Terabytes to gigabytes
1 terabyte = 1,000 gigabytes
Type a value in terabytes (TB) to get gigabytes (GB) straight away. A terabyte is larger than a gigabyte, so the number goes up. Both units belong to data storage, measured here against the byte.
1 TB = 1,000 GB
Formula
GB = TB × 1,000
One terabyte is 1,000 gigabytes, so multiply the terabyte value by that factor. Here TB is the value in terabytes and GB is the result in gigabytes.
Worked example: 2 terabytes × 1,000 = 2,000 gigabytes.
Terabytes to gigabytes table
| terabytes (TB) | gigabytes (GB) |
|---|---|
| 1 TB | 1,000 GB |
| 2 TB | 2,000 GB |
| 3 TB | 3,000 GB |
| 4 TB | 4,000 GB |
| 5 TB | 5,000 GB |
| 6 TB | 6,000 GB |
| 7 TB | 7,000 GB |
| 8 TB | 8,000 GB |
| 9 TB | 9,000 GB |
| 10 TB | 10,000 GB |
| 15 TB | 15,000 GB |
| 20 TB | 20,000 GB |
| 25 TB | 25,000 GB |
| 30 TB | 30,000 GB |
| 40 TB | 40,000 GB |
| 50 TB | 50,000 GB |
| 60 TB | 60,000 GB |
| 75 TB | 75,000 GB |
| 100 TB | 100,000 GB |
Everyday terabytes in gigabytes
| What it is | TB | GB |
|---|---|---|
| a common external drive | 1 TB | 1,000 GB |
| a gaming SSD | 2 TB | 2,000 GB |
| a NAS drive | 4 TB | 4,000 GB |
| a large backup drive | 8 TB | 8,000 GB |
| a data-centre HDD | 20 TB | 20,000 GB |
Quick estimate in your head
Multiply by 10^3: move the decimal point 3 places right (add 3 zeros).
Watch out for
- A 1 TB drive shows as about 931 GB (really GiB) in Windows. Nothing is missing; the units differ.
- Drive makers use decimal GB (10⁹ bytes), while Windows reports binary GiB but labels it GB. A 256 GB drive shows about 238 'GB'.
About the units
Terabyte (TB). 10¹² bytes (decimal). Hard drives are sold in TB, which is why a 1 TB drive shows about 931 GiB.
Gigabyte (GB). 1,000,000,000 bytes (decimal). Phone storage and data plans are sold in GB.
Going the other way, 1 gigabyte is 0.001 terabytes.
Questions
How many gigabytes are in 1 terabyte?
1 terabyte is 1,000 gigabytes, and 1 gigabyte is 0.001 terabytes.
How do I convert terabytes to gigabytes?
Use GB = TB × 1,000. For example, 2 terabytes × 1,000 = 2,000 gigabytes.
Why does my drive show less space than advertised?
Makers use decimal units (1 GB = 10⁹ bytes) while many operating systems count in binary (1 GiB = 2³⁰ bytes). A 1 TB drive therefore shows about 931 GiB.
How much is a data-centre HDD in gigabytes?
20 TB is 20,000 GB.
Source for the conversion factor: NIST: prefixes for binary multiples (IEC 80000-13).
Related conversions
- gigabytes to terabytes
- megabytes to gigabytes
- gigabytes to megabytes
- gigabytes to gibibytes
- gibibytes to gigabytes
- bits to bytes