How to Convert Gigabytes to Terabytes (GB to TB)
Data conversions explain why a 1 TB drive shows less space on your computer and help compare mobile plans sold in gigabytes. This guide shows how to convert gigabytes into terabytes by hand, with examples and a quick-reference table.
The conversion
To convert gigabytes to terabytes, multiply the value by 0.001. To go the other way, divide by the same number (or multiply by 1,000). For a quick estimate, multiply by about 0.001.
Terabytes = gigabytes × 0.001
Worked examples
- 3 GB = 0.003 TB
- 12.5 GB = 0.0125 TB
- 75 GB = 0.075 TB
Gigabytes to Terabytes table
| Gigabytes | Terabytes |
|---|---|
| 1 GB | 0.001 TB |
| 2 GB | 0.002 TB |
| 5 GB | 0.005 TB |
| 10 GB | 0.01 TB |
| 20 GB | 0.02 TB |
| 25 GB | 0.025 TB |
| 50 GB | 0.05 TB |
| 100 GB | 0.1 TB |
| 250 GB | 0.25 TB |
| 500 GB | 0.5 TB |
| 1,000 GB | 1 TB |
Common questions
Is GB to TB exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Terabytes to Gigabytes converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Gigabytes to Terabytes Converter or browse all data storage converters.
Run your own numbers: Gigabytes to Terabytes Converter