Formula: Decimal: GB = TB × 1000 | Binary: GiB = TiB × 1024.
TB to GB conversion — beyond the numbers
Terabytes (TB) and Gigabytes (GB) are fundamental units in digital storage, yet confusion persists due to dual standards. Whether you're buying an external drive, estimating server capacity, or planning cloud migration, knowing the difference saves both money and disappointment.
📀 What is a Terabyte (TB)?
A terabyte represents one trillion bytes in the decimal system. In computing, it's often used to describe massive storage capacities: data centers, NAS devices, and high-end laptops. Two competing definitions exist:
- Decimal (SI): 1 TB = 1,000,000,000,000 bytes = 1,000 GB. Used by storage vendors (Seagate, WD, Samsung).
- Binary (IEC): 1 TiB = 1,099,511,627,776 bytes = 1,024 GiB. Used by operating systems like Windows, Linux, and macOS file explorers.
🎯 Real-world TB to GB examples
- 1 TB External HDD: Advertised 1 TB = 1,000 GB decimal, but Windows reports ≈931 GiB (binary).
- Data center: 10 TB RAID array = 10,000 GB (vendor) but usable capacity near 9.09 TiB.
- Cloud storage plan: Google One's 2 TB = 2,000 GB decimal (cloud providers use SI).
- 4K video editing: 8 TB project ≈ 8,000 GB (decimal) or 7,812 GiB.
⚖️ Why the discrepancy? Historical & marketing context
The binary system (powers of 2) is natural for computers — 1 KiB = 1024 bytes, 1 MiB = 1024 KiB, etc. However, the SI decimal system (powers of 10) offers simpler marketing numbers. A "1 TB" drive sounds larger than 0.909 TiB, hence manufacturers adopted decimal. The result: your 4 TB NAS shows about 3.64 TB in Windows Explorer — normal and expected.
📊 Quick TB to GB reference table
| Terabytes (TB) | Gigabytes (GB) - Decimal | Gibibytes (GiB) - Binary |
|---|---|---|
| 0.1 TB | 100 GB | 102.4 GiB |
| 0.5 TB | 500 GB | 512 GiB |
| 1 TB | 1,000 GB | 1,024 GiB |
| 2 TB | 2,000 GB | 2,048 GiB |
| 4 TB | 4,000 GB | 4,096 GiB |
| 5 TB | 5,000 GB | 5,120 GiB |
| 8 TB | 8,000 GB | 8,192 GiB |
| 10 TB | 10,000 GB | 10,240 GiB |
| 12 TB | 12,000 GB | 12,288 GiB |
| 20 TB | 20,000 GB | 20,480 GiB |
💾 Practical Applications: Where TB to GB matters most
- Backup planning: If you need 5 TB backup = 5,000 GB decimal. Ensure NAS/drive labels match expectation.
- Data transfer cost: Cloud egress pricing per GB — transferring 1 TB costs based on 1000 GB (not 1024).
- Video surveillance: 2 TB storage ≈ 2000 GB, recording 30 days HD footage.
- Game libraries: Modern games 50–150 GB each; 2 TB drive holds ~15-20 titles (binary interpretation).
🧠 Pro tip for storage buyers (the 7% rule)
🔍 Always remember: usable binary capacity ≈ decimal capacity × 0.9313
Example: 2 TB drive → 2,000 GB × 0.9313 ≈ 1,862 GiB visible in Windows. Not a defect — it's the decimal vs binary difference.
❓ Frequently Asked Questions (TB to GB)
Q: How many GB are in 1 TB exactly?
A: In decimal (SI): 1 TB = 1,000 GB. In binary: 1 TiB = 1,024 GiB (often labeled as TB).
Q: Why does my 1 TB hard drive show 931 GB?
A: OS uses binary (1 GiB = 1024 MiB). 1,000,000,000,000 bytes ÷ 1,073,741,824 ≈ 931 GiB. Normal behavior.
Q: Is 1024 GB equal to 1 TB?
A: Yes for binary. For decimal (manufacturer), 1 TB = 1000 GB. Always check context.
Q: How to convert TB to GB in head?
A: Multiply by 1000 (decimal) or multiply by 1024 (binary). Our tool does both instantly.
Q: What's bigger: TB or GB?
A: Terabyte is larger: 1 TB = 1,000 GB (decimal). Perfect for big data.
🌍 Localization & global usage (language-ready)
This tool supports 10+ languages via the footer menu. Whether you're in India (हिन्दी), Germany (Deutsch), or France (Français), the conversion logic remains identical — but the educational content adapts culturally. All hreflang tags ensure SEO targeting.
Additional note for professionals: In enterprise environments (AWS, Azure, Google Cloud), billing often uses binary Gibibytes (GiB) but displays as GB. Our converter bridges that gap.
📈 Future of storage: beyond terabytes
As data scales, Petabytes (PB) and Exabytes (EB) become relevant. 1 PB = 1,000 TB (decimal) or 1,024 TiB (binary). Use our TB to GB converter as a foundation for larger calculations. Bookmark this tool for all your data planning needs.