Data Storage converter
Gigabytes to Terabytes
Converting Gigabytes to Terabytes is a single multiplication when you know the factor. One GB equals 0.001 TB, so multiply the value in GB by 0.001. The calculator below works in both directions and accepts decimals.
Formula 1 GB = 0.001 TB
Need the other direction? Terabytes to Gigabytes.
How to convert Gigabytes to Terabytes
A decimal gigabyte is 10^9 bytes; a gibibyte is 2^30 bytes. A decimal terabyte is 10^12 bytes; a tebibyte is 2^40 bytes, about 9.95% more.
To convert Gigabytes to Terabytes, multiply the value in GB by 0.001. For example, 10 GB × 0.001 = 0.01 TB. This works because the ratio between the two units is constant for every value in data storage.
Worked examples
| GB | TB |
|---|---|
| 1 GB | 0.001 TB |
| 2.5 GB | 0.0025 TB |
| 5 GB | 0.005 TB |
| 10 GB | 0.01 TB |
| 25 GB | 0.025 TB |
| 50 GB | 0.05 TB |
| 100 GB | 0.1 TB |
Reverse conversion
| TB | GB |
|---|---|
| 1 TB | 1,000 GB |
| 5 TB | 5,000 GB |
| 10 TB | 10,000 GB |
| 25 TB | 25,000 GB |
| 50 TB | 50,000 GB |
| 100 TB | 100,000 GB |
When this conversion is useful
This is the calculation you need when you are sizing a backup, a download or a storage plan and the units are mixed. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 GB is 1 TB.
Is the conversion exact?
It depends on the definition. This converter uses decimal units (1 kB = 1,000 bytes) and a bit-based base; binary units such as KiB and GiB are separate units in the list.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
GB to TB conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| 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 |
| 7 GB | 0.007 TB |
| 8 GB | 0.008 TB |
| 9 GB | 0.009 TB |
| 10 GB | 0.01 TB |
| 11 GB | 0.011 TB |
| 12 GB | 0.012 TB |
| 13 GB | 0.013 TB |
| 14 GB | 0.014 TB |
| 15 GB | 0.015 TB |
| 16 GB | 0.016 TB |
| 17 GB | 0.017 TB |
| 18 GB | 0.018 TB |
| 19 GB | 0.019 TB |
| 20 GB | 0.02 TB |
| 21 GB | 0.021 TB |
| 22 GB | 0.022 TB |
| 23 GB | 0.023 TB |
| 24 GB | 0.024 TB |
| 25 GB | 0.025 TB |
| 26 GB | 0.026 TB |
| 27 GB | 0.027 TB |
| 28 GB | 0.028 TB |
| 29 GB | 0.029 TB |
| 30 GB | 0.03 TB |
| 31 GB | 0.031 TB |
| 32 GB | 0.032 TB |
| 33 GB | 0.033 TB |
| 34 GB | 0.034 TB |
| 35 GB | 0.035 TB |
| 36 GB | 0.036 TB |
| 37 GB | 0.037 TB |
| 38 GB | 0.038 TB |
| 39 GB | 0.039 TB |
| 40 GB | 0.04 TB |
| 41 GB | 0.041 TB |
| 42 GB | 0.042 TB |
| 43 GB | 0.043 TB |
| 44 GB | 0.044 TB |
| 45 GB | 0.045 TB |
| 46 GB | 0.046 TB |
| 47 GB | 0.047 TB |
| 48 GB | 0.048 TB |
| 49 GB | 0.049 TB |
| 50 GB | 0.05 TB |
| 60 GB | 0.06 TB |
| 70 GB | 0.07 TB |
| 80 GB | 0.08 TB |
| 90 GB | 0.09 TB |
| 100 GB | 0.1 TB |
Frequently asked questions
How many Terabytes are in 1 Gigabytes?
1 GB equals 0.001 TB.
How do I convert Gigabytes to Terabytes?
Multiply the GB value by 0.001. Example: 25 GB = 0.025 TB.
What is 2.5 GB in TB?
2.5 GB = 0.0025 TB.
Is the GB to TB conversion exact?
It depends on the definition. This converter uses decimal units (1 kB = 1,000 bytes) and a bit-based base; binary units such as KiB and GiB are separate units in the list.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.