GB to TB Converter
Convert Gigabytes to Terabytes instantly with our free calculator
Conversion Formula
Binary System (Base 2)
1 GB = 0.0009765625 TB
TB = GB ÷ 1024
Used by operating systems like Windows, macOS, and Linux for file sizes and storage capacity.
Decimal System (Base 10)
1 GB = 0.001 TB
TB = GB ÷ 1000
Used by storage manufacturers and the International System of Units (SI) for marketing storage devices.
Conversion Examples
Example 1: Convert 512 GB to TB
Decimal: 512 GB ÷ 1000 = 0.512 TB
A 512 GB SSD is equal to 0.5 terabytes in the binary system.
Example 2: Convert 2048 GB to TB
Decimal: 2048 GB ÷ 1000 = 2.048 TB
A hard drive labeled as 2048 GB equals exactly 2 terabytes in binary.
Example 3: Convert 750 GB to TB
Decimal: 750 GB ÷ 1000 = 0.75 TB
A 750 GB backup drive is approximately 0.73 TB in binary notation.
GB to TB Conversion Table
| Gigabytes (GB) | Terabytes (TB) Binary |
Terabytes (TB) Decimal |
|---|---|---|
| 1 GB | 0.0009765625 TB | 0.001 TB |
| 5 GB | 0.0048828125 TB | 0.005 TB |
| 10 GB | 0.009765625 TB | 0.01 TB |
| 25 GB | 0.0244140625 TB | 0.025 TB |
| 50 GB | 0.048828125 TB | 0.05 TB |
| 100 GB | 0.09765625 TB | 0.1 TB |
| 128 GB | 0.125 TB | 0.128 TB |
| 256 GB | 0.25 TB | 0.256 TB |
| 500 GB | 0.48828125 TB | 0.5 TB |
| 512 GB | 0.5 TB | 0.512 TB |
| 750 GB | 0.732421875 TB | 0.75 TB |
| 1000 GB | 0.9765625 TB | 1 TB |
| 1024 GB | 1 TB | 1.024 TB |
| 2000 GB | 1.953125 TB | 2 TB |
| 2048 GB | 2 TB | 2.048 TB |
| 3000 GB | 2.9296875 TB | 3 TB |
| 4096 GB | 4 TB | 4.096 TB |
| 5000 GB | 4.8828125 TB | 5 TB |
| 8192 GB | 8 TB | 8.192 TB |
| 10000 GB | 9.765625 TB | 10 TB |
Popular Conversions
USB Flash Drives
- 32 GB = 0.03125 TB
- 64 GB = 0.0625 TB
- 128 GB = 0.125 TB
- 256 GB = 0.25 TB
SSD Storage
- 256 GB = 0.25 TB
- 512 GB = 0.5 TB
- 1024 GB = 1 TB
- 2048 GB = 2 TB
Hard Disk Drives
- 500 GB = 0.488 TB
- 1000 GB = 0.977 TB
- 2000 GB = 1.953 TB
- 4000 GB = 3.906 TB
What is a Gigabyte (GB)?
A gigabyte is a unit of digital information storage commonly used to measure file sizes, memory capacity, and storage space. The term “giga” derives from the Greek word meaning “giant.”
Binary Definition
1 GB = 1,073,741,824 bytes
Equal to 230 bytes or 10243 bytes. This is the definition used by computer operating systems and programming.
Decimal Definition
1 GB = 1,000,000,000 bytes
Equal to 109 bytes or 10003 bytes. This is the definition used by storage manufacturers following SI standards.
Common Uses of Gigabytes
- Smartphone storage capacity (64 GB, 128 GB, 256 GB)
- Computer RAM (8 GB, 16 GB, 32 GB)
- Digital camera memory cards
- Movie file sizes (HD movies are typically 4-8 GB)
- Mobile data plans (monthly data allowances)
- Video game installation sizes
What is a Terabyte (TB)?
A terabyte is a larger unit of digital information storage, equal to 1024 gigabytes in binary or 1000 gigabytes in decimal. The prefix “tera” comes from the Greek word meaning “monster.”
Binary Definition
1 TB = 1,099,511,627,776 bytes
Equal to 240 bytes or 10244 bytes. Used by operating systems for reporting storage capacity.
Decimal Definition
1 TB = 1,000,000,000,000 bytes
Equal to 1012 bytes or 10004 bytes. Used by manufacturers on product specifications and packaging.
Common Uses of Terabytes
- External hard drives (1 TB, 2 TB, 4 TB, 8 TB)
- Internal computer hard drives and SSDs
- Network-attached storage (NAS) systems
- Cloud storage subscriptions
- Video surveillance systems
- Media server storage for movies and music collections
- Professional video editing workstations
Why Two Different Conversion Methods?
The existence of binary and decimal conversion methods stems from different industry practices and historical developments in computing.
This difference explains why a 1 TB hard drive shows as approximately 931 GB in Windows. The manufacturer uses decimal (1,000,000,000,000 bytes), while Windows uses binary (1 TB = 1,099,511,627,776 bytes).
GB vs TB Comparison
| Aspect | Gigabyte (GB) | Terabyte (TB) |
|---|---|---|
| Symbol | GB | TB |
| Binary Value | 230 bytes | 240 bytes |
| Decimal Value | 109 bytes | 1012 bytes |
| Binary Bytes | 1,073,741,824 bytes | 1,099,511,627,776 bytes |
| Decimal Bytes | 1,000,000,000 bytes | 1,000,000,000,000 bytes |
| Size Relationship | Smaller unit | 1024 times larger (binary) |
| Typical Use Cases | USB drives, RAM, photos | Hard drives, servers, backups |
Related Storage Conversions
Smaller Units
- GB to MB (Megabytes)
- GB to KB (Kilobytes)
- GB to Bytes
- GB to Bits
- GB to Gibibytes (GiB)
Larger Units
- GB to PB (Petabytes)
- GB to EB (Exabytes)
- GB to ZB (Zettabytes)
- GB to Tebibytes (TiB)
Reverse Conversions
- TB to GB
- MB to GB
- KB to GB
- Bytes to GB
- PB to GB
Storage Size Perspective
What Can You Store in 1 TB?
- Photos: Approximately 250,000 photos at 12 megapixels (4 MB each)
- Music: About 200,000 songs in MP3 format (5 MB each)
- Movies: Around 500 hours of HD video or 250 movies (4 GB each)
- Documents: Over 6.5 million document pages
- 4K Video: Approximately 40 hours of 4K video footage
- Games: Between 10-20 modern video games (50-100 GB each)
Real-World Storage Examples
Personal Use
A laptop with 256 GB (0.25 TB) SSD can store the operating system, applications, and several thousand photos with documents.
Professional Use
A photographer might need 2-4 TB to store RAW photo collections from multiple projects and client sessions.
Media Server
A home media server with 8 TB can store extensive movie collections, TV series, and music libraries for the whole family.
Frequently Asked Questions
How many GB are in 1 TB?
There are 1024 GB in 1 TB when using the binary system (used by operating systems), or 1000 GB in 1 TB when using the decimal system (used by manufacturers). The binary calculation is: 1 TB = 1024 GB = 210 GB.
Why does my 1 TB hard drive show as 931 GB?
This occurs because manufacturers use the decimal system (1 TB = 1,000,000,000,000 bytes), while your operating system uses the binary system (1 TB = 1,099,511,627,776 bytes). When the OS divides the manufacturer’s 1 trillion bytes by 1024³, it shows approximately 931 GB.
Which conversion method should I use?
Use binary (1024) when working with operating systems, computer memory, and technical specifications. Use decimal (1000) when referring to manufacturer specifications or following SI standards. For most practical purposes, the binary method is more accurate for computer storage.
Is 500 GB half a terabyte?
In the binary system, 512 GB equals exactly 0.5 TB. However, 500 GB equals approximately 0.488 TB in binary. In the decimal system, 500 GB = 0.5 TB exactly.
How do I convert 2000 GB to TB?
Binary: 2000 GB ÷ 1024 = 1.953125 TB. Decimal: 2000 GB ÷ 1000 = 2 TB. The difference depends on which conversion standard you’re using.
What’s bigger: 1024 GB or 1 TB?
They’re equal in the binary system. 1024 GB = 1 TB when using the binary (base 2) conversion standard used by operating systems.
How much storage do I need?
For basic use (documents, browsing): 128-256 GB (0.125-0.25 TB). For moderate use (photos, some videos): 512 GB-1 TB. For heavy use (gaming, video editing, large media libraries): 2 TB or more. Cloud storage can supplement physical storage needs.
Can I convert TB back to GB?
Yes! To convert TB to GB, multiply by 1024 (binary) or 1000 (decimal). For example: 2 TB × 1024 = 2048 GB (binary), or 2 TB × 1000 = 2000 GB (decimal).
What comes after terabyte?
The next units in ascending order are: Petabyte (PB) = 1024 TB, Exabyte (EB) = 1024 PB, Zettabyte (ZB) = 1024 EB, and Yottabyte (YB) = 1024 ZB. These larger units are primarily used in enterprise computing and data centers.
Is SSD or HDD better for large storage?
SSDs are faster, more durable, and energy-efficient but more expensive per GB. HDDs offer larger capacities (up to 20 TB) at lower costs, making them ideal for bulk storage. Many users combine both: SSD for operating system and frequently used programs (256-512 GB), HDD for mass storage (2-4 TB).
Storage Technology Evolution
The progression from gigabytes to terabytes reflects the exponential growth in digital storage needs and technological capabilities over the past decades.