Gigabytes to Terabytes Converter

Gigabytes to Terabytes

Convert gigabytes (GB) to terabytes (TB). Both measure digital storage, and the conversion comes up in computing, storage, internet work.

The Formula

`` terabytes = gigabytes × 0.001 gigabytes = terabytes × 1000 `

One gigabyte is 0.001 terabytes, and one terabyte is 1,000 gigabytes.

Conversion Table

Gigabytes	Terabytes
1 GB	0.001 TB
2 GB	0.002 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
500 GB	0.5 TB
1,000 GB	1 TB

The Other Direction

Terabytes	Gigabytes
1 TB	1,000 GB
2 TB	2,000 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
500 TB	500,000 GB
1,000 TB	1,000,000 GB

What Each Unit Is

Gigabytes (GB) — 1,000,000,000 bytes in decimal usage. The unit of modern storage and mobile data plans.

Terabytes (TB) — 1,000,000,000,000 bytes in decimal usage. The unit of consumer drives since the late 2000s.

A Sense of Scale

• An HD film is 4–8 GB
• A phone ships with 128–512 GB
• A 1 TB drive shows as 931 GiB in Windows
• A 4K film master is several TB

Precision

The factor 0.001 is exact by international agreement, not a rounded approximation. Any imprecision in a result comes from your input, not the conversion.

In Code

`javascript const gigabyteToTerabyte = (value) => value * 0.001; ``

Where This Conversion Comes Up

• Computing
• Storage
• Internet
• Media
• Backups

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 GB with the factor truncated at each decimal place:

Decimals kept	Factor	137 GB becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0.001	0.137	—
4	0.001	0.137	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured gigabytes to three significant figures, the answer in terabytes is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Gigabytes

The same value in every other unit this converter supports for data:

From	To	Unit
1 GB	8,000,000,000 b	Bits
1 GB	1,000,000,000 B	Bytes
1 GB	8,000,000 Kb	Kilobits
1 GB	1,000,000 KB	Kilobytes
1 GB	8,000 Mb	Megabits
1 GB	1,000 MB	Megabytes

Chaining conversions works — gigabytes to metres to feet gives the same answer as gigabytes to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.