TB to GB Converter
Convert terabytes to gigabytes for storage drives, cloud quotas, and data center planning.
How It Works
Formula: TB to GB = value × 1024
Example: 1 TB = 1024 GB
Note: 1 terabyte equals 1,024 gigabytes in binary units.
Common Uses
Quick Conversion Table
| TB | GB |
|---|---|
| 0.25 | 256 |
| 0.5 | 512 |
| 1 | 1024 |
| 2 | 2048 |
| 4 | 4096 |
| 8 | 8192 |
| 16 | 16384 |
| 32 | 32768 |
| 64 | 65536 |
Rounding Rule
Rounded to 0 decimal places
Error Margin
±1 GB
Precision Guidance
Use binary (1,024) for OS/cloud figures; decimal (1,000) only for marketing specs.
Common Mistakes
Binary vs decimal prefixes differ by 2.4% — significant at TB scale.
Frequently Asked Questions
How many GB are in a TB?
There are 1,024 gigabytes in a terabyte using binary (1024³) units, the standard for most storage.
Is a TB 1000 or 1024 GB?
Most OSes and drives report binary 1,024 GB; some marketing uses decimal 1,000 GB. This converter uses 1,024.
How do I convert 2 TB to GB?
Multiply 2 by 1,024: 2 TB = 2,048 GB.
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Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 kibibyte (KiB) = 1024 bytes (exact, binary, IEC)
- EXACT1 kilobyte (kB, decimal) = 1000 bytes (exact, SI)
- EXACT1 mebibyte (MiB) = 1,048,576 bytes; 1 megabyte (MB) = 1,000,000 bytes
- EXACT1 gibibyte (GiB) = 1,073,741,824 bytes; 1 gigabyte (GB) = 1,000,000,000 bytes
Common Pitfalls & How to Avoid Them
GB vs. GiB (the "missing" storage space)
Operating systems label gibibytes as "GB". A "500 GB" drive holds 500 × 10⁹ bytes = 465.66 GiB, which Windows shows as ~465 GB. The space is not "lost" — decimal vs. binary units differ.
kB vs. KB capitalization
Strictly, kB = 1000 bytes (SI) and KB is sometimes used for 1024 (binary). To avoid ambiguity use KiB/MiB/GiB for binary and kB/MB/GB for decimal.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- IEC (International Electrotechnical Commission) — IEC 80000-13 — Quantities and units for information science and technology (binary prefixes)
Last Updated 2026 | This converter was reviewed for accuracy