How many gibibytes are in a terabyte?

1 TB = 931.3225746 GiB (rounded to 7 decimal places). The exact value is 10^12 / 2^30 = 1,000,000,000,000 / 1,073,741,824.

Why does my 1 TB drive show ~931 GiB in my OS?

Storage manufacturers measure capacity using SI terabytes (powers of 1,000). Your operating system reports sizes in gibibytes (powers of 1,024) but often labels them "GB." Because 1 GiB is larger than 1 GB, the same number of bytes produces a smaller number when expressed in GiB — about 931 instead of 1,000.

What is the difference between GB and GiB?

1 GB (gigabyte) = 1,000,000,000 bytes (SI decimal). 1 GiB (gibibyte) = 1,073,741,824 bytes (IEC binary). 1 GiB is about 7.37% larger than 1 GB.

What is the exact formula for TB to GiB?

GiB = TB × (10^12 / 2^30) = TB × 931.3225746154785. For most uses, multiplying by 931.3226 is accurate enough.

Is a tebibyte (TiB) the same as a terabyte (TB)?

No. 1 TiB = 2^40 bytes = 1,099,511,627,776 bytes, which is larger than 1 TB = 10^12 bytes = 1,000,000,000,000 bytes. This tool converts SI terabytes (TB) to binary gibibytes (GiB), not tebibytes.

Terabytes to Gibibytes Converter

Enter a terabyte (TB) value and instantly get gibibytes (GiB) — the binary unit your OS actually reports.

Input — Terabytes (TB)

Number of terabytes

Why ~931 GiB per TB? 1 TB = 10¹² bytes. 1 GiB = 2³⁰ bytes = 1,073,741,824 bytes. So 1 TB = 10¹² / 2³⁰ ≈ 931.3226 GiB.

Results

Enter a terabyte value and click Convert.

Reference Table — Common Storage Sizes

How many GiB does your OS report for a drive rated in TB?

Terabytes (TB)	Gibibytes (GiB)	Gigabytes (GB, SI)	Typical example

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Summary

This tool converts terabytes (TB) — the SI decimal unit used by storage manufacturers — into gibibytes (GiB), the IEC binary unit that operating systems use internally. Because 1 TB equals exactly 1,000,000,000,000 bytes and 1 GiB equals 1,073,741,824 bytes, the conversion factor is roughly 931.3226 GiB per TB. That gap is why a "1 TB" drive shows about 931 GiB in Windows, macOS, or Linux.

How it works

Enter the number of terabytes in the input field.
The tool divides 1,000,000,000,000 (bytes per TB) by 1,073,741,824 (bytes per GiB) to get the factor: ~931.3226.
Your TB value is multiplied by that factor to produce gibibytes.
Results appear instantly with up to 10 significant digits.
Use the Copy button to grab the GiB result.
Scroll down for a reference table covering common storage sizes.

Use cases

Find out how many GiB your OS will report for a drive rated in TB.
Plan storage quotas when your system works in GiB but hardware specs use TB.
Verify cloud storage allocations where billing is in TB but usage dashboards show GiB.
Convert backup target sizes from TB to GiB for capacity planning.
Cross-check NAS or RAID array capacity before provisioning.
Explain to users why a "2 TB" drive does not show exactly 2,000 GiB.

Frequently Asked Questions

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