Convert Terabytes to Gigabytes
Terabytes to gigabytes breaks a big, round TB number back down into the more familiar GB unit — the one most plans, phones, and files are still measured in. In the decimal convention that drives are sold in, one terabyte is exactly 1000 gigabytes.
Terabytes to Gigabytes conversion table
| Terabytes (TB) | Gigabytes (GB) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
The formula
To convert terabytes to gigabytes, multiply the size in terabytes by 1000:
gigabytes = terabytes × 1000
A worked example
Say a photographer's archive drive is 6 TB and you want that in gigabytes:
6 × 1000 = 6000 GB
Same digits, decimal point shifted three places right.
Decimal vs binary — reading the number your OS shows
This conversion uses the decimal (SI) rule: 1 TB = 1000 GB, exactly how drives are advertised. Operating systems often count in binary, where a "gigabyte" is a gibibyte of 1024 mebibytes — slightly bigger than the decimal gigabyte. So the 6 TB drive above is 6000 GB on the box, but your computer, counting in powers of two, shows roughly 5588 GiB. Nothing's missing; the two systems just measure a "gigabyte" differently.
When you'll use it
Breaking a terabyte drive or plan into GB to compare against phone-sized figures, estimating how many GB-based games or projects a big drive will hold, or matching a TB capacity against a service that quotes everything in gigabytes.
Frequently asked questions
How many gigabytes are in a terabyte?
1000 in the decimal convention. To go from TB to GB you multiply by 1000.
So why does my 2 TB drive show less than 2000 GB?
Because the label is decimal (2 TB = 2000 GB) but your OS reports in binary, where a 'gigabyte' is a larger gibibyte. Counted that way, a 2 TB drive lands near 1862 GiB. The capacity is all there — it's just two different rulers.
Is the multiplication exact?
In the decimal convention, yes — just move the decimal point three places to the right.