 1 TB = 1,000 GB: divide by 1,000. 2,000 GB is 2 TB. Operating systems that count in binary use 1 TiB = 1,024 GiB (IEC 80000-13; NIST, prefixes for binary multiples). This converter uses the decimal SI value.
Formula
TB = GB ÷ 1,000 (binary: TiB = GiB ÷ 1,024)
Example: 256 gigabytes = 0.256 terabytes.
Gigabytes to Terabytes chart
| gigabytes | terabytes |
|---|---|
| 100 | 0.1 |
| 128 | 0.128 |
| 250 | 0.25 |
| 256 | 0.256 |
| 500 | 0.5 |
| 512 | 0.512 |
| 750 | 0.75 |
| 931.32 | 0.93132 |
| 1,000 | 1 |
| 1,024 | 1.024 |
| 2,000 | 2 |
| 4,000 | 4 |
| 5,000 | 5 |
| 8,000 | 8 |
| 10,000 | 10 |
| 20,000 | 20 |
Good to know
Why a 1 TB drive shows 931 GB: the drive holds 1,000,000,000,000 bytes. Windows divides by 1,024³ and labels the result 'GB', giving 931.32 GiB. A 2 TB drive shows 1,862.6 and a 4 TB drive 3,725.3. Nothing is missing — it is the same number of bytes in a different unit.
Binary answer: divide GiB by 1,024 for TiB. 1,024 GiB is 1 TiB, which is 1.0995 TB — about 10% larger than a decimal terabyte at this scale.
Cloud and backup plans: 2 TB of cloud storage is 2,000 GB. Backing up 750 GB of photos uses 0.75 TB; a 256 GB phone fully backed up takes 0.256 TB.
Frequently asked questions
How many GB are in 1 TB?
1,000 GB in decimal SI units (what drive makers sell). In binary units, 1 TiB = 1,024 GiB.
Is 500 GB half a terabyte?
Yes. 500 GB is 0.5 TB in decimal units.
Why does my 1 TB drive show 931 GB?
Windows reports binary gibibytes but labels them GB. 10¹² bytes ÷ 1,073,741,824 bytes per GiB = 931.32 GiB.
Is 1,024 GB 1 TB?
1,024 GiB is exactly 1 TiB. In decimal units 1,024 GB is 1.024 TB.