Gigabytes to terabytes
1 gigabyte = 0.001 terabytes
Type a value in gigabytes (GB) to get terabytes (TB) straight away. A gigabyte is smaller than a terabyte, so the number goes down. Both units belong to data storage, measured here against the byte.
1 GB = 0.001 TB
Formula
TB = GB × 0.001
One gigabyte is 0.001 terabytes, so multiply by that factor. You can also divide by 1,000, the number of gigabytes in one terabyte. Here GB is the value in gigabytes and TB is the result in terabytes.
Worked example: 64 gigabytes × 0.001 = 0.064 terabytes.
Gigabytes to terabytes table
| gigabytes (GB) | terabytes (TB) |
|---|---|
| 1 GB | 0.001 TB |
| 2 GB | 0.002 TB |
| 3 GB | 0.003 TB |
| 4 GB | 0.004 TB |
| 5 GB | 0.005 TB |
| 6 GB | 0.006 TB |
| 7 GB | 0.007 TB |
| 8 GB | 0.008 TB |
| 9 GB | 0.009 TB |
| 10 GB | 0.01 TB |
| 15 GB | 0.015 TB |
| 20 GB | 0.02 TB |
| 25 GB | 0.025 TB |
| 30 GB | 0.03 TB |
| 40 GB | 0.04 TB |
| 50 GB | 0.05 TB |
| 60 GB | 0.06 TB |
| 75 GB | 0.075 TB |
| 100 GB | 0.1 TB |
Everyday gigabytes in terabytes
| What it is | GB | TB |
|---|---|---|
| an hour of SD video (about) | 1 GB | 0.001 TB |
| a single-layer DVD | 4.7 GB | 0.0047 TB |
| a phone's base storage | 64 GB | 0.064 TB |
| a laptop SSD | 256 GB | 0.256 TB |
| 1 TB drive | 1,000 GB | 1 TB |
Quick estimate in your head
Divide by 10^3: move the decimal point 3 places left.
Watch out for
- Drive makers use decimal GB (10⁹ bytes), while Windows reports binary GiB but labels it GB. A 256 GB drive shows about 238 'GB'.
- A 1 TB drive shows as about 931 GB (really GiB) in Windows. Nothing is missing; the units differ.
About the units
Gigabyte (GB). 1,000,000,000 bytes (decimal). Phone storage and data plans are sold in GB.
Terabyte (TB). 10¹² bytes (decimal). Hard drives are sold in TB, which is why a 1 TB drive shows about 931 GiB.
Going the other way, 1 terabyte is 1,000 gigabytes.
Questions
How many terabytes are in 1 gigabyte?
1 gigabyte is 0.001 terabytes, and 1 terabyte is 1,000 gigabytes.
How do I convert gigabytes to terabytes?
Use TB = GB × 0.001. For example, 64 gigabytes × 0.001 = 0.064 terabytes.
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 1 TB drive in terabytes?
1,000 GB is 1 TB.
Source for the conversion factor: NIST: prefixes for binary multiples (IEC 80000-13).
Related conversions
- terabytes to gigabytes
- gigabytes to megabytes
- gigabytes to gibibytes
- bits to bytes
- bytes to bits
- megabytes to gigabytes