Unit converter
Gigabytes to Terabytes Converter
Scale gigabytes down to terabytes here. Using the decimal system that drive labels and broadband plans follow, one terabyte is 1,000 gigabytes, so a value in GB becomes TB by dividing by 1,000. Put in any number of gigabytes and the tool shows the equivalent terabytes, alongside a table of the figures people reach for most. The two units meet whenever capacity gets large: sizing an external hard drive or NAS, tallying how many gigabytes of game installs eat into a 2 TB SSD, or budgeting a monthly cloud backup measured in terabytes.
1 gigabyte = 0.001 terabytes
Common gigabytes to terabytes values
| Gigabytes | Terabytes |
|---|---|
| 1 GB | 0.001 TB |
| 2 GB | 0.002 TB |
| 5 GB | 0.005 TB |
| 10 GB | 0.01 TB |
| 20 GB | 0.02 TB |
| 50 GB | 0.05 TB |
| 100 GB | 0.1 TB |
How to convert
- Start from the quantity in gigabytes.
- Divide by 1,000, because one terabyte contains 1,000 gigabytes on the decimal scale.
- The result is the same data expressed in terabytes.
- To convert the other way, multiply a terabyte figure by 1,000 to recover gigabytes.
- For a fast estimate, move the decimal three places left: 750 GB reads as 0.75 TB.
terabytes = gigabytes / 1000
A decimal terabyte is one thousand gigabytes, so dividing a GB figure by 1,000 expresses it in TB. Multiplying TB by 1,000 reverses the step. The factor is a power of ten, which makes the sum a plain decimal shift rather than long division.
- GB
- the amount of data in gigabytes
- 1000
- gigabytes in one decimal terabyte
Worked example
A 500 GB photo library is 500 divided by 1,000, giving 0.5 TB. Add a 250 GB games folder and the pair total 750 GB, or 0.75 TB, which still slots comfortably inside a single 1 TB drive.
Key facts
- One decimal terabyte is 1,000 GB; one tebibyte is 1,024 GiB.
- A two-hour 4K film can occupy 15 GB or more, so a 1 TB drive holds roughly 60 of them.
- Consumer SSDs commonly ship at 500 GB, 1 TB and 2 TB, which are 0.5, 1 and 2 terabytes.
- A 4 TB backup drive advertises 4,000 GB of decimal capacity.
Tips
- Add the GB sizes of your largest folders, then divide by 1,000 to see how many terabytes of drive you actually need.
- Leave headroom of ten to twenty percent on any drive, as performance and longevity suffer when it sits near full.
Frequently asked questions
How many GB are in 1 TB?+
On the decimal scale, one terabyte is 1,000 gigabytes. The binary equivalent, a tebibyte (TiB), holds 1,024 gibibytes and is a distinct unit.
How many TB is 500 GB?+
500 GB is 0.5 TB, and 2,000 GB is 2 TB. Each step of 1,000 GB adds one whole terabyte.
Why does a 1 TB drive show as about 931 GB?+
The maker counts 1 TB as a decimal trillion bytes, while the operating system divides by 1,024 at each level and calls the result GB, landing near 931.
Is a terabyte big enough for backups?+
For most photo and document libraries, yes. Heavy video collections can pass 1 TB quickly, so check your current GB total against the drive size first.
Things to watch
- Because operating systems report storage in binary, the TB figure they display will read lower than this decimal conversion for the same hardware.
Sources
Last updated: 2026-01-01
Conversions use internationally defined factors. Provided for general use; verify critical measurements independently.