Gigabytes to Terabytes
Convert gigabyte to terabyte instantly — type a value and read the result, with the exact formula shown.
Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools
Example
1 GB = 0.001 TB, 5 GB = 0.005 TB, 10 GB = 0.01 TB.
Common conversions: gigabyte to terabyte
Quick reference for the GB → TB values you are most likely to need, computed with the exact factor the converter above uses. It includes the specific values people most often look up (1,000 GB, 128 GB, 1,024 GB, 4,096 GB, 10 GB).
| Gigabyte (GB) | Terabyte (TB) |
|---|
| 1 GB | 0.001 TB |
| 2 GB | 0.002 TB |
| 3 GB | 0.003 TB |
| 5 GB | 0.005 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 |
| 70 GB | 0.07 TB |
| 75 GB | 0.075 TB |
| 80 GB | 0.08 TB |
| 90 GB | 0.09 TB |
| 100 GB | 0.1 TB |
| 128 GB | 0.128 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 |
| 1,024 GB | 1.024 TB |
| 2,000 GB | 2 TB |
| 4,096 GB | 4.096 TB |
| 10,000 GB | 10 TB |
Terabyte to Gigabyte
| Terabyte (TB) | Gigabyte (GB) |
|---|
| 1 TB | 1,000 GB |
| 5 TB | 5,000 GB |
| 10 TB | 10,000 GB |
| 50 TB | 50,000 GB |
| 100 TB | 100,000 GB |
How it works
Terabyte = Gigabyte × 0.001. Every value is converted through a single byte base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Converting gigabytes to terabytes comes up the moment your data outgrows a single drive: tallying a photo library across multiple SD cards, sizing a NAS or RAID array, estimating a cloud backup bill, or checking whether a year of 4K footage will fit on a 2 TB SSD. Because storage is sold and billed in terabytes but most individual files and folders are measured in gigabytes, the GB-to-TB step is what lets you compare apples to apples.
Both units are SI-based decimal multiples of the byte. A terabyte is exactly 1,000 gigabytes, just as a gigabyte is 1,000 megabytes — each step up the ladder is a clean factor of 1,000. This is the standard drive manufacturers, internet providers, and most operating systems (macOS, iOS, Android, modern Linux) use when they print capacities and data caps.
The rule of thumb is simple: shift the decimal point three places left, so 250 GB becomes 0.25 TB and 1,500 GB becomes 1.5 TB. A quick gut check — anything under 1,000 GB is still a fraction of a terabyte, and a "1 TB" plan gives you exactly 1,000 GB of headroom.
The classic mistake is mixing decimal and binary units. The decimal terabyte (TB) here is 1,000 GB, but a binary tebibyte (TiB) is 1,024 gibibytes — about 1,099 GB. That ~10% gap is why a "1 TB" drive shows up as roughly 0.91 "TB" in Windows, which actually reports TiB while labeling it TB. If your source number is in GiB, convert within the binary system rather than treating it as decimal GB.
Frequently asked questions
How do you convert gigabyte to terabyte?
Multiply the number of gigabytes by 0.001 to get terabytes. For example, 1 GB = 0.001 TB.
What is 1 gigabyte in terabytes?
1 gigabyte equals 0.001 terabytes (1 GB = 0.001 TB).
How many gigabytes are in 1 terabyte?
There are 1,000 gigabytes in 1 terabyte.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How many GB are in a TB?
In the decimal (SI) system used by drive makers and most operating systems, 1 TB = 1,000 GB. In the binary system, 1 TiB = 1,024 GiB (about 1,099 GB).
Is 500 GB half a terabyte?
Yes. 500 GB equals 0.5 TB, exactly half of a 1 TB total, since 1 TB is defined as 1,000 GB.
How many GB is a 2 TB drive?
A 2 TB drive holds 2,000 GB in decimal terms. In Windows, which reports binary units, it will display as roughly 1,818 GiB labeled as GB.
Why does my 1 TB hard drive show less than 1 TB?
The drive really holds 1,000 GB (1 trillion bytes), but Windows divides by 1,024 instead of 1,000 and still calls the result 'TB', so it shows about 0.91 TB. No space is actually missing.
How do I convert GB to TB manually?
Divide the number of gigabytes by 1,000, or simply move the decimal point three places to the left. For example, 750 GB / 1,000 = 0.75 TB.
Is 1024 GB equal to 1 TB?
Not in decimal terms — 1 TB is 1,000 GB. 1,024 GB equals 1.024 TB, or one binary tebibyte (1 TiB) if you are using binary units.
How many GB is 0.5 TB?
0.5 TB equals 500 GB, found by multiplying 0.5 by 1,000.
Is a terabyte bigger than a gigabyte?
Yes, a terabyte is 1,000 times larger than a gigabyte. One terabyte can hold the equivalent of 1,000 one-gigabyte files.
Why use TB instead of GB?
Purely for readability: once sizes pass a thousand gigabytes, writing 4 TB is clearer than 4,000 GB, just as 1 GB is easier than 1,000 MB. The information is identical because 1 TB = 1,000 GB, so any figure converts by moving the decimal point three places. Drive makers, cloud providers, and backup tools switch to terabytes at that scale so that capacities, quotas, and prices are easy to compare at a glance.
Related calculators
Sources & references
These tools follow our methodology and provide educational estimates only — verify important figures with a qualified professional.