GB to TB converter
Convert gigabytes to terabytes. Divide by 1000 for the terabytes printed on drives and cloud plans, or by 1024 for binary terabytes.
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How many GB in a TB?
There are 1000 GB in a TB in the decimal units used on drive boxes, by cloud plans and by macOS. In the binary units Windows uses there are 1024 GB in a TB. So 1000 gigabytes is exactly 1 TB on the box, and 1024 GB is exactly 1 TiB.
TB = GB ÷ 1000 or TiB = GiB ÷ 1024
GB to TB examples
- 1000 GB ÷ 1000 = 1 TB, or 0.977 TB in binary.
- 2000 GB ÷ 1000 = 2 TB, or 1.95 TB in binary.
- 512 GB ÷ 1000 = 0.512 TB, about half a terabyte.
- 750 GB ÷ 1000 = 0.75 TB, or 0.73 TB in binary.
Terabyte vs gigabyte
A terabyte is 1000 times bigger than a gigabyte. A phone with 256 GB of storage holds about a quarter of a terabyte, and a 2 TB external drive holds as much as eight of those phones. At about 4 MB per photo, 1 TB holds around 250,000 photos. At 3 GB per hour of HD video it holds over 300 hours. A large game install of 100 GB takes a tenth of it.
GB to TB table for drive sizes
| Gigabytes | Terabytes (1000) | Terabytes (1024) |
|---|---|---|
| 128 GB | 0.128 TB | 0.125 TB |
| 256 GB | 0.256 TB | 0.25 TB |
| 500 GB | 0.5 TB | 0.4883 TB |
| 512 GB | 0.512 TB | 0.5 TB |
| 1000 GB | 1 TB | 0.9766 TB |
| 1024 GB | 1.024 TB | 1 TB |
| 2000 GB | 2 TB | 1.9531 TB |
| 4000 GB | 4 TB | 3.9063 TB |
| 8000 GB | 8 TB | 7.8125 TB |
| 10,000 GB | 10 TB | 9.7656 TB |
The chart image adds what Windows reports for a drive sold in decimal gigabytes. Windows divides the true byte count by 1024 at every step, so a 1000 GB drive appears as 0.909 TB, or 931 GB.
Planning storage in TB
Cloud plans and drives are sold in decimal units, so 1000 GB of photos fits a 1 TB plan on paper. In practice, leave room: file systems reserve space and a nearly full drive slows down. Keeping 10 to 20% free is a common rule. If you are adding up folders that Windows reports in GB, those numbers are binary, so switch the converter to Binary before you compare with the drive size Windows shows.
Use TB to GB for the reverse direction, or MB to GB if your sizes are smaller. The byte converter shows the same value from bits to petabytes.
Frequently asked questions
How many GB are in 1 TB?
1000 GB in decimal units and 1024 GB in binary units.
Is 1000 GB the same as 1 TB?
Yes, in the decimal units drive makers use. In binary units, 1000 GB is 0.977 TB.
Is 1024 GB 1 TB?
In binary units, yes: 1024 GiB is 1 TiB. In decimal units, 1024 GB is 1.024 TB.
Is 512 GB half a terabyte?
Almost. It is 0.512 TB in decimal units, and exactly 0.5 TB in binary units.
Which is bigger, 1 TB or 500 GB?
1 TB is twice as big as 500 GB.
How do I convert GB to TB in Excel?
Divide by 1000, for example =A2/1000, or by 1024 for binary TB.