How do I convert Terabytes to Gigabytes?

Multiply the number of terabytes by 1000. The formula is 1 TB = 1000 GB, so 4 TB = 4000 GB.

How many GB are in one TB?

There are 1000 gigabytes in one terabyte (1 TB = 1000 GB) using the decimal SI definition that drive makers print on labels.

What is the conversion formula for TB to GB?

GB = TB × 1000. The converter applies this exact factor to any value you enter, in both directions.

Why does my 1 TB drive show as about 931 GB in my operating system?

Drive makers use decimal units (1 TB = 1000 GB), but Windows reports binary units where 1 GiB = 1024^3 bytes. 1 TB ÷ 1024^3 ≈ 931 GiB, which the OS labels as GB. This tool uses the decimal SI definition.

Is TB to GB the same as TiB to GiB?

No. TB→GB uses ×1000 (decimal). TiB→GiB also uses ×1024 but starts from binary terabytes. They differ by about 7% at the terabyte scale, which is why advertised and reported capacities don't match.

How do I convert GB back to TB?

Divide gigabytes by 1000. For example, 2500 GB ÷ 1000 = 2.5 TB. Just type into the Gigabytes field here and the Terabytes value updates.

Is anything uploaded?

No. The conversion is plain arithmetic running in your browser — no values are sent to any server.

Terabytes to Gigabytes Converter

This free digital-storage converter changes terabytes (TB) to gigabytes (GB) and back again, using the decimal SI definition that storage manufacturers print on their products. It is handy when sizing backups, comparing drive capacities, or budgeting cloud storage.

How it works

The conversion is a single fixed factor:

GB = TB × 1000
TB = GB ÷ 1000

Type a value in either field and the other updates instantly — the tool multiplies by 1000 going from TB to GB, and divides by 1000 going the other way. This is the decimal (SI) convention. Note that operating systems often report storage in binary units (1 GiB = 1024³ bytes), which is why a “1 TB” drive shows as roughly 931 GB in Windows.

Example

Convert 2.5 TB: 2.5 × 1000 = 2500 GB. Going back, 2500 GB ÷ 1000 = 2.5 TB.

Terabytes (TB)	Gigabytes (GB)
1 TB	1000 GB
2.5 TB	2500 GB
100 TB	100000 GB
1000 TB	1000000 GB

All calculations run entirely in your browser with no data sent to any server.