How many TB are in 1 GiB?

1 GiB = 1,073,741,824 bytes. Divided by 1,000,000,000,000 = 0.001073741824 TB (decimal). As TiB it equals 1/1024 TiB ≈ 0.0009765625 TiB (binary). The TB value is the one most networking and cloud tools use.

What is the difference between TB and TiB?

A terabyte (TB) = 1,000,000,000,000 bytes (decimal, SI standard). A tebibyte (TiB) = 1,099,511,627,776 bytes (binary, IEC standard). 1 TiB is about 9.95% larger than 1 TB. The IEC introduced TiB in 1998 to eliminate ambiguity between the two conventions.

What is the difference between GiB and GB?

A gibibyte (GiB) = 2^30 = 1,073,741,824 bytes (binary). A gigabyte (GB) = 10^9 = 1,000,000,000 bytes (decimal). Windows reports storage in binary GiB but labels them "GB," which is why drives show less capacity than advertised.

Why does a 1 TB drive show fewer GiB in my OS?

Manufacturers use decimal TB (10^12 bytes), while operating systems report in binary GiB (2^30 bytes). A 1 TB drive (1,000,000,000,000 bytes) converts to 931.32 GiB, so your OS shows ~931 GiB.

How many GiB are in 1 TiB?

Exactly 1,024 GiB = 1 TiB, since both are binary units (2^10 GiB = 2^40 bytes = 1 TiB). This conversion is exact with no rounding.

Gibibytes to Terabytes Converter

Convert gibibytes (GiB) to terabytes (TB) and tebibytes (TiB), or reverse — with exact decimal and binary results side by side.

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Amount

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Results

Enter a value and click Convert to see results.

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Summary

A gibibyte (GiB) is a binary unit equal to 2^30 bytes (1,073,741,824 bytes), while a terabyte (TB) is a decimal unit equal to 10^12 bytes (1,000,000,000,000 bytes). This tool converts between the two systems, showing both the SI decimal result (TB) and the binary result (TiB = 2^40 bytes) side by side. The ~9.9% difference between TB and TiB is significant at this scale and explains why a drive labeled "1 TB" by manufacturers shows roughly 931 GiB in your operating system.

How it works

Enter a value in gibibytes (GiB) or switch the direction to start from terabytes or tebibytes.
The converter multiplies GiB by 1,073,741,824 to get the raw byte count.
It divides bytes by 1,000,000,000,000 to get the SI decimal terabyte (TB) result.
It also divides bytes by 1,099,511,627,776 to get the binary tebibyte (TiB) result.
Use the Swap button to rotate through input units.
Copy any individual result with the copy button next to it.

Use cases

Understand why a "1 TB" hard drive shows ~931 GiB in Windows or Linux.
Convert backup archive sizes reported in GiB to TB for capacity planning.
Verify cloud storage quotas when the provider uses TB but your OS reports GiB.
Calculate how many GiB fit on a 2 TB or 4 TB drive before buying.
Compare NAS volume sizes across tools that mix GiB and TB labels.
Cross-check storage allocation when provisioning virtual machine disks.

Frequently Asked Questions

Last updated: 2026-06-19 · Reviewed by Nham Vu