GB to TB Converter
Convert gigabytes to terabytes for hard drives, backups, and cloud storage planning.
How It Works
Formula: GB to TB = value ÷ 1024
Example: 1000 GB = 0.976563 TB
Note: 1 terabyte equals 1024 gigabytes in the binary standard used by operating systems.
Common Uses
Quick Conversion Table
| GB | TB |
|---|---|
| 0.25 | 0.0002 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 4 | 0.0039 |
| 8 | 0.0078 |
| 16 | 0.0156 |
| 32 | 0.0313 |
| 64 | 0.0625 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 TB
Precision Guidance
For storage, round to 2 decimals. For planning, keep 3-4 decimals.
Common Mistakes
Decimal labels (1000) and binary OS readings (1024) differ. A labeled 2 TB drive shows about 1.81 TiB in Windows.
Frequently Asked Questions
What is 1000 GB in TB?
1000 GB equals 0.9766 TB using the binary standard (1 TB = 1024 GB).
How do I convert GB to TB?
Divide the gigabyte value by 1024. For example, 2048 GB ÷ 1024 = 2 TB.
Why does a 1 TB drive show 931 GB?
Drive makers use decimal (1 TB = 1000 GB), but Windows uses binary (1 TB = 1024 GB), so 1 TB shows as about 931 GiB.
Is this binary or decimal?
This uses the binary standard (1 TB = 1024 GB) used by operating systems.
Deep Dive Guide
GB to TB Conversion Guide for US Hard Drives and Cloud Storage
Convert GB to TB for US external hard drives, cloud plans, and NAS storage. Learn the 1024 binary standard and why 2 TB equals 2048 GB.
Read Full Guide →More Converters You May Like
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