GB to TB Converter
Convert gigabytes to terabytes — 1,000 GB to the terabyte in the decimal units storage is sold in. Results update as you type; exact factors shown.
One gigabyte (10⁹) is 0.001 terabyte (10¹²) — see the exact factor, not a rounded rule of thumb.
How the gb to tb converter works
Storage converts through the byte (8 bits). Drive makers and network speeds use decimal prefixes (1 GB = 10⁹ bytes); operating systems often report binary units (1 GiB = 2³⁰ = 1,073,741,824 bytes) — sometimes labelled "GB". The gap is 7.4% at the gigabyte and 10% at the terabyte.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common data conversions
| From | To | Units |
|---|---|---|
| 100 GB | 0.1 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 250 GB | 0.25 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 500 GB | 0.5 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 1,000 GB | 1 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 2,000 GB | 2 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 4,000 GB | 4 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 8,000 GB | 8 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 10,000 GB | 10 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 12,000 GB | 12 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 16,000 GB | 16 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 20,000 GB | 20 TB | gigabyte (10⁹) to terabyte (10¹²) |
| 100,000 GB | 100 TB | gigabyte (10⁹) to terabyte (10¹²) |
Units in this converter and their exact factors
| Unit | Symbol | One unit in bytes |
|---|---|---|
| bit | bit | 0.125 byte |
| byte | B | 1 byte |
| kilobyte (10³) | kB | 1,000 byte |
| megabyte (10⁶) | MB | 1,000,000 byte |
| gigabyte (10⁹) | GB | 1,000,000,000 byte |
| terabyte (10¹²) | TB | 1,000,000,000,000 byte |
| kibibyte (2¹⁰) | KiB | 1,024 byte |
| mebibyte (2²⁰) | MiB | 1,048,576 byte |
| gibibyte (2³⁰) | GiB | 1,073,741,824 byte |
| tebibyte (2⁴⁰) | TiB | 1,099,511,627,776 byte |
FAQFrequently asked questions about data conversion
How many GB in a TB?
1,000 GB decimal, or 1,024 GiB binary.
How much is a terabyte in practice?
Roughly 250,000 photos, or about 40 hours of 4K video at 60 Mbps.
Why is my 4 TB drive smaller than 4 TB?
The operating system reports binary units — 4 TB decimal is 3.64 TiB.
How long to transfer a terabyte?
About two and a half hours on a saturated gigabit link; see the data transfer time calculator.
Should I plan storage in decimal or binary?
Buy in decimal, since that is what is sold, but size filesystems in binary, since that is what they report.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.