GB to TB Converter
Convert gigabytes to terabytes instantly. One gigabyte equals exactly 0.001 terabytes. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert gigabytes to terabytes
Worked example: convert 12 gigabytes to terabytes. Using terabytes ← gigabytes ÷ 1,000, we get 12 × 0.001 = 0.012 TB. To check the result, convert back: 0.012 TB ÷ 0.001 = 12 GB.
Gigabytes to terabytes chart
| 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 |
| 8 GB | 0.008 TB |
| 10 GB | 0.01 TB |
| 12 GB | 0.012 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 |
| 75 GB | 0.075 TB |
| 100 GB | 0.1 TB |
| 150 GB | 0.15 TB |
| 200 GB | 0.2 TB |
| 250 GB | 0.25 TB |
| 500 GB | 0.5 TB |
| 1,000 GB | 1 TB |
Terabytes to gigabytes (reverse)
| Terabytes (TB) | Gigabytes (GB) |
|---|---|
| 1 TB | 1,000 GB |
| 2 TB | 2,000 GB |
| 5 TB | 5,000 GB |
| 10 TB | 10,000 GB |
| 20 TB | 20,000 GB |
| 50 TB | 50,000 GB |
| 100 TB | 100,000 GB |
| 250 TB | 250,000 GB |
| 500 TB | 500,000 GB |
| 1,000 TB | 1,000,000 GB |
About the gigabyte and the terabyte
A gigabyte is 1,000 megabytes in decimal; one GiB (gibibyte) is 1,073,741,824 bytes. Phone storage, RAM and mobile data plans are sold in GB.
A terabyte is 1,000 gigabytes in decimal, or 10^12 bytes. Modern external hard drives and SSDs are sold in terabytes.
One terabyte equals 1,000 gigabytes, which makes the terabyte the larger unit of the two.
Everyday sizes in gigabytes and terabytes
| Everyday example (approximate) | In gigabytes | In terabytes |
|---|---|---|
| A 3-minute MP3 song | 0.005 GB | 0.000005 TB |
| A 2-hour HD movie | 3 GB | 0.003 TB |
| A Blu-ray disc | 25 GB | 0.025 TB |
| A big video game | 100 GB | 0.1 TB |
| A laptop SSD | 512 GB | 0.512 TB |
| An external hard drive | 2,000 GB | 2 TB |
Gigabytes to terabytes FAQ
How many terabytes are in one gigabyte?
One gigabyte equals exactly 0.001 terabytes. In the other direction, one terabyte equals 1,000 gigabytes.
How do I convert gigabytes to terabytes without a calculator?
convert 12 gigabytes to terabytes. Using terabytes ← gigabytes ÷ 1,000, we get 12 × 0.001 = 0.012 TB. To check the result, convert back: 0.012 TB ÷ 0.001 = 12 GB. For a quick estimate, round the factor to 0.001. Then 12 GB is about 0.012 TB, compared with the exact 0.012 TB (an error of 0%). That is close enough for planning, but use the calculator above when the number matters.
What is a Blu-ray disc in terabytes?
A Blu-ray disc is about 25 gigabytes, which is 0.025 terabytes. Treat that as an approximate everyday figure rather than an official measurement.
Are the gigabytes and terabytes the same in every country?
Decimal GB = 10^9 bytes; binary GiB = 1,073,741,824 bytes, which is why a "500 GB" drive shows about 465 GB in Windows. Decimal TB = 10^12 bytes; binary TiB = 1,099,511,627,776 bytes.