Terabyte (TB)

Definition

One trillion bytes (10¹² B) in the decimal convention.

History

The terabyte, a trillion bytes, became an everyday size as hard drives grew through the 2000s. As with smaller units, the decimal value differs from the binary tebibyte.

Where it is used

Terabytes measure hard drives, large media libraries and backups.

Typical uses include hard drives, backups.

Conversion pages

These pages convert terabyte to or from another unit in digital storage.

• Gigabyte to terabyte

Other Digital storage units

• Byte (B)
• Bit (bit)
• Kilobyte (kB)
• Megabyte (MB)
• Gigabyte (GB)
• Gibibyte (GiB)
• Mebibyte (MiB)
• Tebibyte (TiB)

Sources

• IEC 80000-13 IEC 80000-13 (quantities and units — information science); NIST on binary prefixes · Dataset reviewed Nov 11, 2026