There are two common ways to measure how many gigabytes (GB) are in a terabyte (TB), depending on the system used:

• Decimal system (base 10): 1 TB = 1,000 GB. This is the standard used by most storage device manufacturers and aligns with the International System of Units (SI)

• Binary system (base 2): 1 TB = 1,024 GB. This is the system used by most operating systems and computer science contexts, where units are powers of 2

In summary:

Measurement System| 1 Terabyte (TB) equals how many Gigabytes (GB)
---|---
Decimal (SI)| 1,000 GB
Binary (Computer)| 1,024 GB

Both are correct depending on context, but for technical precision and most computer uses, 1 TB is considered 1,024 GB. For marketing and hardware specifications, 1 TB is often described as 1,000 GB

. Thus, when you see a 1 TB hard drive, it may be marketed as 1,000 GB, but your computer will typically report it as about 931 GB due to this difference in measurement systems.