TB to GB Converter

TB to GB: the quick answer

To convert TB to GB, multiply the number of terabytes by 1000 using the decimal (SI) standard, or by 1024 if you are working in binary units. So in everyday decimal terms, 1 TB equals 1000 GB, and 4 TB is 4000 GB. This TB to GB converter applies whichever standard you pick and shows the result instantly, but the rule above is enough to estimate any value. Drive makers and most marketing use the decimal 1000, while operating systems often report binary, which is the single biggest source of confusion when people ask how many GB in a TB.

A terabyte (TB) is a unit of digital information equal to 1000 gigabytes in the SI/decimal system. A gigabyte (GB) is 1000 megabytes. Because storage is sold in decimal terabytes but Windows and many tools display capacity in binary, the same drive can read as 1 TB on the box and roughly 931 GB in the operating system. A clear gb to tb converter and its reverse settle that gap by letting you switch standards on purpose rather than by accident.

The decimal-versus-binary split is the heart of the topic. In decimal (SI) units, each step up multiplies by 1000: 1 TB = 1000 GB = 1,000,000 MB. In binary units, each step multiplies by 1024, and the strictly correct names are tebibyte (TiB) and gibibyte (GiB): 1 TiB = 1024 GiB. Most people still write "TB" and "GB" loosely for both, so when you see 1024 gb in tb the writer means the binary interpretation. This converter lets you choose, so the answer matches whatever context you are in.

How to use this TB to GB converter

The tool runs in your browser, needs no signup, and updates as you type. Follow these steps:

1. Type the size in terabytes into the input field. Decimals are fine, so enter 2.5 for two and a half terabytes.
2. Choose the standard: decimal (×1000) for drive marketing, or binary (×1024) for operating-system figures.
3. Read the gigabytes result, which appears instantly.
4. To go the other way, use the reverse-direction GB to TB Converter.

There is nothing to install and no limit on how many conversions you run. The result shows at full precision and rounded, so you can grab whichever fits the job: an exact figure when planning a backup target, or a tidy number for a quick comparison. If you are unsure which standard a number uses, check the source. A drive spec sheet almost always means decimal; a Windows properties dialog almost always means binary.

For a quick gb converter to tb in the other direction, just divide by 1000 (or 1024). The tool keeps both standards one click apart so you never have to guess which factor a given figure assumed.

The TB to GB formula and a worked example

There are two formulas, one per standard. Decimal (SI), used by drive manufacturers:

GB = TB × 1000

Binary, used by many operating systems (technically TiB to GiB):

GB = TB × 1024

Suppose you have a 6 TB drive. In decimal it holds 6 × 1000 = 6000 GB, which is how it is advertised. In binary the same capacity reads as about 6 × 1000 ÷ 1.0737 ≈ 5588 GiB, which is closer to what an operating system shows after formatting. To reverse the decimal calculation, divide gigabytes by 1000: 6000 ÷ 1000 returns 6 TB. That reciprocal step is the core of any gb to tb converter workflow.

Common storage conversions and use cases

Most lookups cluster around a few drive and quota sizes, so this reference table covers the values people search for most. It works as a gb to tb converter chart too if you scan it the other way.

So 1000 gb to tb is exactly 1 TB in decimal, 2000 gb to tb is 2 TB, and 128 gb to tb is 0.128 TB. The relationship is clean in decimal, which is why drive marketing prefers it. Note that the full chain runs megabytes to gigabytes to terabytes, each step ×1000 in decimal, so 1 TB is one million MB.

The conversion shows up in more places than just buying a hard drive. A few situations where switching between terabytes and gigabytes matters in practice:

• Backup planning. When you size a backup target against the data you actually hold, you need both figures in the same standard or you will under-provision. A 4 TB drive marketed in decimal holds 4000 GB, but if your file manager reports your data in binary GiB, compare like with like first.
• Cloud storage quotas. Most cloud providers bill in decimal terabytes, so a 2 TB plan is 2000 GB of usable space. Knowing the standard stops you from thinking you have been short-changed.
• NAS and RAID arrays. Multi-drive enclosures pool capacity, and the difference between decimal and binary compounds across every drive, so a ten-bay array can appear hundreds of gigabytes smaller than the sticker total.
• Video and media libraries. Editors estimating footage often think in gigabytes per hour, then total up to terabytes for a project drive; keeping one standard throughout avoids nasty surprises mid-edit.
• Comparing two drives or plans. One vendor may quote decimal GB and another binary GiB, so converting both to the same basis is the only fair comparison.

Common mistakes when converting TB to GB

• Mixing decimal and binary. A drive sold as 1 TB (1000 GB decimal) shows as about 931 GiB in Windows. Both numbers are correct; they just use different bases.
• Assuming 1 TB is 1024 GB everywhere. By the SI standard that drive makers use, 1 TB is 1000 GB. The 1024 figure belongs to binary tebibytes and gibibytes.
• Forgetting formatting overhead. Even after the unit conversion, a formatted drive has slightly less usable space because the file system reserves some capacity.
• Confusing bits and bytes. Storage is measured in bytes (B); network speeds are in bits (b). A capital B and lowercase b differ by a factor of eight.
• Rounding the binary factor too hard. If you treat binary as ×1000 instead of ×1024 you understate capacity by about 2.4%, which matters on multi-terabyte arrays.

Tips and related converters

The single fact to internalise is that there are two standards: decimal (×1000), used by drive marketing and most websites, and binary (×1024), used by many operating systems. Decide which one your source uses before you convert, and keep the standard consistent across a whole calculation. For casual comparisons, decimal is fine; for capacity planning where every gigabyte counts, match the standard your tools report.

Working across the rest of the storage family? Flip the direction with the GB to TB Converter, step down to smaller units with the MB to GB Converter or the GB to MB Converter, and for unrelated engineering units try the Power Converter. You can browse every related tool from the Unit Converters hub.

Frequently asked questions

How many GB are in a TB? In the decimal (SI) standard used by drive makers, 1 TB equals 1000 GB. In binary units it is 1024 GiB, which is why operating systems sometimes show a smaller figure.

How do I convert TB to GB by hand? Multiply terabytes by 1000 for decimal, or by 1024 for binary. For example, 4 TB × 1000 = 4000 GB.

How many GB is 1 TB exactly? 1 TB is exactly 1000 GB in decimal and exactly 1024 GiB in binary. The decimal figure is what appears on drive packaging.

What is 1000 GB in TB? 1000 GB equals 1 TB in the decimal standard. Divide any decimal gigabyte figure by 1000 to get terabytes.

What is 1024 GB in TB? 1024 GB equals 1 TiB in binary units, or about 1.024 TB in decimal. The 1024 value signals you are working in binary.

Why does my 1 TB drive show less than 1000 GB? The drive is labelled in decimal (1000 GB) but your operating system reports in binary, so 1 TB reads as about 931 GiB. Formatting overhead trims a little more.

How many GB is 4 TB or 6 TB? In decimal, 4 TB is 4000 GB and 6 TB is 6000 GB. In binary they are 4096 and 6144 GiB respectively.

Is a terabyte 1000 or 1024 gigabytes? Both definitions exist. The SI/decimal terabyte is 1000 GB; the binary tebibyte is 1024 GiB. This converter lets you choose which one to apply.