Terabytes to Gigabytes Converter

Terabytes to Gigabytes

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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

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

A Sense of Scale

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

Precision

The factor 1000 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 terabyteToGigabyte = (value) => value * 1000; ``

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 TB with the factor truncated at each decimal place:

Decimals kept	Factor	137 TB becomes	Error
0	1000	137,000	—
1	1000	137,000	—
2	1000	137,000	—
3	1000	137,000	—
4	1000	137,000	—

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 terabytes to three significant figures, the answer in gigabytes is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Terabytes

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

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

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