Fidamen

Convert Gigabytes to Terabytes – Data Converter

This converter converts values between gigabytes (GB) and terabytes (TB) using standard unit definitions. By default, the conversion follows the SI (decimal) interpretation where 1 TB = 1,000 GB — the convention most storage manufacturers and data-traffic measurements use.

Storage and operating-system displays sometimes use binary prefixes (gibibyte, tebibyte) where 1 TiB = 1,024 GiB. This tool makes the decimal conversion explicit and includes guidance so you can choose the correct convention for your use case.

Updated Nov 25, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record f19896a735cb • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between gigabyte and terabyte with precision rounding.

Quick reference table

GigabyteTerabyte
1 GB0.13 TB
5 GB0.63 TB
10 GB1.25 TB
25 GB3.13 TB
50 GB6.25 TB
100 GB12.5 TB

Methodology

Decimal (SI) conversion: The International System of Units (SI) defines kilo-, mega-, giga-, tera- as powers of 10. Under this system 1 TB = 10^3 GB = 1,000 GB. This is the conversion applied by this GB → TB converter.

Binary (IEC) context: The International Electrotechnical Commission (IEC) introduced distinct binary prefixes (kibi-, mebi-, gibi-, tebi-) to denote powers of two. When working with binary-anchored systems (file systems, some OS reports, memory sizes), convert GiB ↔ TiB using factor 1,024. Consult the IEC/ISO and NIST references in the citations for authoritative details.

Key takeaways

This converter returns decimal TB values from GB input using the SI factor (1 TB = 1,000 GB).

If you need binary-accurate conversions (GiB ↔ TiB), convert using powers of 2 (1,024) or use a dedicated GiB↔TiB converter and check byte-level counts for filesystem or device reporting.

Worked examples

Example (decimal): 500 GB → 500 ÷ 1,000 = 0.5 TB.

Example (decimal): 1,000 GB → 1,000 ÷ 1,000 = 1 TB.

Binary comparison (for clarity): 1,024 GiB → 1,024 ÷ 1,024 = 1 TiB (binary).

F.A.Q.

What exact conversion does this tool perform?

This converter uses the decimal (SI) relationship: 1 terabyte (TB) = 1,000 gigabytes (GB). The calculation is TB = GB ÷ 1000.

Why do my computer and my drive show different sizes?

Drive vendors report capacity in decimal (GB = 10^9 bytes). Operating systems sometimes report in binary (GiB = 2^30 bytes) but label as GB. The difference arises because 1,000^3 bytes (decimal) is smaller than 1,024^3 bytes (binary), producing different numeric labels for the same byte count.

What are GiB and TiB and when should I use them?

GiB (gibibyte) and TiB (tebibyte) are IEC binary prefixes that unambiguously mean powers of two: 1 GiB = 2^30 bytes, 1 TiB = 2^40 bytes. Use them when working with memory sizes, low-level filesystem metrics, or any context that requires exact binary multiples.

How should I round results for reporting or provisioning?

Round according to the audience and SLA. For consumer-facing summaries, two decimal places (e.g., 0.47 TB) is common. For capacity planning or billing, preserve at least three significant digits or display both GB and TB with exact byte counts to avoid ambiguity.

Does this converter account for filesystem overhead or formatting?

No. This converter maps unit quantities only. Filesystem metadata, reserved space, compression, thin provisioning, and block-alignment reduce usable capacity; measure usable bytes on the target system to account for those effects.

How can I convert between GB and GiB (decimal vs binary)?

To approximate GiB from GB, divide by 1,000 then multiply by 1,024 where appropriate; more precisely, convert bytes first (bytes = GB × 10^9), then divide by 2^30 to get GiB. For accuracy, convert via bytes: GiB = (GB × 10^9) ÷ 2^30.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: f19896a735cb

What changed (latest)

v1.0.0 • 2025-11-25 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 25, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-25 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: c98055c4616e