TB to GB Storage Converter

By Suraj GiriUpdated 16 September 2026

In decimal storage units 1 TB is 1,000 GB, so multiply terabytes by 1,000 to get gigabytes. In binary units 1 TiB is 1,024 GiB.

This page converts storage from terabytes to gigabytes and leads with the decimal answer, because TB and GB carry SI prefixes, which stand strictly for powers of ten. The binary answer beside it is the count Windows File Explorer shows under the same GB label.

Going the other way? Convert GB back to TB →

How do you convert TB to GB?

TB to GB conversion multiplies by 1,000, because one terabyte is 1,000 gigabytes in the decimal prefixes; in binary units one tebibyte is 1,024 gibibytes, so the multiplier becomes 1,024.

1. Type the number of terabytes into the box at the top of the page.
2. Multiply it by 1,000, the number of gigabytes in one terabyte.
3. Read the decimal answer in GB, the reading the symbols TB and GB carry in the SI.
4. If the figure was counted in steps of 1,024, read the binary answer beside it instead: the same number multiplied by 1,024, in GiB.

Terabytes and gigabytes are two rungs of one ladder; to move between any two storage units, including the binary units, use the full storage converter.

TB to GB Conversion Table

Each row gives the decimal answer and, beside it, the binary answer for the same figure read as TiB. Every value in it is exact.

Worked Example: 2 TB to GB

The first question for this page, worked both ways. Each reading passes through bytes, which is where the two part company.

A terabyte is 1,000,000,000,000 bytes and a tebibyte is 1,099,511,627,776, so the same figure lands on two different byte counts before it is multiplied again.

Check it in reverse

Run each answer back through its own step and the starting figure returns: 2,000 GB / 1,000 = 2 TB, and 2,048 GiB / 1,024 = 2 TiB. To verify any other value, read the gigabytes back as terabytes and compare the result with the figure you started from.

Worked Examples: TB to GB

Each example gives the value first, then the working. Click a value to load it in the converter.

Every example above runs the other way too - turn each GB answer back into TB.

Where These Factors Come From

The factors and rules above are read from the knowledge base rather than typed for the page. These are the lines it holds for this pair.

• terabyte (decimal), factor to byte 1000000000000
• gigabyte (decimal), factor to byte 1000000000
• tebibyte, factor to byte 1099511627776
• gibibyte, factor to byte 1073741824
• SI Brochure (BIPM 9th edition) section 3, prefix rule The SI prefixes refer strictly to powers of 10. They should not be used to indicate powers of 2 (for example, one kilobit represents 1000 bits and not 1024 bits).
• binary prefixes, adoption The prefixes kibi (Ki), mebi (Mi), gibi (Gi) and tebi (Ti) stand for 2^10, 2^20, 2^30 and 2^40. The IEC first adopted them in 1999, as Amendment 2 to IEC 60027-2, and they are now part of IEC 80000-13.
• How this page reports a result result in the target unit, decimal (SI) reading first and binary (IEC) reading beside it where the prefixes differ; printed in full where it fits in 10 significant figures, otherwise rounded to 10

What Does '1TB = 1 Trillion Bytes' on the Box Mean?

Apple states that manufacturers of storage devices measure capacity in the decimal system, as in 1TB = 1 trillion bytes; actual formatted capacity less, and that some apps and operating systems, such as iOS 10 and earlier and OS X Leopard and earlier, report storage capacity using the binary system.

So the figure on the box is the decimal answer. A system that counts in binary shows the binary answer for the same drive, and formatting uses some of the space as well.

Frequently Asked Questions

Related Conversions

• MB to GB divides by 1,000 - change a megabyte count into gigabytes.
• KB to GB divides by 1,000,000 - change a kilobyte count into gigabytes.
• GB to MB multiplies by 1,000 - break gigabytes down into megabytes.
• GB to KB multiplies by 1,000,000 - break gigabytes down into kilobytes.
• KB to MB divides by 1,000 - change a kilobyte count into megabytes.
• MB to KB multiplies by 1,000 - break megabytes down into kilobytes.

The other storage units, including bits and the binary units, are on a single page for all the storage units.